538 lines
17 KiB
Diff
538 lines
17 KiB
Diff
From 0a63ab263725c427051a8bbaa0732b749627da27 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Thu, 7 Aug 2014 18:15:36 +0200
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Subject: [PATCH 23/36] NET: PHY: adds driver for lantiq PHY11G
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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drivers/net/phy/Kconfig | 5 +
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drivers/net/phy/Makefile | 1 +
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drivers/net/phy/lantiq.c | 231 ++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 237 insertions(+)
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create mode 100644 drivers/net/phy/lantiq.c
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--- a/drivers/net/phy/Kconfig
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+++ b/drivers/net/phy/Kconfig
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@@ -156,6 +156,11 @@ config MICROCHIP_PHY
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help
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Supports the LAN88XX PHYs.
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+config LANTIQ_PHY
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+ tristate "Driver for Lantiq PHYs"
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+ ---help---
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+ Supports the 11G and 22F PHYs.
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+
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config FIXED_PHY
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tristate "Driver for MDIO Bus/PHY emulation with fixed speed/link PHYs"
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depends on PHYLIB
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--- a/drivers/net/phy/Makefile
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+++ b/drivers/net/phy/Makefile
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@@ -30,6 +30,7 @@ obj-$(CONFIG_DP83848_PHY) += dp83848.o
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obj-$(CONFIG_DP83867_PHY) += dp83867.o
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obj-$(CONFIG_STE10XP) += ste10Xp.o
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obj-$(CONFIG_MICREL_PHY) += micrel.o
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+obj-$(CONFIG_LANTIQ_PHY) += lantiq.o
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obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
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obj-$(CONFIG_MICREL_KS8995MA) += spi_ks8995.o
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obj-$(CONFIG_AT803X_PHY) += at803x.o
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--- /dev/null
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+++ b/drivers/net/phy/lantiq.c
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@@ -0,0 +1,278 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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+ *
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+ * Copyright (C) 2012 Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/phy.h>
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+#include <linux/of.h>
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+
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+#define MII_MMDCTRL 0x0d
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+#define MII_MMDDATA 0x0e
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+
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+#define MII_VR9_11G_IMASK 0x19 /* interrupt mask */
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+#define MII_VR9_11G_ISTAT 0x1a /* interrupt status */
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+
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+#define INT_VR9_11G_WOL BIT(15) /* Wake-On-LAN */
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+#define INT_VR9_11G_ANE BIT(11) /* Auto-Neg error */
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+#define INT_VR9_11G_ANC BIT(10) /* Auto-Neg complete */
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+#define INT_VR9_11G_ADSC BIT(5) /* Link auto-downspeed detect */
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+#define INT_VR9_11G_DXMC BIT(2) /* Duplex mode change */
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+#define INT_VR9_11G_LSPC BIT(1) /* Link speed change */
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+#define INT_VR9_11G_LSTC BIT(0) /* Link state change */
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+#define INT_VR9_11G_MASK (INT_VR9_11G_LSTC | INT_VR9_11G_ADSC)
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+
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+#define ADVERTISED_MPD BIT(10) /* Multi-port device */
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+
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+#define MMD_DEVAD 0x1f
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+#define MMD_ACTYPE_SHIFT 14
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+#define MMD_ACTYPE_ADDRESS (0 << MMD_ACTYPE_SHIFT)
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+#define MMD_ACTYPE_DATA (1 << MMD_ACTYPE_SHIFT)
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+#define MMD_ACTYPE_DATA_PI (2 << MMD_ACTYPE_SHIFT)
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+#define MMD_ACTYPE_DATA_PIWR (3 << MMD_ACTYPE_SHIFT)
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+
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+static __maybe_unused int vr9_gphy_mmd_read(struct phy_device *phydev,
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+ u16 regnum)
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+{
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+ phy_write(phydev, MII_MMDCTRL, MMD_ACTYPE_ADDRESS | MMD_DEVAD);
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+ phy_write(phydev, MII_MMDDATA, regnum);
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+ phy_write(phydev, MII_MMDCTRL, MMD_ACTYPE_DATA | MMD_DEVAD);
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+
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+ return phy_read(phydev, MII_MMDDATA);
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+}
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+
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+static __maybe_unused int vr9_gphy_mmd_write(struct phy_device *phydev,
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+ u16 regnum, u16 val)
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+{
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+ phy_write(phydev, MII_MMDCTRL, MMD_ACTYPE_ADDRESS | MMD_DEVAD);
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+ phy_write(phydev, MII_MMDDATA, regnum);
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+ phy_write(phydev, MII_MMDCTRL, MMD_ACTYPE_DATA | MMD_DEVAD);
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+ phy_write(phydev, MII_MMDDATA, val);
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+
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+ return 0;
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+}
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+
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+#if IS_ENABLED(CONFIG_OF_MDIO)
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+static int vr9_gphy_of_reg_init(struct phy_device *phydev)
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+{
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+ u32 tmp;
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+
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+ /* store the led values if one was passed by the devicetree */
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,ledch", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e0, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,ledcl", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e1, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led0h", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e2, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led0l", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e3, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led1h", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e4, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led1l", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e5, tmp);
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led2h", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e6, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led2l", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e7, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led3h", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e8, tmp);
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+
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+ if (!of_property_read_u32(phydev->dev.of_node, "lantiq,led3l", &tmp))
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+ vr9_gphy_mmd_write(phydev, 0x1e9, tmp);
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+
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+ return 0;
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+}
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+#else
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+static int vr9_gphy_of_reg_init(struct phy_device *phydev)
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+{
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+ return 0;
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+}
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+#endif /* CONFIG_OF_MDIO */
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+
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+static int vr9_gphy_config_init(struct phy_device *phydev)
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+{
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+ int err;
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+
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+ dev_dbg(&phydev->dev, "%s\n", __func__);
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+
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+ /* Mask all interrupts */
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+ err = phy_write(phydev, MII_VR9_11G_IMASK, 0);
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+ if (err)
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+ return err;
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+
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+ /* Clear all pending interrupts */
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+ phy_read(phydev, MII_VR9_11G_ISTAT);
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+
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+ vr9_gphy_mmd_write(phydev, 0x1e0, 0xc0);
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+ vr9_gphy_mmd_write(phydev, 0x1e1, 0x00);
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+ vr9_gphy_mmd_write(phydev, 0x1e2, 0x70);
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+ vr9_gphy_mmd_write(phydev, 0x1e3, 0x03);
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+ vr9_gphy_mmd_write(phydev, 0x1e4, 0x70);
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+ vr9_gphy_mmd_write(phydev, 0x1e5, 0x03);
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+ vr9_gphy_mmd_write(phydev, 0x1e6, 0x70);
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+ vr9_gphy_mmd_write(phydev, 0x1e7, 0x03);
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+ vr9_gphy_mmd_write(phydev, 0x1e8, 0x70);
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+ vr9_gphy_mmd_write(phydev, 0x1e9, 0x03);
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+
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+ vr9_gphy_of_reg_init(phydev);
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+
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+ return 0;
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+}
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+
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+static int vr9_gphy_config_aneg(struct phy_device *phydev)
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+{
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+ int reg, err;
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+
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+ /* Advertise as multi-port device */
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+ reg = phy_read(phydev, MII_CTRL1000);
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+ reg |= ADVERTISED_MPD;
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+ err = phy_write(phydev, MII_CTRL1000, reg);
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+ if (err)
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+ return err;
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+
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+ return genphy_config_aneg(phydev);
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+}
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+
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+static int vr9_gphy_ack_interrupt(struct phy_device *phydev)
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+{
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+ int reg;
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+
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+ /*
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+ * Possible IRQ numbers:
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+ * - IM3_IRL18 for GPHY0
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+ * - IM3_IRL17 for GPHY1
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+ *
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+ * Due to a silicon bug IRQ lines are not really independent from
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+ * each other. Sometimes the two lines are driven at the same time
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+ * if only one GPHY core raises the interrupt.
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+ */
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+
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+ reg = phy_read(phydev, MII_VR9_11G_ISTAT);
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+
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+ return (reg < 0) ? reg : 0;
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+}
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+
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+static int vr9_gphy_did_interrupt(struct phy_device *phydev)
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+{
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+ int reg;
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+
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+ reg = phy_read(phydev, MII_VR9_11G_ISTAT);
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+
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+ return reg > 0;
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+}
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+
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+static int vr9_gphy_config_intr(struct phy_device *phydev)
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+{
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+ int err;
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+
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+ if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
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+ err = phy_write(phydev, MII_VR9_11G_IMASK, INT_VR9_11G_MASK);
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+ else
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+ err = phy_write(phydev, MII_VR9_11G_IMASK, 0);
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+
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+ return err;
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+}
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+
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+static struct phy_driver lantiq_phy[] = {
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+ {
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+ .phy_id = 0xd565a400,
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+ .phy_id_mask = 0xfffffff8,
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+ .name = "Lantiq XWAY PEF7071",
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+ .features = (PHY_GBIT_FEATURES | SUPPORTED_Pause),
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+ .flags = 0, /*PHY_HAS_INTERRUPT,*/
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+ .config_init = vr9_gphy_config_init,
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+ .config_aneg = vr9_gphy_config_aneg,
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+ .read_status = genphy_read_status,
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+ .ack_interrupt = vr9_gphy_ack_interrupt,
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+ .did_interrupt = vr9_gphy_did_interrupt,
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+ .config_intr = vr9_gphy_config_intr,
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+ .driver = { .owner = THIS_MODULE },
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+ }, {
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+ .phy_id = 0x030260D0,
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+ .phy_id_mask = 0xfffffff0,
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+ .name = "Lantiq XWAY VR9 GPHY 11G v1.3",
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+ .features = (PHY_GBIT_FEATURES | SUPPORTED_Pause),
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+ .flags = 0, /*PHY_HAS_INTERRUPT,*/
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+ .config_init = vr9_gphy_config_init,
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+ .config_aneg = vr9_gphy_config_aneg,
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+ .read_status = genphy_read_status,
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+ .ack_interrupt = vr9_gphy_ack_interrupt,
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+ .did_interrupt = vr9_gphy_did_interrupt,
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+ .config_intr = vr9_gphy_config_intr,
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+ .driver = { .owner = THIS_MODULE },
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+ }, {
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+ .phy_id = 0xd565a408,
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+ .phy_id_mask = 0xfffffff8,
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+ .name = "Lantiq XWAY VR9 GPHY 11G v1.4",
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+ .features = (PHY_GBIT_FEATURES | SUPPORTED_Pause),
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+ .flags = 0, /*PHY_HAS_INTERRUPT,*/
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+ .config_init = vr9_gphy_config_init,
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+ .config_aneg = vr9_gphy_config_aneg,
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+ .read_status = genphy_read_status,
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+ .ack_interrupt = vr9_gphy_ack_interrupt,
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+ .did_interrupt = vr9_gphy_did_interrupt,
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+ .config_intr = vr9_gphy_config_intr,
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+ .driver = { .owner = THIS_MODULE },
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+ }, {
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+ .phy_id = 0xd565a418,
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+ .phy_id_mask = 0xfffffff8,
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+ .name = "Lantiq XWAY XRX PHY22F v1.4",
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+ .features = (PHY_BASIC_FEATURES | SUPPORTED_Pause),
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+ .flags = 0, /*PHY_HAS_INTERRUPT,*/
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+ .config_init = vr9_gphy_config_init,
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+ .config_aneg = vr9_gphy_config_aneg,
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+ .read_status = genphy_read_status,
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+ .ack_interrupt = vr9_gphy_ack_interrupt,
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+ .did_interrupt = vr9_gphy_did_interrupt,
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+ .config_intr = vr9_gphy_config_intr,
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+ .driver = { .owner = THIS_MODULE },
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+ },
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+};
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+
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+static int __init ltq_phy_init(void)
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+{
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(lantiq_phy); i++) {
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+ int err = phy_driver_register(&lantiq_phy[i]);
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+ if (err)
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+ pr_err("lantiq_phy: failed to load %s\n", lantiq_phy[i].name);
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+ }
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+
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+ return 0;
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+}
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+
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+static void __exit ltq_phy_exit(void)
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+{
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(lantiq_phy); i++)
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+ phy_driver_unregister(&lantiq_phy[i]);
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+}
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+
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+module_init(ltq_phy_init);
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+module_exit(ltq_phy_exit);
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+
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+MODULE_DESCRIPTION("Lantiq PHY drivers");
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+MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>");
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+MODULE_LICENSE("GPL");
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/phy/phy-lanitq.txt
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@@ -0,0 +1,216 @@
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+Lanitq PHY binding
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+============================================
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+
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+This devicetree binding controls the lantiq ethernet phys led functionality.
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+
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+Example:
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+ mdio@0 {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ compatible = "lantiq,xrx200-mdio";
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+ phy5: ethernet-phy@5 {
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+ reg = <0x1>;
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+ compatible = "lantiq,phy11g", "ethernet-phy-ieee802.3-c22";
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+ };
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+ phy11: ethernet-phy@11 {
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+ reg = <0x11>;
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+ compatible = "lantiq,phy22f", "ethernet-phy-ieee802.3-c22";
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+ lantiq,led2h = <0x00>;
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+ lantiq,led2l = <0x03>;
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+ };
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+ phy12: ethernet-phy@12 {
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+ reg = <0x12>;
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+ compatible = "lantiq,phy22f", "ethernet-phy-ieee802.3-c22";
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+ lantiq,led1h = <0x00>;
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+ lantiq,led1l = <0x03>;
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+ };
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+ phy13: ethernet-phy@13 {
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+ reg = <0x13>;
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+ compatible = "lantiq,phy22f", "ethernet-phy-ieee802.3-c22";
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+ lantiq,led2h = <0x00>;
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+ lantiq,led2l = <0x03>;
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+ };
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+ phy14: ethernet-phy@14 {
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+ reg = <0x14>;
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+ compatible = "lantiq,phy22f", "ethernet-phy-ieee802.3-c22";
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+ lantiq,led1h = <0x00>;
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+ lantiq,led1l = <0x03>;
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+ };
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+ };
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+
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+Register Description
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+============================================
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+
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+LEDCH:
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+
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+Name Hardware Reset Value
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+LEDCH 0x00C5
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+
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+| 15 | | | | | | | 8 |
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+=========================================
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+| RES |
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+=========================================
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+
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+| 7 | | | | | | | 0 |
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+=========================================
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+| FBF | SBF |RES | NACS |
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+=========================================
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+
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+Field Bits Type Description
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+FBF 7:6 RW Fast Blink Frequency
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+ ---
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+ 0x0 (00b) F02HZ 2 Hz blinking frequency
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+ 0x1 (01b) F04HZ 4 Hz blinking frequency
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+ 0x2 (10b) F08HZ 8 Hz blinking frequency
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+ 0x3 (11b) F16HZ 16 Hz blinking frequency
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+
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+SBF 5:4 RW Slow Blink Frequency
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+ ---
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+ 0x0 (00b) F02HZ 2 Hz blinking frequency
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+ 0x1 (01b) F04HZ 4 Hz blinking frequency
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+ 0x2 (10b) F08HZ 8 Hz blinking frequency
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+ 0x3 (11b) F16HZ 16 Hz blinking frequency
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+
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+NACS 2:0 RW Inverse of Scan Function
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+ ---
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+ 0x0 (000b) NONE No Function
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+ 0x1 (001b) LINK Complex function enabled when link is up
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+ 0x2 (010b) PDOWN Complex function enabled when device is powered-down
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+ 0x3 (011b) EEE Complex function enabled when device is in EEE mode
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+ 0x4 (100b) ANEG Complex function enabled when auto-negotiation is running
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+ 0x5 (101b) ABIST Complex function enabled when analog self-test is running
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+ 0x6 (110b) CDIAG Complex function enabled when cable diagnostics are running
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+ 0x7 (111b) TEST Complex function enabled when test mode is running
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+
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+LEDCL:
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+
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+Name Hardware Reset Value
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+LEDCL 0x0067
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+
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+| 15 | | | | | | | 8 |
|
|
+=========================================
|
|
+| RES |
|
|
+=========================================
|
|
+
|
|
+| 7 | | | | | | | 0 |
|
|
+=========================================
|
|
+|RES | SCAN |RES | CBLINK |
|
|
+=========================================
|
|
+
|
|
+Field Bits Type Description
|
|
+SCAN 6:4 RW Complex Scan Configuration
|
|
+ ---
|
|
+ 000 B NONE No Function
|
|
+ 001 B LINK Complex function enabled when link is up
|
|
+ 010 B PDOWN Complex function enabled when device is powered-down
|
|
+ 011 B EEE Complex function enabled when device is in EEE mode
|
|
+ 100 B ANEG Complex function enabled when auto-negotiation is running
|
|
+ 101 B ABIST Complex function enabled when analog self-test is running
|
|
+ 110 B CDIAG Complex function enabled when cable diagnostics are running
|
|
+ 111 B TEST Complex function enabled when test mode is running
|
|
+
|
|
+CBLINK 2:0 RW Complex Blinking Configuration
|
|
+ ---
|
|
+ 000 B NONE No Function
|
|
+ 001 B LINK Complex function enabled when link is up
|
|
+ 010 B PDOWN Complex function enabled when device is powered-down
|
|
+ 011 B EEE Complex function enabled when device is in EEE mode
|
|
+ 100 B ANEG Complex function enabled when auto-negotiation is running
|
|
+ 101 B ABIST Complex function enabled when analog self-test is running
|
|
+ 110 B CDIAG Complex function enabled when cable diagnostics are running
|
|
+ 111 B TEST Complex function enabled when test mode is running
|
|
+
|
|
+LEDxH:
|
|
+
|
|
+Name Hardware Reset Value
|
|
+LED0H 0x0070
|
|
+LED1H 0x0020
|
|
+LED2H 0x0040
|
|
+LED3H 0x0040
|
|
+
|
|
+| 15 | | | | | | | 8 |
|
|
+=========================================
|
|
+| RES |
|
|
+=========================================
|
|
+
|
|
+| 7 | | | | | | | 0 |
|
|
+=========================================
|
|
+| CON | BLINKF |
|
|
+=========================================
|
|
+
|
|
+Field Bits Type Description
|
|
+CON 7:4 RW Constant On Configuration
|
|
+ ---
|
|
+ 0x0 (0000b) NONE LED does not light up constantly
|
|
+ 0x1 (0001b) LINK10 LED is on when link is 10 Mbit/s
|
|
+ 0x2 (0010b) LINK100 LED is on when link is 100 Mbit/s
|
|
+ 0x3 (0011b) LINK10X LED is on when link is 10/100 Mbit/s
|
|
+ 0x4 (0100b) LINK1000 LED is on when link is 1000 Mbit/s
|
|
+ 0x5 (0101b) LINK10_0 LED is on when link is 10/1000 Mbit/s
|
|
+ 0x6 (0110b) LINK100X LED is on when link is 100/1000 Mbit/s
|
|
+ 0x7 (0111b) LINK10XX LED is on when link is 10/100/1000 Mbit/s
|
|
+ 0x8 (1000b) PDOWN LED is on when device is powered-down
|
|
+ 0x9 (1001b) EEE LED is on when device is in EEE mode
|
|
+ 0xA (1010b) ANEG LED is on when auto-negotiation is running
|
|
+ 0xB (1011b) ABIST LED is on when analog self-test is running
|
|
+ 0xC (1100b) CDIAG LED is on when cable diagnostics are running
|
|
+
|
|
+BLINKF 3:0 RW Fast Blinking Configuration
|
|
+ ---
|
|
+ 0x0 (0000b) NONE No Blinking
|
|
+ 0x1 (0001b) LINK10 Blink when link is 10 Mbit/s
|
|
+ 0x2 (0010b) LINK100 Blink when link is 100 Mbit/s
|
|
+ 0x3 (0011b) LINK10X Blink when link is 10/100 Mbit/s
|
|
+ 0x4 (0100b) LINK1000 Blink when link is 1000 Mbit/s
|
|
+ 0x5 (0101b) LINK10_0 Blink when link is 10/1000 Mbit/s
|
|
+ 0x6 (0110b) LINK100X Blink when link is 100/1000 Mbit/s
|
|
+ 0x7 (0111b) LINK10XX Blink when link is 10/100/1000 Mbit/s
|
|
+ 0x8 (1000b) PDOWN Blink when device is powered-down
|
|
+ 0x9 (1001b) EEE Blink when device is in EEE mode
|
|
+ 0xA (1010b) ANEG Blink when auto-negotiation is running
|
|
+ 0xB (1011b) ABIST Blink when analog self-test is running
|
|
+ 0xC (1100b) CDIAG Blink when cable diagnostics are running
|
|
+
|
|
+LEDxL:
|
|
+
|
|
+Name Hardware Reset Value
|
|
+LED0L 0x0003
|
|
+LED1L 0x0000
|
|
+LED2L 0x0000
|
|
+LED3L 0x0020
|
|
+
|
|
+| 15 | | | | | | | 8 |
|
|
+=========================================
|
|
+| RES |
|
|
+=========================================
|
|
+
|
|
+| 7 | | | | | | | 0 |
|
|
+=========================================
|
|
+| BLINKS | PULSE |
|
|
+=========================================
|
|
+
|
|
+Field Bits Type Description
|
|
+BLINKS 7:4 RW Slow Blinkin Configuration
|
|
+ ---
|
|
+ 0x0 (0000b) NONE No Blinking
|
|
+ 0x1 (0001b) LINK10 Blink when link is 10 Mbit/s
|
|
+ 0x2 (0010b) LINK100 Blink when link is 100 Mbit/s
|
|
+ 0x3 (0011b) LINK10X Blink when link is 10/100 Mbit/s
|
|
+ 0x4 (0100b) LINK1000 Blink when link is 1000 Mbit/s
|
|
+ 0x5 (0101b) LINK10_0 Blink when link is 10/1000 Mbit/s
|
|
+ 0x6 (0110b) LINK100X Blink when link is 100/1000 Mbit/s
|
|
+ 0x7 (0111b) LINK10XX Blink when link is 10/100/1000 Mbit/s
|
|
+ 0x8 (1000b) PDOWN Blink when device is powered-down
|
|
+ 0x9 (1001b) EEE Blink when device is in EEE mode
|
|
+ 0xA (1010b) ANEG Blink when auto-negotiation is running
|
|
+ 0xB (1011b) ABIST Blink when analog self-test is running
|
|
+ 0xC (1100b) CDIAG Blink when cable diagnostics are runningning
|
|
+
|
|
+PULSE 3:0 RW Pulsing Configuration
|
|
+ The pulse field is a mask field by which certain events can be combined
|
|
+ ---
|
|
+ 0x0 (0000b) NONE No pulsing
|
|
+ 0x1 (0001b) TXACT Transmit activity
|
|
+ 0x2 (0010b) RXACT Receive activity
|
|
+ 0x4 (0100b) COL Collision
|
|
+ 0x8 (1000b) RES Reserved
|