82 lines
2.5 KiB
Diff
82 lines
2.5 KiB
Diff
From 0c30ca161cd0aeda5ce514055897c07dcdf8e5cb Mon Sep 17 00:00:00 2001
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From: campag <dave-lowe@ntlworld.com>
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Date: Wed, 24 Feb 2016 16:45:42 +0000
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Subject: [PATCH] BCM270X_DT: Add 1-bit SDIO using minimal pins...
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... for that mode: GPIOs 22-25.
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---
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arch/arm/boot/dts/overlays/README | 21 ++++++++++++++
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arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts | 36 ++++++++++++++++++++++++
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2 files changed, 57 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -709,6 +709,27 @@ Params: overclock_50 SD Clock
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bus_width Set the SDIO host bus width (default 4 bits)
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+Name: sdio-1bit
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+Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
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+ and enables 1-bit SDIO via GPIOs 22-25.
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+Load: dtoverlay=sdio-1bit,<param>=<val>
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+Params: overclock_50 SD Clock (in MHz) to use when the MMC framework
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+ requests 50MHz
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+
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+ sdio_overclock SDIO Clock (in MHz) to use when the MMC
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+ framework requests 50MHz
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+
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+ force_pio Disable DMA support (default off)
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+
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+ pio_limit Number of blocks above which to use DMA
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+ (default 1)
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+
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+ debug Enable debug output (default off)
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+
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+ poll_once Disable SDIO-device polling every second
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+ (default on: polling once at boot-time)
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+
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+
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Name: sdtweak
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Info: Tunes the bcm2835-sdhost SD/MMC driver
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Load: dtoverlay=sdtweak,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts
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@@ -0,0 +1,36 @@
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+/* Enable 1-bit SDIO from MMC interface via GPIOs 22-25. Includes sdhost overlay. */
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+
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+/include/ "sdhost-overlay.dts"
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@3 {
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+ target = <&mmc>;
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+ sdio_mmc: __overlay__ {
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+ compatible = "brcm,bcm2835-mmc";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&sdio_pins>;
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+ non-removable;
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+ bus-width = <1>;
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+ brcm,overclock-50 = <0>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@4 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ sdio_pins: sdio_pins {
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+ brcm,pins = <22 23 24 25>;
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+ brcm,function = <7 7 7 7>; /* ALT3 = SD1 */
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+ brcm,pull = <0 2 2 2>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ poll_once = <&sdio_mmc>,"non-removable?";
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+ sdio_overclock = <&sdio_mmc>,"brcm,overclock-50:0";
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+ };
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+};
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