70 lines
2.0 KiB
Diff
70 lines
2.0 KiB
Diff
From 0583a0c3f173c327dff70ee9d7a0d70e50b5d120 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 1 Jul 2016 22:34:52 +0100
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Subject: [PATCH] BCM270X_DT: Overlay to re-enable HW CS on SPI0
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See: https://github.com/raspberrypi/linux/issues/1547
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 6 ++++++
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arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts | 26 +++++++++++++++++++++++
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3 files changed, 33 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -81,6 +81,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
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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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@@ -1006,6 +1006,12 @@ Load: dtoverlay=spi-rtc,<param>=<val>
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Params: pcf2123 Select the PCF2123 device
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+Name: spi0-hw-cs
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+Info: Re-enables hardware CS/CE (chip selects) for SPI0
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+Load: dtoverlay=spi0-hw-cs
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+Params: <None>
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+
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+
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Name: spi1-1cs
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Info: Enables spi1 with a single chip select (CS) line and associated spidev
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dev node. The gpio pin number for the CS line and spidev device node
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
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@@ -0,0 +1,26 @@
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+/*
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+ * Device tree overlay to re-enable hardware CS for SPI0
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
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+
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+ fragment@0 {
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+ target = <&spi0>;
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+ __overlay__ {
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+ cs-gpios = <0>, <0>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spi0_cs_pins>;
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+ __overlay__ {
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+ brcm,pins = <8 7>;
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+ brcm,function = <4>; /* alt0 */
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+ };
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+ };
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+};
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