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From 726da40b8c272d181a41686195f91b914363167b Mon Sep 17 00:00:00 2001
From: Tim Gover <tim.gover@raspberrypi.org>
Date: Tue, 22 Jan 2019 10:49:41 +0000
Subject: [PATCH] overlays: Add the spi-gpio40-45 overlay
The 2711 B0 boot EEPROM is programmed via SPI0 on GPIO
pins 40-43 CS0. Add a device tree overlay to optionally
change the SPI0 pinmux from the external GPIO pins to
the boot EEPROM pins.
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 6 ++++
.../dts/overlays/spi-gpio40-45-overlay.dts | 36 +++++++++++++++++++
3 files changed, 43 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/spi-gpio40-45-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
smi-dev.dtbo \
smi-nand.dtbo \
spi-gpio35-39.dtbo \
+ spi-gpio40-45.dtbo \
spi-rtc.dtbo \
spi0-cs.dtbo \
spi0-hw-cs.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1967,6 +1967,12 @@ Load: dtoverlay=spi-gpio35-39
Params: <None>
+Name: spi-gpio40-45
+Info: Move SPI function block to GPIOs 40 to 45
+Load: dtoverlay=spi-gpio40-45
+Params: <None>
+
+
Name: spi-rtc
Info: Adds support for a number of SPI Real Time Clock devices
Load: dtoverlay=spi-rtc,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/spi-gpio40-45-overlay.dts
@@ -0,0 +1,36 @@
+/*
+ * Boot EEPROM overlay
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ cs-gpios = <&gpio 43 1>, <&gpio 44 1>, <&gpio 45 1>;
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&spi0_cs_pins>;
+ __overlay__ {
+ brcm,pins = <45 44 43>;
+ brcm,function = <1>; /* output */
+ status = "okay";
+ };
+ };
+
+ fragment@2 {
+ target = <&spi0_pins>;
+ __overlay__ {
+ brcm,pins = <40 41 42>;
+ brcm,function = <3>; /* alt4 */
+ status = "okay";
+ };
+ };
+};
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