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