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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch80
1 files changed, 80 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch b/target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch
new file mode 100644
index 0000000000..26930baadd
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch
@@ -0,0 +1,80 @@
+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";
++ };
++ };
++};