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Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0209-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0209-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch96
1 files changed, 96 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0209-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch b/target/linux/brcm2708/patches-4.1/0209-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch
new file mode 100644
index 0000000000..573f179343
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0209-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch
@@ -0,0 +1,96 @@
+From 43833958324dc349e49c0e4e2fa6fe36ebc7508d Mon Sep 17 00:00:00 2001
+From: Alistair Buxton <a.j.buxton@gmail.com>
+Date: Sun, 1 Nov 2015 22:27:56 +0000
+Subject: [PATCH 209/222] Build i2c_gpio module and add a device tree overlay
+ to configure it.
+
+---
+ arch/arm/boot/dts/overlays/Makefile | 1 +
+ arch/arm/boot/dts/overlays/README | 11 ++++++++++
+ arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 28 +++++++++++++++++++++++++
+ arch/arm/configs/bcm2709_defconfig | 1 +
+ arch/arm/configs/bcmrpi_defconfig | 1 +
+ 5 files changed, 42 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -25,6 +25,7 @@ dtb-$(RPI_DT_OVERLAYS) += hifiberry-digi
+ dtb-$(RPI_DT_OVERLAYS) += hy28a-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += hy28b-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += i2c-rtc-overlay.dtb
++dtb-$(RPI_DT_OVERLAYS) += i2c-gpio-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += i2s-mmap-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -284,6 +284,17 @@ Params: speed Display
+ ledgpio GPIO used to control backlight
+
+
++Name: i2c-gpio
++Info: Adds support for software i2c controller on gpio pins
++Load: dtoverlay=i2c-gpio,<param>
++Params: i2c_gpio_sda GPIO used for I2C data (default "23")
++
++ i2c_gpio_scl GPIO used for I2C clock (default "24")
++
++ i2c_gpio_delay_us Clock delay in microseconds
++ (default "2" = ~100kHz)
++
++
+ Name: i2c-rtc
+ Info: Adds support for a number of I2C Real Time Clock devices
+ Load: dtoverlay=i2c-rtc,<param>
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
+@@ -0,0 +1,28 @@
++// Overlay for i2c_gpio bitbanging host bus.
++/dts-v1/;
++/plugin/;
++
++/ {
++ compatible = "brcm,bcm2708";
++
++ fragment@0 {
++ target-path = "/";
++ __overlay__ {
++ i2c_gpio: i2c@0 {
++ compatible = "i2c-gpio";
++ gpios = <&gpio 23 0 /* sda */
++ &gpio 24 0 /* scl */
++ >;
++ i2c-gpio,delay-us = <2>; /* ~100 kHz */
++ #address-cells = <1>;
++ #size-cells = <0>;
++ };
++ };
++ };
++ __overrides__ {
++ i2c_gpio_sda = <&i2c_gpio>,"gpios:4";
++ i2c_gpio_scl = <&i2c_gpio>,"gpios:16";
++ i2c_gpio_delay_us = <&i2c_gpio>,"i2c-gpio,delay-us:0";
++ };
++};
++
+--- a/arch/arm/configs/bcm2709_defconfig
++++ b/arch/arm/configs/bcm2709_defconfig
+@@ -593,6 +593,7 @@ CONFIG_BCM_VC_SM=y
+ CONFIG_I2C=y
+ CONFIG_I2C_CHARDEV=m
+ CONFIG_I2C_BCM2708=m
++CONFIG_I2C_GPIO=m
+ CONFIG_SPI=y
+ CONFIG_SPI_BCM2835=m
+ CONFIG_SPI_BCM2708=m
+--- a/arch/arm/configs/bcmrpi_defconfig
++++ b/arch/arm/configs/bcmrpi_defconfig
+@@ -586,6 +586,7 @@ CONFIG_BCM_VC_SM=y
+ CONFIG_I2C=y
+ CONFIG_I2C_CHARDEV=m
+ CONFIG_I2C_BCM2708=m
++CONFIG_I2C_GPIO=m
+ CONFIG_SPI=y
+ CONFIG_SPI_BCM2835=m
+ CONFIG_SPI_BCM2708=m