brcm2708: add linux 4.4 support

[openwrt.git] / target / linux / brcm2708 / patches-4.4 / 0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch

diff --git a/target/linux/brcm2708/patches-4.4/0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch b/target/linux/brcm2708/patches-4.4/0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch
new file mode 100644 (file)
index 0000000..4a501a2
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch
@@ -0,0 +1,100 @@
+From 5371d757db191f77f115b1248184e2f1a15dfa4b 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 107/127] 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               | 13 +++++++++++-
+ 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, 43 insertions(+), 1 deletion(-)
+ 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
+@@ -287,9 +287,20 @@ 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>=<val>
++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>
++Load:   dtoverlay=i2c-rtc,<param>=<val>
+ Params: ds1307                   Select the DS1307 device
+ 
+         ds3231                   Select the DS3231 device
+--- /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
+@@ -595,6 +595,7 @@ CONFIG_RAW_DRIVER=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_SPIDEV=y
+--- a/arch/arm/configs/bcmrpi_defconfig
++++ b/arch/arm/configs/bcmrpi_defconfig
+@@ -588,6 +588,7 @@ CONFIG_RAW_DRIVER=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_SPIDEV=y