diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0107-Build-i2c_gpio-module-and-add-a-device-tree-overlay-.patch | 100 |
1 files changed, 100 insertions, 0 deletions
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 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 |