diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0214-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0214-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0214-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch b/target/linux/brcm2708/patches-4.4/0214-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch new file mode 100644 index 0000000000..cb41cceee4 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0214-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch @@ -0,0 +1,133 @@ +From 09e64d48934eb812bab8667dcce81d0387092644 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <6by9@users.noreply.github.com> +Date: Thu, 17 Mar 2016 18:16:16 +0000 +Subject: [PATCH 214/232] Add configs and overlay for PCA9548 I2C mux + +Adds kernel configs for I2C muxes and a dt overlay for PCA9548 +that adds the 8 muxed I2C buses and mux device. +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 6 ++ + .../boot/dts/overlays/i2c-mux-pca9548a-overlay.dts | 67 ++++++++++++++++++++++ + arch/arm/configs/bcm2709_defconfig | 2 + + arch/arm/configs/bcmrpi_defconfig | 2 + + 5 files changed, 78 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -29,6 +29,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hy28a.dtbo + dtbo-$(RPI_DT_OVERLAYS) += hy28b.dtbo + dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo + dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo ++dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9548a.dtbo + dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo + dtbo-$(RPI_DT_OVERLAYS) += i2c1-bcm2708.dtbo + dtbo-$(RPI_DT_OVERLAYS) += i2s-mmap.dtbo +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -360,6 +360,12 @@ Params: i2c_gpio_sda GPIO use + (default "2" = ~100kHz) + + ++Name: i2c-mux-pca9548a ++Info: Adds support for an NXP PCA9548A I2C multiplexer on i2c_arm ++Load: dtoverlay=i2c-mux-pca9548a,<param>=<val> ++Params: addr I2C address of PCA9548A (default 0x70) ++ ++ + Name: i2c-rtc + Info: Adds support for a number of I2C Real Time Clock devices + Load: dtoverlay=i2c-rtc,<param>=<val> +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts +@@ -0,0 +1,67 @@ ++// Definitions for NXP PCA9548A I2C mux on ARM I2C bus. ++/dts-v1/; ++/plugin/; ++ ++/{ ++ compatible = "brcm,bcm2708"; ++ ++ fragment@0 { ++ target = <&i2c_arm>; ++ __overlay__ { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ status = "okay"; ++ ++ i2cmux: mux@70 { ++ compatible = "nxp,pca9548"; ++ reg = <0x70>; ++ #address-cells = <1>; ++ #size-cells = <0>; ++ ++ i2c@0 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <0>; ++ }; ++ i2c@1 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <1>; ++ }; ++ i2c@2 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <2>; ++ }; ++ i2c@3 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <3>; ++ }; ++ i2c@4 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <4>; ++ }; ++ i2c@5 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <5>; ++ }; ++ i2c@6 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <6>; ++ }; ++ i2c@7 { ++ #address-cells = <1>; ++ #size-cells = <0>; ++ reg = <7>; ++ }; ++ }; ++ }; ++ }; ++ __overrides__ { ++ addr = <&i2cmux>,"reg:0"; ++ }; ++}; +--- a/arch/arm/configs/bcm2709_defconfig ++++ b/arch/arm/configs/bcm2709_defconfig +@@ -600,6 +600,8 @@ CONFIG_I2C=y + CONFIG_I2C_CHARDEV=m + CONFIG_I2C_BCM2708=m + CONFIG_I2C_GPIO=m ++CONFIG_I2C_MUX=m ++CONFIG_I2C_MUX_PCA954x=m + CONFIG_SPI=y + CONFIG_SPI_BCM2835=m + CONFIG_SPI_BCM2835AUX=m +--- a/arch/arm/configs/bcmrpi_defconfig ++++ b/arch/arm/configs/bcmrpi_defconfig +@@ -593,6 +593,8 @@ CONFIG_I2C=y + CONFIG_I2C_CHARDEV=m + CONFIG_I2C_BCM2708=m + CONFIG_I2C_GPIO=m ++CONFIG_I2C_MUX=m ++CONFIG_I2C_MUX_PCA954x=m + CONFIG_SPI=y + CONFIG_SPI_BCM2835=m + CONFIG_SPI_BCM2835AUX=m |