2016-07-07 07:22:07 +00:00
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From 377a971a6d66cd45f011daeb17eaf6cbba59f54c Mon Sep 17 00:00:00 2001
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2016-01-17 10:42:23 +00:00
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From: Alistair Buxton <a.j.buxton@gmail.com>
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Date: Sun, 1 Nov 2015 22:27:56 +0000
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2016-07-07 07:22:07 +00:00
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Subject: [PATCH 106/423] Build i2c_gpio module and add a device tree overlay
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2016-01-17 10:42:23 +00:00
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to configure it.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 13 +++++++++++-
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arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 28 +++++++++++++++++++++++++
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arch/arm/configs/bcm2709_defconfig | 1 +
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arch/arm/configs/bcmrpi_defconfig | 1 +
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5 files changed, 43 insertions(+), 1 deletion(-)
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create mode 100644 arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -25,6 +25,7 @@ dtb-$(RPI_DT_OVERLAYS) += hifiberry-digi
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dtb-$(RPI_DT_OVERLAYS) += hy28a-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += hy28b-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += i2c-rtc-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += i2c-gpio-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += i2s-mmap-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -287,9 +287,20 @@ Params: speed Display
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ledgpio GPIO used to control backlight
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+Name: i2c-gpio
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+Info: Adds support for software i2c controller on gpio pins
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+Load: dtoverlay=i2c-gpio,<param>=<val>
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+Params: i2c_gpio_sda GPIO used for I2C data (default "23")
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+
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+ i2c_gpio_scl GPIO used for I2C clock (default "24")
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+
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+ i2c_gpio_delay_us Clock delay in microseconds
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+ (default "2" = ~100kHz)
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+
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+
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Name: i2c-rtc
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Info: Adds support for a number of I2C Real Time Clock devices
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-Load: dtoverlay=i2c-rtc,<param>
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+Load: dtoverlay=i2c-rtc,<param>=<val>
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Params: ds1307 Select the DS1307 device
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ds3231 Select the DS3231 device
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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@@ -0,0 +1,28 @@
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+// Overlay for i2c_gpio bitbanging host bus.
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ i2c_gpio: i2c@0 {
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+ compatible = "i2c-gpio";
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+ gpios = <&gpio 23 0 /* sda */
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+ &gpio 24 0 /* scl */
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+ >;
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+ i2c-gpio,delay-us = <2>; /* ~100 kHz */
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ };
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+ };
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+ };
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+ __overrides__ {
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+ i2c_gpio_sda = <&i2c_gpio>,"gpios:4";
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+ i2c_gpio_scl = <&i2c_gpio>,"gpios:16";
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+ i2c_gpio_delay_us = <&i2c_gpio>,"i2c-gpio,delay-us:0";
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+ };
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+};
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+
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--- a/arch/arm/configs/bcm2709_defconfig
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+++ b/arch/arm/configs/bcm2709_defconfig
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@@ -595,6 +595,7 @@ CONFIG_RAW_DRIVER=y
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CONFIG_I2C=y
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CONFIG_I2C_CHARDEV=m
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CONFIG_I2C_BCM2708=m
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+CONFIG_I2C_GPIO=m
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CONFIG_SPI=y
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CONFIG_SPI_BCM2835=m
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CONFIG_SPI_SPIDEV=y
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--- a/arch/arm/configs/bcmrpi_defconfig
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+++ b/arch/arm/configs/bcmrpi_defconfig
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@@ -588,6 +588,7 @@ CONFIG_RAW_DRIVER=y
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CONFIG_I2C=y
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CONFIG_I2C_CHARDEV=m
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CONFIG_I2C_BCM2708=m
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+CONFIG_I2C_GPIO=m
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CONFIG_SPI=y
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CONFIG_SPI_BCM2835=m
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CONFIG_SPI_SPIDEV=y
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