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Build i2c_gpio module and add a device tree overlay to configure it.

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This commit is contained in:
Alistair Buxton
2015-11-01 22:27:56 +00:00
committed by popcornmix
parent 9499c67a83
commit f557945d13
5 changed files with 42 additions and 0 deletions
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1
arch/arm/boot/dts/overlays/Makefile
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@@ -25,6 +25,7 @@ dtb-$(RPI_DT_OVERLAYS) += hifiberry-digi-overlay.dtb
dtb-$(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

11
arch/arm/boot/dts/overlays/README
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@@ -284,6 +284,17 @@ Params: speed Display SPI bus speed
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>

28
arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts Normal file
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@@ -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";
};
};

1
arch/arm/configs/bcm2709_defconfig
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@@ -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_BCM2708=m

1
arch/arm/configs/bcmrpi_defconfig
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@@ -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_BCM2708=m