Make it possible to fallback to GPIO for I2C4 on the EXIO-B connector. This is based on reference work for the I2C0 core of the lager/r8a7790 by Wolfram Sang.
Cc: Wolfram Sang <[email protected]> Signed-off-by: Simon Horman <[email protected]> --- v3 * New Patch --- arch/arm/boot/dts/r8a7794-alt.dts | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/arm/boot/dts/r8a7794-alt.dts b/arch/arm/boot/dts/r8a7794-alt.dts index d00b1b33f6ed..10f72e700685 100644 --- a/arch/arm/boot/dts/r8a7794-alt.dts +++ b/arch/arm/boot/dts/r8a7794-alt.dts @@ -19,7 +19,9 @@ aliases { serial0 = &scif2; i2c9 = "gpioi2c1"; + i2c10 = "gpioi2c4"; i2c11 = "i2chdmi"; + i2c12 = "i2cexio4"; }; chosen { @@ -92,6 +94,17 @@ i2c-gpio,delay-us = <5>; }; + gpioi2c4: i2c-10 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "i2c-gpio"; + status = "disabled"; + gpios = <&gpio4 9 GPIO_ACTIVE_HIGH /* sda */ + &gpio4 8 GPIO_ACTIVE_HIGH /* scl */ + >; + i2c-gpio,delay-us = <5>; + }; + /* * A fallback to GPIO is provided for I2C1. */ @@ -115,6 +128,18 @@ }; }; }; + + /* + * I2C4 is routed to EXIO connector B, pins 73 (SCL) + 74 (SDA). + * A fallback to GPIO is provided. + */ + i2cexio4: i2c-14 { + compatible = "i2c-demux-pinctrl"; + i2c-parent = <&i2c4>, <&gpioi2c4>; + i2c-bus-name = "i2c-exio4"; + #address-cells = <1>; + #size-cells = <0>; + }; }; &du { @@ -174,6 +199,11 @@ function = "i2c1"; }; + i2c4_pins: i2c4 { + groups = "i2c4"; + function = "i2c4"; + }; + vin0_pins: vin0 { groups = "vin0_data8", "vin0_clk"; function = "vin0"; @@ -214,6 +244,11 @@ clock-frequency = <400000>; }; +&i2c4 { + pinctrl-0 = <&i2c4_pins>; + pinctrl-names = "i2c-exio4"; +}; + &vin0 { status = "okay"; pinctrl-0 = <&vin0_pins>; -- 2.1.4
