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ARM: dts: alt: use demuxer for I2C4

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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.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Simon Horman
2016-11-06 21:20:30 +01:00
parent 6723438b3b
commit e60a19f03c
1 changed files with 35 additions and 0 deletions
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35
arch/arm/boot/dts/r8a7794-alt.dts
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@@ -18,6 +18,8 @@ / {
aliases {
serial0 = &scif2;
i2c10 = &gpioi2c4;
i2c12 = &i2cexio4;
};
chosen {
@@ -135,6 +137,29 @@ x13_clk: x13-clock {
#clock-cells = <0>;
clock-frequency = <148500000>;
};
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>;
};
/*
* 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 {
@@ -194,6 +219,11 @@ i2c1_pins: i2c1 {
function = "i2c1";
};
i2c4_pins: i2c4 {
groups = "i2c4";
function = "i2c4";
};
vin0_pins: vin0 {
groups = "vin0_data8", "vin0_clk";
function = "vin0";
@@ -314,6 +344,11 @@ adv7180: endpoint {
};
};
&i2c4 {
pinctrl-0 = <&i2c4_pins>;
pinctrl-names = "i2c-exio4";
};
&vin0 {
status = "okay";
pinctrl-0 = <&vin0_pins>;