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@xxxxxxxxxxxx>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
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 a3e74684289b..7270d4224b1a 100644
--- a/arch/arm/boot/dts/r8a7794-alt.dts
+++ b/arch/arm/boot/dts/r8a7794-alt.dts
@@ -18,6 +18,8 @@
aliases {
serial0 = &scif2;
+ i2c10 = &gpioi2c4;
+ i2c12 = &i2cexio4;
};
chosen {
@@ -135,6 +137,29 @@
#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 @@
function = "i2c1";
};
+ i2c4_pins: i2c4 {
+ groups = "i2c4";
+ function = "i2c4";
+ };
+
vin0_pins: vin0 {
groups = "vin0_data8", "vin0_clk";
function = "vin0";
@@ -314,6 +344,11 @@
};
};
+&i2c4 {
+ pinctrl-0 = <&i2c4_pins>;
+ pinctrl-names = "i2c-exio4";
+};
+
&vin0 {
status = "okay";
pinctrl-0 = <&vin0_pins>;
--
2.7.0.rc3.207.g0ac5344
