From: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Make it possible to fallback to GPIO for I2C4 on the EXIO-E 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, corrected board name in subject, and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/r8a7793-gose.dts | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/arch/arm/boot/dts/r8a7793-gose.dts b/arch/arm/boot/dts/r8a7793-gose.dts
index df07dc252537fe..d22b9f969eaba8 100644
--- a/arch/arm/boot/dts/r8a7793-gose.dts
+++ b/arch/arm/boot/dts/r8a7793-gose.dts
@@ -49,7 +49,9 @@
serial0 = &scif0;
serial1 = &scif1;
i2c9 = &gpioi2c2;
+ i2c10 = &gpioi2c4;
i2c11 = &i2chdmi;
+ i2c12 = &i2cexio4;
};
chosen {
@@ -289,6 +291,17 @@
i2c-gpio,delay-us = <5>;
};
+ gpioi2c4: i2c-10 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "i2c-gpio";
+ status = "disabled";
+ gpios = <&gpio7 14 GPIO_ACTIVE_HIGH /* sda */
+ &gpio7 13 GPIO_ACTIVE_HIGH /* scl */
+ >;
+ i2c-gpio,delay-us = <5>;
+ };
+
/*
* A fallback to GPIO is provided for I2C2.
*/
@@ -371,6 +384,18 @@
pagesize = <16>;
};
};
+
+ /*
+ * I2C4 is routed to EXIO connector E, pins 37 (SCL) + 39 (SDA).
+ * A fallback to GPIO is provided.
+ */
+ i2cexio4: i2c-12 {
+ compatible = "i2c-demux-pinctrl";
+ i2c-parent = <&i2c4>, <&gpioi2c4>;
+ i2c-bus-name = "i2c-exio4";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
};
&du {
@@ -411,6 +436,11 @@
function = "i2c2";
};
+ i2c4_pins: i2c4 {
+ groups = "i2c4";
+ function = "i2c4";
+ };
+
du_pins: du {
groups = "du_rgb888", "du_sync", "du_disp", "du_clk_out_0";
function = "du";
@@ -600,6 +630,11 @@
clock-frequency = <100000>;
};
+&i2c4 {
+ pinctrl-0 = <&i2c4_pins>;
+ pinctrl-names = "i2c-exio4";
+};
+
&rcar_sound {
pinctrl-0 = <&sound_pins &sound_clk_pins>;
pinctrl-names = "default";
--
2.9.3
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