arm64: dts: renesas: eagle: add I2C0 support

Define the Eagle board dependent part of the I2C0 device node.

The I2C0 bus is populated by ON Semiconductor PCA9653 I/O expander and Analog Devices ADV7511W HDMI transmitter (but we're only describing the former chip now).

Based on the original (and large) patch by Vladimir Barinov.

---
 arch/arm64/boot/dts/renesas/r8a77970-eagle.dts |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

Index: renesas/arch/arm64/boot/dts/renesas/r8a77970-eagle.dts
===================================================================
@@ -57,12 +57,32 @@
 	clock-frequency = <32768>;
 };
 
+&i2c0 {
+	pinctrl-0 = <&i2c0_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+	clock-frequency = <400000>;
+
+	io_expander: gpio at 20 {
+		compatible = "onnn,pca9654";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+};
+
 &pfc {
 	avb_pins: avb {
 		groups = "avb0_mdio", "avb0_mii";
 		function = "avb0";
 	};
 
+	i2c0_pins: i2c0 {
+		groups = "i2c0";
+		function = "i2c0";
+	};
+
 	scif0_pins: scif0 {
 		groups = "scif0_data";
 		function = "scif0";

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds