From 129ca9e185ab34e939eab91ef8f10c115fc43ba5 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 20 Mar 2019 20:44:09 +0100
Subject: [PATCH] ARM: dts: rskrza1: Add I2C support

Enable the I2C bus, and add the following devices:
  - Two CAT9554 port expanders (8 GPIOs, interrupt not wired by
    default),
  - R1EX24016ASAS0A EEPROM.

The bus also contains a MAX9856 Audio Codec, which is not yet supported.

All devices (incl. the audio codec) are documented to support an I2C bus
running at 400 kHz.

Pinctrl is based on the RZ/A BSP.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 arch/arm/boot/dts/r7s72100-rskrza1.dts | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm/boot/dts/r7s72100-rskrza1.dts b/arch/arm/boot/dts/r7s72100-rskrza1.dts
index 8ee44a100e9a..60e80ecbbf68 100644
--- a/arch/arm/boot/dts/r7s72100-rskrza1.dts
+++ b/arch/arm/boot/dts/r7s72100-rskrza1.dts
@@ -47,6 +47,34 @@ &extal_clk {
 	clock-frequency = <13330000>;
 };
 
+&i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+	status = "okay";
+
+	clock-frequency = <400000>;
+
+	io_expander1: gpio@20 {
+		compatible = "onnn,cat9554";
+		reg = <0x20>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	io_expander2: gpio@21 {
+		compatible = "onnn,cat9554";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	eeprom@50 {
+		compatible = "renesas,r1ex24016", "atmel,24c16";
+		reg = <0x50>;
+		pagesize = <16>;
+	};
+};
+
 &usb_x1_clk {
 	clock-frequency = <48000000>;
 };
@@ -56,6 +84,11 @@ &rtc_x1_clk {
 };
 
 &pinctrl {
+	/* RIIC ch3 (Port Expander, EEPROM (MAC Addr), Audio Codec) */
+	i2c3_pins: i2c3 {
+		pinmux = <RZA1_PINMUX(1, 6, 1)>,	/* RIIC3SCL */
+			 <RZA1_PINMUX(1, 7, 1)>;	/* RIIC3SDA */
+	};
 
 	/* Serial Console */
 	scif2_pins: serial2 {