linux-kernel - [PATCH] add hardware I2C support for ARM IMX23

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Date:	Wed, 28 Nov 2012 15:24:03 +0100
From:	"sander van ginkel" <sander@...-ginkel.eu>
To:	linux-kernel@...r.kernel.org
Cc:	kernel@...gutronix.de, shawn.guo@...aro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] add hardware I2C support for ARM IMX23

The I2C hardware in the IMX233 is currently not supported,
however the i2c-mxs driver seems to be suitable.
To use the i2c-mxs driver it has to be added to the devicetree
for the IMX23.


Signed-off-by: Sander van Ginkel <sander@...-ginkel.eu>
---
diff -Naur linux-3.7-rc6/arch/arm/boot/dts/imx23-olinuxino.dts  
linux-3.7-rc6-i2c/arch/arm/boot/dts/imx23-olinuxino.dts
--- linux-3.7-rc6/arch/arm/boot/dts/imx23-olinuxino.dts	2012-11-17  
01:42:40.000000000 +0000
+++ linux-3.7-rc6-i2c/arch/arm/boot/dts/imx23-olinuxino.dts	2012-11-24  
22:40:51.000000000 +0000
@@ -50,6 +50,13 @@
		};

		apbx@...40000 {
+
+			i2c0: i2c@...58000 {
+				pinctrl-names = "default";
+				pinctrl-0 = <&i2c0_pins_a>;
+				status = "okay";
+			};
+
			duart: serial@...70000 {
				pinctrl-names = "default";
				pinctrl-0 = <&duart_pins_a>;
diff -Naur linux-3.7-rc6/arch/arm/boot/dts/imx23.dtsi  
linux-3.7-rc6-i2c/arch/arm/boot/dts/imx23.dtsi
--- linux-3.7-rc6/arch/arm/boot/dts/imx23.dtsi	2012-11-17  
01:42:40.000000000 +0000
+++ linux-3.7-rc6-i2c/arch/arm/boot/dts/imx23.dtsi	2012-11-24  
22:40:51.000000000 +0000
@@ -144,6 +144,17 @@
					fsl,pull-up = <0>;
				};

+				i2c0_pins_a: i2c0@0 {
+					reg = <0>;
+					fsl,pinmux-ids = <
+						0x1171 /* MX23_PAD_LCD_ENABLE__I2C_SCL */
+						0x1181 /* MX23_PAD_LCD_HSYNC__I2C_SDA */
+					>;
+					fsl,drive-strength = <1>;
+					fsl,voltage = <1>;
+					fsl,pull-up = <1>;
+				};
+
				auart0_2pins_a: auart0-2pins@0 {
					reg = <0>;
					fsl,pinmux-ids = <
@@ -387,9 +398,15 @@
				status = "disabled";
			};

-			i2c@...58000 {
+			i2c0: i2c@...58000 {
+				#address-cells = <2>;
+				#size-cells = <1>;
+				compatible = "fsl,imx28-i2c";
				reg = <0x80058000 0x2000>;
+				interrupts = <26 27>;
+				clock-frequency = <100000>;
				status = "disabled";
+				fsl,i2c-dma-channel = <3>;
			};

			rtc@...5c000 {

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