linux-kernel - [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging

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Message-Id: <1372094699-3832-3-git-send-email-alexandre.belloni@free-electrons.com>
Date:	Mon, 24 Jun 2013 19:24:58 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Shawn Guo <shawn.guo@...aro.org>,
	Jonathan Cameron <jic23@....ac.uk>
Cc:	jimwall@...om, brian@...stalfontz.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, Rob Landley <rob@...dley.net>,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCHv3 2/3] ARM: mxs: cfa10049: Switch bus i2c1 to bitbanging

From: Maxime Ripard <maxime.ripard@...e-electrons.com>

The ADCs connected to this bus have been experiencing some timeout
issues when using the iMX28 i2c controller. Switching back to bitbanging
solves this.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 arch/arm/boot/dts/imx28-cfa10049.dts | 108 +++++++++++++++++++++--------------
 1 file changed, 65 insertions(+), 43 deletions(-)

diff --git a/arch/arm/boot/dts/imx28-cfa10049.dts b/arch/arm/boot/dts/imx28-cfa10049.dts
index 05ae549..d3758c2 100644
--- a/arch/arm/boot/dts/imx28-cfa10049.dts
+++ b/arch/arm/boot/dts/imx28-cfa10049.dts
@@ -139,6 +139,17 @@
 					fsl,pull-up = <0>; /* 0 will enable the keeper */
 				};
 
+				i2c1_pins_cfa10049: i2c1@0 {
+					reg = <0>;
+					fsl,pinmux-ids = <
+						0x3103 /* MX28_PAD_PWM0__GPIO */
+						0x3113 /* MX28_PAD_PWM1__I2C1_SDA */
+					>;
+					fsl,drive-strength = <1>;
+					fsl,voltage = <1>;
+					fsl,pull-up = <1>;
+				};
+
 				fiq_pins_cfa10049: fiq@0 {
 					reg = <0>;
 					fsl,pinmux-ids = <
@@ -199,49 +210,6 @@
 				status = "okay";
 			};
 
-			i2c1: i2c@...5a000 {
-				pinctrl-names = "default";
-				pinctrl-0 = <&i2c1_pins_a>;
-				status = "okay";
-			};
-
-			i2cmux {
-				compatible = "i2c-mux-gpio";
-				#address-cells = <1>;
-				#size-cells = <0>;
-				mux-gpios = <&gpio1 22 0 &gpio1 23 0>;
-				i2c-parent = <&i2c1>;
-
-				i2c@0 {
-					reg = <0>;
-				};
-
-				i2c@1 {
-					reg = <1>;
-				};
-
-				i2c@2 {
-					reg = <2>;
-				};
-
-				i2c@3 {
-					reg = <3>;
-					#address-cells = <1>;
-					#size-cells = <0>;
-
-					pca9555: pca9555@20 {
-						compatible = "nxp,pca9555";
-						interrupt-parent = <&gpio2>;
-						interrupts = <19 0x2>;
-						gpio-controller;
-						#gpio-cells = <2>;
-						interrupt-controller;
-						#interrupt-cells = <2>;
-						reg = <0x20>;
-					};
-				};
-			};
-
 			usbphy1: usbphy@...7e000 {
 				status = "okay";
 			};
@@ -366,6 +334,60 @@
 		rotary-encoder,relative-axis;
 	};
 
+	i2c1gpio: i2c@0 {
+		compatible = "i2c-gpio";
+		pinctrl-0 = <&i2c1_pins_cfa10049>;
+		pinctrl-names = "default";
+		gpios = <
+			&gpio3 17 0 /* sda */
+			&gpio3 16 0 /* scl */
+			 >;
+		i2c-gpio,delay-us = <2>;	/* ~100 kHz */
+	};
+
+	i2cmux {
+		compatible = "i2c-mux-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		mux-gpios = <&gpio1 22 0 &gpio1 23 0>;
+		i2c-parent = <&i2c1gpio>;
+
+		i2c@0 {
+			reg = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@1 {
+			reg = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@2 {
+			reg = <2>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		i2c@3 {
+			reg = <3>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			pca9555: pca9555@20 {
+				compatible = "nxp,pca9555";
+				interrupt-parent = <&gpio2>;
+				interrupts = <19 0x2>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				interrupt-controller;
+				#interrupt-cells = <2>;
+				reg = <0x20>;
+			};
+		};
+	};
+
 	backlight {
 		compatible = "pwm-backlight";
 		pwms = <&pwm 3 5000000>;
-- 
1.8.1.2

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