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[PATCH v8 11/34] ARM: dts: imx6-sabreauto: create i2cmux for i2c3

From Steve Longerbeam <slongerbeam@gmail.com>
Newsgroups linux.kernel
Subject [PATCH v8 11/34] ARM: dts: imx6-sabreauto: create i2cmux for i2c3
Date 2017-06-07 20:40 +0200
Message-ID <tPO27-1PO-49@gated-at.bofh.it> (permalink)
References <tPO26-1PO-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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The sabreauto uses a steering pin to select between the SDA signal on
i2c3 bus, and a data-in pin for an SPI NOR chip. Use i2cmux to control
this steering pin. Idle state of the i2cmux selects SPI NOR. This is not
a classic way to use i2cmux, since one side of the mux selects something
other than an i2c bus, but it works and is probably the cleanest
solution. Note that if one thread is attempting to access SPI NOR while
another thread is accessing i2c3, the SPI NOR access will fail since the
i2cmux has selected the SDA pin rather than SPI NOR data-in. This couldn't
be avoided in any case, the board is not designed to allow concurrent
i2c3 and SPI NOR functions (and the default device-tree does not enable
SPI NOR anyway).

Devices hanging off i2c3 should now be defined under i2cmux, so
that the steering pin can be properly controlled to access those
devices. The port expanders (MAX7310) are thus moved into i2cmux.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
---
 arch/arm/boot/dts/imx6qdl-sabreauto.dtsi | 65 +++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 21 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
index a2a714d..c8e35c4 100644
--- a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
@@ -108,6 +108,44 @@
 		default-brightness-level = <7>;
 		status = "okay";
 	};
+
+	i2cmux {
+		compatible = "i2c-mux-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_i2c3mux>;
+		mux-gpios = <&gpio5 4 0>;
+		i2c-parent = <&i2c3>;
+		idle-state = <0>;
+
+		i2c@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+
+			max7310_a: gpio@30 {
+				compatible = "maxim,max7310";
+				reg = <0x30>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+
+			max7310_b: gpio@32 {
+				compatible = "maxim,max7310";
+				reg = <0x32>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+
+			max7310_c: gpio@34 {
+				compatible = "maxim,max7310";
+				reg = <0x34>;
+				gpio-controller;
+				#gpio-cells = <2>;
+			};
+		};
+	};
 };
 
 &clks {
@@ -290,27 +328,6 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_i2c3>;
 	status = "okay";
-
-	max7310_a: gpio@30 {
-		compatible = "maxim,max7310";
-		reg = <0x30>;
-		gpio-controller;
-		#gpio-cells = <2>;
-	};
-
-	max7310_b: gpio@32 {
-		compatible = "maxim,max7310";
-		reg = <0x32>;
-		gpio-controller;
-		#gpio-cells = <2>;
-	};
-
-	max7310_c: gpio@34 {
-		compatible = "maxim,max7310";
-		reg = <0x34>;
-		gpio-controller;
-		#gpio-cells = <2>;
-	};
 };
 
 &iomuxc {
@@ -418,6 +435,12 @@
 			>;
 		};
 
+		pinctrl_i2c3mux: i2c3muxgrp {
+			fsl,pins = <
+				MX6QDL_PAD_EIM_A24__GPIO5_IO04 0x0b0b1
+			>;
+		};
+
 		pinctrl_pwm3: pwm1grp {
 			fsl,pins = <
 				MX6QDL_PAD_SD4_DAT1__PWM3_OUT		0x1b0b1
-- 
2.7.4

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[PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 28/34] media: imx: csi: add frame skipping support Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 11/34] ARM: dts: imx6-sabreauto: create i2cmux for i2c3 Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 26/34] media: imx: csi: add support for bayer formats Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 31/34] media: imx: capture: add frame sizes/interval enumeration Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 25/34] media: imx: Add MIPI CSI-2 Receiver subdev driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 32/34] media: imx: set and propagate default field, colorimetry Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 33/34] media: imx: Drop warning upon multiple S_STREAM disable calls Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 30/34] media: imx: csi: add frame size/interval enumeration Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 16/34] platform: add video-multiplexer subdevice driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:40 +0200
  [PATCH v8 09/34] ARM: dts: imx6-sabrelite: add OV5642 and OV5640 camera sensors Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 18/34] media: Add userspace header file for i.MX Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 07/34] ARM: dts: imx6qdl: add capture-subsystem device Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 15/34] add mux and video interface bridge entity functions Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 23/34] media: imx: Add VDIC subdev driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 04/34] ARM: dts: imx6qdl: add multiplexer controls Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 21/34] media: imx: Add Capture Device Interface Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 13/34] ARM: dts: imx6-sabreauto: add pinctrl for gpt input capture Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 06/34] ARM: dts: imx6qdl: Add video multiplexers, mipi_csi, and their connections Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 12/34] ARM: dts: imx6-sabreauto: add reset-gpios property for max7310_b Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 03/34] [media] dt/bindings: Add bindings for OV5640 Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  [PATCH v8 01/34] dt-bindings: Add bindings for video-multiplexer device Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 20:50 +0200
  Re: [PATCH v8 00/34] i.MX Media Driver Hans Verkuil <hverkuil@xs4all.nl> - 2017-06-07 21:10 +0200
    Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-07 21:10 +0200
    Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:20 +0200
    Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:20 +0200
      Re: [PATCH v8 00/34] i.MX Media Driver Hans Verkuil <hverkuil@xs4all.nl> - 2017-06-10 01:30 +0200
        Re: [PATCH v8 00/34] i.MX Media Driver Pavel Machek <pavel@ucw.cz> - 2017-06-10 09:40 +0200
        Re: [PATCH v8 00/34] i.MX Media Driver Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> - 2017-06-11 22:10 +0200
          Re: [PATCH v8 00/34] i.MX Media Driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-12 20:20 +0200
  Re: [PATCH v8 19/34] media: Add i.MX media core driver Philipp Zabel <p.zabel@pengutronix.de> - 2017-06-09 15:20 +0200
    Re: [PATCH v8 19/34] media: Add i.MX media core driver Steve Longerbeam <slongerbeam@gmail.com> - 2017-06-10 01:10 +0200
  Re: [PATCH v8 17/34] [media] add Omnivision OV5640 sensor driver Sakari Ailus <sakari.ailus@iki.fi> - 2017-06-11 00:00 +0200

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