linux-kernel - [PATCH v2 4/7] ARM: dts: dra72-evm: Add extcon nodes for USB

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Date:	Mon, 26 Jan 2015 14:15:29 +0200
From:	Roger Quadros <rogerq@...com>
To:	<balbi@...com>, <tony@...mide.com>, <myungjoo.ham@...sung.com>,
	<cw00.choi@...sung.com>
CC:	<george.cherian@...com>, <nsekhar@...com>,
	<devicetree@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Roger Quadros <rogerq@...com>
Subject: [PATCH v2 4/7] ARM: dts: dra72-evm: Add extcon nodes for USB

On this EVM, the USB cable state has to be determined via the
ID pin tied to a GPIO line. We use the gpio-usb-extcon driver
to read the ID pin and the extcon framework to forward
the USB cable state information to the USB driver so the
controller can be configured in the right mode (host/peripheral).

Gets USB peripheral mode to work on this EVM.

Signed-off-by: Roger Quadros <rogerq@...com>
Reviewed-by: Felipe Balbi <balbi@...com>
Acked-by: Felipe Balbi <balbi@...com>
---
 arch/arm/boot/dts/dra72-evm.dts | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/dra72-evm.dts b/arch/arm/boot/dts/dra72-evm.dts
index 89085d0..ce8e243 100644
--- a/arch/arm/boot/dts/dra72-evm.dts
+++ b/arch/arm/boot/dts/dra72-evm.dts
@@ -8,6 +8,7 @@
 /dts-v1/;
 
 #include "dra72x.dtsi"
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "TI DRA722";
@@ -24,6 +25,16 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	extcon_usb1: extcon_usb1 {
+		compatible = "linux,extcon-usb-gpio";
+		id-gpio = <&pcf_gpio_21 1 GPIO_ACTIVE_HIGH>;
+	};
+
+	extcon_usb2: extcon_usb2 {
+		compatible = "linux,extcon-usb-gpio";
+		id-gpio = <&pcf_gpio_21 2 GPIO_ACTIVE_HIGH>;
+	};
 };
 
 &dra7_pmx_core {
@@ -243,6 +254,18 @@
 			ti,palmas-long-press-seconds = <6>;
 		};
 	};
+
+	pcf_gpio_21: gpio@21 {
+		compatible = "ti,pcf8575";
+		reg = <0x21>;
+		lines-initial-states = <0x1408>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-parent = <&gpio6>;
+		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+	};
 };
 
 &uart1 {
@@ -345,6 +368,14 @@
 	phy-supply = <&ldo4_reg>;
 };
 
+&omap_dwc3_1 {
+	extcon = <&extcon_usb1>;
+};
+
+&omap_dwc3_2 {
+	extcon = <&extcon_usb2>;
+};
+
 &usb1 {
 	dr_mode = "peripheral";
 	pinctrl-names = "default";
-- 
2.1.0

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