linux-kernel - Re: [PATCH 3/5] ARM: dts: dra7-evm: Add extcon nodes for USB

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Date:	Tue, 20 Jan 2015 13:02:09 -0600
From:	Felipe Balbi <balbi@...com>
To:	Roger Quadros <rogerq@...com>
CC:	<balbi@...com>, <tony@...mide.com>, <myungjoo.ham@...sung.com>,
	<cw00.choi@...sung.com>, <george.cherian@...com>, <nsekhar@...com>,
	<devicetree@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] ARM: dts: dra7-evm: Add extcon nodes for USB

On Mon, Jan 19, 2015 at 07:52:20PM +0200, Roger Quadros wrote:
> 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/dra7-evm.dts | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
> index 10b725c..47d9a06 100644
> --- a/arch/arm/boot/dts/dra7-evm.dts
> +++ b/arch/arm/boot/dts/dra7-evm.dts
> @@ -26,6 +26,16 @@
>  		regulator-max-microvolt = <3300000>;
>  	};
>  
> +	extcon_usb1: extcon_usb1 {
> +		compatible = "linux,extcon-usb";
> +		id-gpio = <&pcf_gpio_21 1 GPIO_ACTIVE_HIGH>;
> +	};
> +
> +	extcon_usb2: extcon_usb2 {
> +		compatible = "linux,extcon-usb";
> +		id-gpio = <&pcf_gpio_21 2 GPIO_ACTIVE_HIGH>;
> +	};
> +
>  	vtt_fixed: fixedregulator-vtt {
>  		compatible = "regulator-fixed";
>  		regulator-name = "vtt_fixed";
> @@ -391,6 +401,19 @@
>  			};
>  		};
>  	};
> +
> +	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>;
> +	};
> +
>  };
>  
>  &i2c2 {
> @@ -520,6 +543,14 @@
>  	};
>  };
>  
> +&omap_dwc3_1 {
> +	extcon = <&extcon_usb1>;
> +};
> +
> +&omap_dwc3_2 {
> +	extcon = <&extcon_usb2>;
> +};
> +
>  &usb1 {
>  	dr_mode = "peripheral";
>  	pinctrl-names = "default";
> -- 
> 2.1.0
> 

-- 
balbi

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