linux-kernel - Re: [PATCH v2 3/3] ARM: dts: dra7-evm: Add extcon nodes for USB ID pin detection

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Date:	Wed, 28 Aug 2013 18:40:38 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	George Cherian <george.cherian@...com>
CC:	balbi@...com, myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, grant.likely@...aro.org,
	rob@...dley.net, ian.campbell@...rix.com, swarren@...dotorg.org,
	mark.rutland@....com, pawel.moll@....com, rob.herring@...xeda.com,
	linux-omap@...r.kernel.org, linux-usb@...r.kernel.org,
	bcousson@...libre.com, davidb@...eaurora.org, arnd@...db.de,
	swarren@...dia.com, popcornmix@...il.com
Subject: Re: [PATCH v2 3/3] ARM: dts: dra7-evm: Add extcon nodes for USB ID
 pin detection

Hello.

On 08/28/2013 05:59 PM, George Cherian wrote:

> Add
> 	-extcon nodes for USB ID pin detection.
> 	-i2c nodes.
> 	-pcf nodes to which USB ID pin is connected.

> Signed-off-by: George Cherian <george.cherian@...com>
> ---
>   arch/arm/boot/dts/dra7-evm.dts | 52 +++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 51 insertions(+), 1 deletion(-)

> diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts
> index acd3c09..9ee97c0 100644
> --- a/arch/arm/boot/dts/dra7-evm.dts
> +++ b/arch/arm/boot/dts/dra7-evm.dts
> @@ -17,6 +17,17 @@
>   		device_type = "memory";
>   		reg = <0x80000000 0x60000000>; /* 1536 MB */
>   	};
> +
> +	extcon1: gpio_usbvid_extcon1 {
> +		compatible = "ti,gpio-usb-id";
> +		gpios = <&pcf_21 1 0>;
> +	};
> +
> +	extcon2: gpio_usbvid_extcon2 {
> +		compatible = "ti,gpio-usb-id";
> +		gpios = <&pcf_21 2 0>;
> +	};
> +
>   };
>
>   &dra7_pmx_core {
> @@ -33,10 +44,49 @@
>           };
>   };
>
> +&i2c1 {
> +	clock-frequency = <400000>;
> +
> +	pcf_20: pcf8575@20 {

    Acorrding to the ePAPR spec [1], "the name of a node should be somewhat 
generic, reflecting the function of the device and not its precise 
programming model. If appropriate, the name should be one of the following 
choices:

[...]
- gpio
[...]"

> +		compatible = "ti,pcf8575";
> +		reg = <0x20>;
> +		n_latch = <0x4000>;
> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		interrupt-parent = <&gpio6>;
> +		interrupts = <11 2>;
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +	};
> +
> +	pcf_21: pcf8575@21 {

    Same comment here.

> +		compatible = "ti,pcf8575";
> +		reg = <0x21>;
> +		n_latch = <0x1408>;
> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		interrupt-parent = <&pcf_20>;
> +		interrupts = <14 2>;
> +		interrupt-controller;
> +		#interrupt-cells = <2>;
> +	};
> +
> +};
> +

[1] http://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.0.pdf

WBR, Sergei

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