linux-kernel - Re: [PATCH 1/2] extcon: extcon-dra7xx: Add extcon driver for USB ID detection

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Date:	Wed, 21 Aug 2013 18:36:52 +0530
From:	George Cherian <george.cherian@...com>
To:	Stephen Warren <swarren@...dotorg.org>
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>, <mark.rutland@....com>,
	<pawel.moll@....com>, <rob.herring@...xeda.com>,
	<linux-omap@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<bcousson@...libre.com>
Subject: Re: [PATCH 1/2] extcon: extcon-dra7xx: Add extcon driver for USB
 ID detection

Hi Stephen,

On 8/20/2013 10:23 PM, Stephen Warren wrote:
>> >ID pins are connected to pcf8575, and the pcf8575's interrupt line is
>> >inturn connected to
>> >gpio bank6 pin 11, we use this gpio interrupt to detect the ID pin change.
> In that case, the PCF8575 node needs to be a GPIO controller and an IRQ
> controller, as does the driver for the PCF8575. This binding should have
> a single entry in the gpios property, and the driver can call
> gpio_to_irq() on that so it knows which IRQ to request.

You meant some thing like this?

        pcf_usb: pcf8575@21 {
                 compatible = "ti,pcf8575";
                 reg = <0x21>;
                 gpio-controller;
                 #gpio-cells = <2>;
                 interrupt-parent = <&gpio6>;
                 interrupts = <11 2>;
                 interrupt-controller;
                 #interrupt-cells = <2>;
         };

	 usb_vid_gpio {
                 compatible = "ti,dra7xx-usb";
                 gpios = <&pcf_usb 1 0>;
              
         };


-- 
-George

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