linux-kernel - Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off

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Message-id: <53453F2E.40606@samsung.com>
Date:	Wed, 09 Apr 2014 14:38:06 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	kishon <kishon@...com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio
 on/off

Hi,

On 09.04.2014 14:24, Vivek Gautam wrote:
> Hi Sylwester,
>
>
> On Wed, Apr 9, 2014 at 5:41 PM, Sylwester Nawrocki
> <s.nawrocki@...sung.com> wrote:
>> Hi Vivek,
>>
>> On 09/04/14 13:54, Vivek Gautam wrote:
>>> Adding support to enable/disable VBUS hooked to a gpio
>>> to enable vbus supply on the port.
>>
>> Does the GPIO control a fixed voltage regulator ? If so, shouldn't
>> it be modelled by the regulator API instead ?
>
> No, this GPIO controls a 'current limiting power distribution switch',
> which gives the output vbus to usb controller.
> Should i model this as a fixed regulator ?

If I understand this correctly, this is just a switch that lets you 
control whether vbus is provided to the USB connector or not. If so, 
this doesn't look like an Exynos-specific thing at all and should rather 
be modeled on higher level.

Best regards,
Tomasz
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