linux-kernel - Re: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver

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Date:	Thu, 3 Oct 2013 11:01:30 -0700
From:	Olof Johansson <olof@...om.net>
To:	Inki Dae <inki.dae@...sung.com>
Cc:	Sean Paul <seanpaul@...omium.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver

On Thu, Oct 3, 2013 at 10:39 AM, Inki Dae <inki.dae@...sung.com> wrote:
> 2013/10/3 Sean Paul <seanpaul@...omium.org>:
>> On Thu, Oct 3, 2013 at 9:55 AM, Inki Dae <inki.dae@...sung.com> wrote:
>>> Can a regulator be used instead of gpio in other board case?
>>>
>>
>> No, not to my knowledge.
>>
>
> Hm.. plz check it out again. the gpio pin is specific to board, and
> the the gpio be used as power source trigger could be replaced with a
> regulator according to board design. So you should consider all
> possibilities even though there are no other cases yet: other board
> could  use a regulator instead.

Take a look at the data sheet, it is publicly available.

PD_N is not a power supply input, so modelling it as a regulator makes no sense:

"If PD_N is LOW, then the device is in Deep power-down completely,
even if supply rail is ON; for the device to be able to operate, the
PD_N pin must be HIGH."



-Olof
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