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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAAQKjZMhovKLxNfnXnbF-6diM2zF1cWyi+xHGyL3v83vBh4p6g@mail.gmail.com>
Date:	Fri, 4 Oct 2013 11:05:48 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Olof Johansson <olof@...om.net>
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

2013/10/4 Olof Johansson <olof@...om.net>:
> 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."
>

I still think the pin could be replaced with a regulator. But
lvds-bridge node has "powerdown-gpio" property - it say this board
will use gpio pin - specific to board.  So it seems no problem.

>
>
> -Olof
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/