linux-kernel - Re: [PATCH 0/3] pwm-backlight: add subdrivers & Tegra support

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Date:	Sun, 20 Jan 2013 13:51:53 +0800
From:	Mark Zhang <markz@...dia.com>
To:	Alexandre Courbot <acourbot@...dia.com>
CC:	Thierry Reding <thierry.reding@...onic-design.de>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>
Subject: Re: [PATCH 0/3] pwm-backlight: add subdrivers & Tegra support

On 01/20/2013 01:26 PM, Alexandre Courbot wrote:
> On Sun, Jan 20, 2013 at 12:38 PM, Mark Zhang <markz@...dia.com> wrote:
>> So this is a non power sequence version of backlight & panel enabling,
>> isn't it? I remember we talked about this several days ago and you
>> mentioned kernel guys want an ad-hoc version(power sequence logics
>> inside driver, not in DT) and I believe this is it, right?
> 
> Basically, yes - I still think power-seqs could be useful here
> (especially after seeing the size of these sub-drivers if you want to
> do error checking properly) and plan to give it another shot without
> DT, but this will not happen soon since we need to do some GPIO
> redesign before. You can see what's wrong in the init() function of
> the subdriver: we call a device tree function to obtain the GPIO as
> there is no get function.
>

Okay. I think I got the picture. I'll read the codes when I'm free and I
think I'll understand this better after that.

>> I think finally I can enable Tegra30 cardhu's display after this patch
>> merged.
> 
> Yes, feel free to write a subdriver for Cardhu if you like - I'd like
> to see all T20 and T30 boards supported by the time this gets merged.
> 

Yep, I can try to do that. I'll let you know if I have problems.

Mark
> Thanks,
> Alex.
> 
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