linux-kernel - Re: [PATCH v2] pwm-backlight: fix the panel power sequence

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Message-ID: <1446548924.3373.3.camel@pengutronix.de>
Date:	Tue, 03 Nov 2015 12:08:44 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	YH Huang <yh.huang@...iatek.com>
Cc:	linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
	Jingoo Han <jingoohan1@...il.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-kernel@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	yingjoe.chen@...iatek.com, Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] pwm-backlight: fix the panel power sequence

Hi YH,

Am Dienstag, den 03.11.2015, 16:11 +0800 schrieb YH Huang:
> > The reasoning is that devices where there is no phandle link pointing to
> > the backlight (for example from a simple-panel node), we should keep the
> > current default behaviour (enable during probe).
> 
> I have a little problem for the current default behaviour.
> Should we enable during probe?

Here I mean enabling the backlight (at the end of the probe function),
not enabling the GPIO already when requesting it.

> Before this patch ( http://patchwork.ozlabs.org/patch/324690/ ),
> we disable "enable-gpio" in the probe function.

While before this patch the GPIO would be initialized in the disabled
state, the call to backlight_update_status at the end of the probe
function would still enable the backlight afterwards.

regards
Philipp

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