linux-kernel - Re: [PATCH v2] pwm-backlight: Avoid backlight flicker when probed from DT

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Date:	Wed, 26 Aug 2015 12:58:56 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v2] pwm-backlight: Avoid backlight flicker when probed
 from DT

On Wed, 26 Aug 2015, Philipp Zabel wrote:

> Hi Thierry, Jingoo, Lee,
> 
> Am Donnerstag, den 30.07.2015, 19:22 +0200 schrieb Philipp Zabel:
> > If the driver is probed from the device tree, and there is a phandle
> > property set on it, and the enable GPIO is already configured as output,
> > and the backlight is currently disabled, keep it disabled.
> > If all these conditions are met, assume there will be some other driver
> > that can enable the backlight at the appropriate time.
> 
> do you have any comments on this?
> 
> This patch fixes premature backlight illumination issues for DT probed
> devices with enable gpio or regulator without changing the behavior of
> the non-DT case or DT cases where the enable gpio and regulator are kept
> initially enabled or where no other device node points to the backlight
> via phandle.

I need Thierry's review to move forward on this.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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