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

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Message-ID: <1446481847.3442.61.camel@pengutronix.de>
Date:	Mon, 02 Nov 2015 17:30:47 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	YH Huang <yh.huang@...iatek.com>,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	linux-pwm@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...gutronix.de
Subject: Re: [PATCH] pwm-backlight: Avoid backlight flicker when probed from
 DT

Hi Lee,

Am Freitag, den 30.10.2015, 18:21 +0000 schrieb Lee Jones:
> > @@ -264,12 +266,32 @@ static int pwm_backlight_probe(struct platform_device *pdev)
> >  		pb->enable_gpio = gpio_to_desc(data->enable_gpio);
> >  	}
> >  
> > +	phandle = of_find_property(pdev->dev.of_node, "phandle", NULL) != NULL;
> 
> This is a little ugly.
> 
> If this is the only way to identify the probedness of a device then
> you probably want to neaten it up a little.  I suggest something along
> the lines of:
>
> if (of_find_property(pdev->dev.of_node, "phandle", NULL))
> 	already_probed = true;
> 
> Also, do you also want to check for "linux,phandle", as this is always
> catered for in drivers/of/*

Thanks for pointing this out. I suppose I should just check
pdev->dev.of_node->phandle != 0 instead. That will already be
initialized by unflatten_dt_node if either property was found.

regards
Philipp

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