From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Courbot Date: Thu, 05 Jul 2012 06:25:44 +0000 Subject: Re: [PATCH] pwm-backlight: add regulator and GPIO support Message-Id: <4FF53368.6090805@nvidia.com> List-Id: References: <1340976167-27298-1-git-send-email-acourbot@nvidia.com> <20120704104840.GJ24458@pengutronix.de> <4FF43692.2040805@nvidia.com> <20120704130056.GC30009@pengutronix.de> <4FF45DDF.9000306@nvidia.com> <20120704152451.GA7333@sirena.org.uk> <4FF4FDC0.8020405@nvidia.com> <20120705062011.GI30009@pengutronix.de> In-Reply-To: <20120705062011.GI30009-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Sascha Hauer Cc: Mark Brown , Thierry Reding , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" On 07/05/2012 03:20 PM, Sascha Hauer wrote: >> Oh, that is a mistake of mine then. Driver probe should continue if >> no regulator is declared (but should fail if some other error >> occured). I want to maintain backward compatibility with current >> users of the driver, so regulator/gpio specification should be >> optional. > > I think the only way doing this is to add a flag to platform_data. I > don't know if that's accepted though. I thought about just checking if devm_get_regulator returned -ENODEV and happily continue if that was the case, assuming no regulator was declared. But anyway with the power sequences specification this problem becomes null, since regulators will have to be explicitly declared anyway. I might be flamed for putting a parser and interpreter into a backlight driver, but I'll take my chances. :) Alex.