From mboxrd@z Thu Jan 1 00:00:00 1970 From: broonie@opensource.wolfsonmicro.com (Mark Brown) Date: Sat, 7 Jan 2012 17:28:28 +0000 Subject: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset In-Reply-To: References: <1325778146-27056-1-git-send-email-thomas.abraham@linaro.org> <4F05F509.6020405@metafoo.de> <20120106064929.GB3496@opensource.wolfsonmicro.com> Message-ID: <20120107172826.GA355@opensource.wolfsonmicro.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Sat, Jan 07, 2012 at 04:34:34PM +0530, Thomas Abraham wrote: > On 6 January 2012 12:19, Mark Brown wrote: > > In principle it should be specified in both places to account for shared > > supplies though for all practical purposes for an LCD panel I can't see > > multiple users sharing the same regulator and varying the voltage at > > runtime. > It is assumed here that the boot loader as not set the output voltage > of the regulator that supports variable voltage ranges. So these > values help in setting up the regulator for LCD display. Remember that the regulator API won't allow consumers to configure voltages unless there are constraints granting permission. Users will need to set both the LCD vales and the regulator constraints values to actually allow configuration to happen.