From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Thu, 5 Dec 2013 10:40:07 -0800 Subject: [PATCH] ARM: DTS: omap4-sdp: Add regulator for LCD backlight (pwm-backlight) In-Reply-To: <5297164D.9060400@ti.com> References: <1385630924-16392-1-git-send-email-peter.ujfalusi@ti.com> <5297164D.9060400@ti.com> Message-ID: <20131205184007.GE26766@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Sourav Poddar [131128 02:10]: > On Thursday 28 November 2013 02:58 PM, Peter Ujfalusi wrote: > >Since in DT booted kernel dummy regulators are no longer supported we need > >to provide valid phandle for the regulator needed by the backlight. > >On the board VBAT is used to power the LCD backlight(s). > > > >Signed-off-by: Peter Ujfalusi > >--- > >Hi, > > > >This patch is needed for 3.13 to get the LCD backlight to work again. > Is this usage of power supply a mandatory requirement? > > There is a thread which discusses this issue[1]: > http://www.spinics.net/lists/arm-kernel/msg288215.html > > According to the above, regulator framework have support in 3.13-rc1 > to returns > a dummy regulator if there is none specified in the dts data. > Thierry told that there seems to be a bug in regulator in handling > these case. > > Though, I also posted a patch on pwm a couple of days ago[2] > [2]: https://patchwork.kernel.org/patch/3246711/ > > I posted it without "power-supply" by testing it with the > solution proposed in [1]. > If I dont use the solution[1], it fails for me also. Hmm so if this is not needed, I'll mark this thread as read in my inbox. If you guys need it please repost. Regards, Tony