From mboxrd@z Thu Jan 1 00:00:00 1970 From: hdegoede@redhat.com (Hans de Goede) Date: Mon, 21 Dec 2015 13:59:59 +0100 Subject: [linux-sunxi] Re: [PATCH 0/5] ARM: dts: sunxi: Add backlight node to q8 tablets In-Reply-To: References: <1442752251-20744-1-git-send-email-hdegoede@redhat.com> Message-ID: <5677F7CF.3050308@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On 21-12-15 11:56, Silvio Pellicano wrote: > > >> Here is a slightly updated version of Chen-Yu's backlight >> patches, also adding support for the backlight found on A13 >> based q8 tablets. >> > > If i compile your dtsi with (obviously) pwm support enable , backlight > switch off after kernel start, > if i disable pwm in menuconfig,it stay on, all seem correct (pwm on PB2 in > original script.bin), > but there is somewhere a bug in pwm or dtsi description of backlight. No there is not, if you enable the pwm driver you must also enable the backlight-pwm driver / add CONFIG_BACKLIGHT_PWM=y to your .config (and make sure it stays that way after a "make oldconfig"). Regards, Hans