From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans de Goede Date: Sun, 11 Oct 2015 13:17:52 +0200 Subject: [U-Boot] [PATCH 4/7] sunxi: power: Change A23/A33 VDD-SYS default from 1.2V to 1.1V In-Reply-To: References: <1443882383-21181-1-git-send-email-hdegoede@redhat.com> <1443882383-21181-4-git-send-email-hdegoede@redhat.com> Message-ID: <561A4560.2000709@redhat.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi, On 10-10-15 16:13, Chen-Yu Tsai wrote: > On Sat, Oct 3, 2015 at 10:26 PM, Hans de Goede wrote: >> Change the axp223 dcdc2 / VDD-SYS default from 1.2V to 1.1V, 1.1V is the >> value recommended by Allwinner and is what most fex files specify. >> >> This has been tested on a number of A23/A33 tablets including on an >> A23 Ippo-q8h-v1.2 PCB tablet which has a fex file which specifies 1.2V >> (which is where our original 1.2V default comes from). >> >> Signed-off-by: Hans de Goede > > We should also be able to drop the VDD-SYS voltage for A31/A31s, which is > from DCDC4, as well. The fex files do not agree with you all A31 fex files have it at either 1200 or 1240 mV. > Furthermore, DCDC2 on AXP221/sun6i is normally powering the GPU, > in spite of the reference design using it for the CPU. Right, the Kconfig help for DCDC2 already contains: On A31 boards dcdc2 is used for VDD-GPU and should be 1.2V. Regards, Hans