From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Date: Wed, 14 Oct 2015 12:55:52 +0000 Subject: Re: [PATCH] ARM: shmobile: defconfig: enable HDMI output for RCar Message-Id: <2387256.Snyt0kyd3C@avalon> List-Id: References: <1407974835-11064-1-git-send-email-khilman@linaro.org> In-Reply-To: <1407974835-11064-1-git-send-email-khilman@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org On Wednesday 14 October 2015 19:11:12 Khiem Nguyen wrote: > On 10/14/2015 3:22 PM, Geert Uytterhoeven wrote: > > On Wed, Oct 14, 2015 at 10:09 AM, Magnus Damm wrote: > >>> Or do you mean disabling them upfront? > >>> There are some clocks that must not be disabled. Some of them are not > >>> documented. > >> > >> Disabling them upfront with sparse documentation seems fun, but also a > >> bit like asking for trouble. =) > > > > I have hackish code that does it for all boards I have, and use it > > actively. > > > >> So disabling clocks upfront may be a troublesome but good way to > >> trigger incorrect dependencies, and unless I'm mistaken it should give > >> the same behaviour as the updated u-boot version, right? > > > > More or less (U-Boot still keeps a few enabled for its own use, e.g. > > Ethernet). > > AFAIK, in some recent versions of Gen2 BSP, all the devices (including > all devices enabled by u-boot for its processing, like Ethernet, TMU, > serial) will be turned off right before jumping to kernel start address. Would it make sense to keep the serial port enabled in order to support early printk ? -- Regards, Laurent Pinchart