From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawnguo@kernel.org (Shawn Guo) Date: Sat, 14 Oct 2017 23:16:27 +0800 Subject: [PATCH] ARM: dts: imx6ul-14x14-evk: switch lcdif pixel clock to video pll In-Reply-To: <20171012133019.17086-1-p.zabel@pengutronix.de> References: <20171012133019.17086-1-p.zabel@pengutronix.de> Message-ID: <20171014151626.GR8833@dragon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Oct 12, 2017 at 03:30:19PM +0200, Philipp Zabel wrote: > By default, the lcdif_pre_sel mux is switched to the pll3_pfd1_540m PFD > source. If this mux is allowed to propagate rate changes to its parent, > setting the LCDIF pixel clock rate to 9 MHz, as required by the LCD > panel, will cause the pll3_pfd1_540m PFD to be switched away from its > nominal rate to 288 MHz. > This has no negative side effects, as there are no other children to > this PFD. Still, to avoid surprises, it might be preferrable to switch > to the designated video PLL (pll5_video_div) as clock source for the > LCDIF pixel clock. > > Signed-off-by: Philipp Zabel