On 09/10/18, A.s. Dong wrote: > > -----Original Message----- > > From: Shawn Guo [mailto:shawnguo@xxxxxxxxxx] > > Sent: Monday, October 8, 2018 2:21 PM > > To: Oliver Graute <oliver.graute@xxxxxxxxx> > > Cc: devicetree@xxxxxxxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; dl-linux-imx > > <linux-imx@xxxxxxx>; Fabio Estevam <fabio.estevam@xxxxxxx>; Anson > > Huang <anson.huang@xxxxxxx> > > Subject: Re: Can't set MX6UL_PAD_LCD_DATA10 register with devicetree > > > > Copy NXP folks and list. > > > > On Fri, Oct 05, 2018 at 02:45:19PM +0200, Oliver Graute wrote: > > > Hello list, > > > > > > I try to set the following PAD in my imx6ul devicetree (derived from > > > imx6ul-14x14-evk.dts) > > > > > > MX6UL_PAD_LCD_DATA10__GPIO3_IO15 0x100b0 > > > > > > but after kernel compiling and booting the register value is not > > > changed. A readout with devmem2 show me the wrong value. > > > > > > devmem2 0x020E03CC > > > /dev/mem opened. > > > Memory mapped at address 0x76fc4000. > > > Read at address 0x020E03CC (0x76fc43cc): 0x000010B0 > > > > > > Setting the register manually with devmem2 just works fine. > > > > > > /usr/bin/devmem2 0x020E03CC w 0x000100B0 > > > > > > other PADs like MX6UL_PAD_GPIO1_IO07__ENET1_MDC I could configure via > > > the imx6ul devicetree. > > > > > > ideas what I'm doing wrong here? > > > > > I tested imx6ul evk with Shawn's for next tree by manual change LCD_DATA10 > Pad set to 0x100b0, but did not reproduced your issue. > > As I don't have devme2 tool in my rootfs, so I tried memtool in NXP released rootfs. > root@imx6ul7d:~# /unit_tests/memtool -32 0x20e03cc 1 > E > Reading 0x1 count starting at address 0x020E03CC > > 0x020E03CC: 000100B0 > > I guess you can debug the issue with below approaches: > 1) use below cmd to dump pad setting via pinctrl sysfs > cat /sys/kernel/debug/pinctrl/20e0000.iomuxc/pinconf-pins | grep LCD_DATA10 > 2) Enable CONFIG_DEBUG_PINCTRL will make the booting dump all pad settings > in register value. Then you may find some clue on it. thx for this hint. I didn't know this CONFIG_DEBUG_PINCTRL option before. In my dmesg output I now see all the PAD settings. Best regards, Oliver
