Hi, thank you very much! It works now. I totally forgot to enable ldo3 and ldo4:) I am using my custom board and i want to migrate from legacy 3.4 to mainline.
Thanks, Milos четвртак, 09. јул 2020. 19.06.05 UTC+2, Chen-Yu Tsai је написао/ла: > > Hi, > > On Fri, Jul 10, 2020 at 12:51 AM Milos Ladni <[email protected] > <javascript:>> wrote: > > > > Hi, > > > > I am using mainline kernel on my A20 board and can not get GPIO working > for some ports. > > I tested them through standard sysfs and for pin number id i used next : > (position of letter in alphabet - 1) * 32 + pin number > > I tried with PE0, PE1, PE2, and PE4, i think that whole PE port does not > work. Pin is exported in /sys/class/gpioX and direction is set to 'out' but > when i write 1 or 0 to value nothing happens (actually it changed value for > 0.2~0.4V between logical 0 and 1). Pin numbers for that port was > (5-1)*32+pinNumber => 128 + pinNumber. > > In dtsi for A20 port E is by default intendent for CSI0 but CSI0 is not > enabled in my case and i also tried to completly remove SCI0 from linux > kernel and comment pin confiruration for CSI0 in dtsi file but it still > does not works. > > I noticed this issue because i use LVDS display and my display standby > pin is connected to PE2. > > After system is started i can login normally. After ~10 seconds i can > see only this message in dmesg: > > > > [ 27.180481] random: crng init done > > [ 31.896048] vcc3v0: disabling > > [ 31.899038] vcc5v0: disabling > > [ 31.902015] ldo3: disabling > > [ 31.905150] ldo4: disabling > > [ 31.908346] ahci-5v: disabling > > [ 31.911416] usb0-vbus: disabling > > [ 31.914644] usb1-vbus: disabling > > > > After this message PE2 goes to LOW and never come back to HIGH level. > > I also tried to completelly remove my LVDS display and i got the same > behavior for all pins on PE port. > > I also tried to connect PE2 to pull-up 3V3 through 10k resistor but > without success. After ~30 seconds after i turn on device PE2 goes LOW > forever. > > Interesting part is that when it is HIGH it is 2.8, not 3.3V. Maybe i > missed some configuration in dts file. > > What board are you using? > > Any board based on Allwinner's reference design will use one of the > LDOs at 2.8V to power the > PE and PG pin groups. This is because the two pingroups are almost > exclusively used for camera > sensors, which a lot of use 2.8V I/O levels. Now if you don't have > power for the pingroups, > i.e. the LDOs are off, then of course the pins don't work. > > First check your schematics to see if that's the case. Then you need > to properly wire up > pin power supplies using the vcc-pX-supply properties in the pinctrl > node. See other newer > boards for how that works. > > ChenYu > > > Also tried PG1 and does not works. > > Tried PH18, PH21 and it works. > > Tried PB14 and it works. > > Another ports i did not tried. > > > > Interesting part is that because i enegled gpio debug in kernel setup i > always get message "gpio gpiochip0: Persistence not supported for GPIO XXX" > does not matter if if it is PE port which does not work or PH port which > works. > > > > Can someone check this issue or check my dts files? > > > > Thank you, > > Milos Ladicorbic > > > > -- > > You received this message because you are subscribed to the Google > Groups "linux-sunxi" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > To view this discussion on the web, visit > https://groups.google.com/d/msgid/linux-sunxi/3526d3a3-64ae-403c-9fa1-8507bfd693f1o%40googlegroups.com. > > > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/da353c0a-2623-401e-816d-d1956b866aa5o%40googlegroups.com.
