Hi, On Wednesday, 04.04.2018 at 14:07, Andre Przywara wrote: > Ah, interesting, but would make some sense: PG9 is pulled high on the > board, so you have to actively drive it *low* to *disable* the power. > Do you have some nodes for the WiFi/BT module in the DT? The UART1 CTS > is also on PG9, and we bundle it with the RTS pin in one group. RTS is > used by the BT module, but CTS is not. > So as soon as we initialise UART1, we might accidentally pull that line > low and disable USB power.
I've since upgraded to mainline v4.16.0 with the DT changes from your olinuxino Github branch, plus the additional change adding dr_mode = "otg" to the &usb_otg node. In the DT [1] there are some nodes referring to "wifi_pwrseq" (L61, L117), a "wifi@1" (L122) and a "vcc-wifi-io" (L225). I don't understand enough of the syntax to know if these are what you're asking about? [1] https://github.com/apritzel/linux/blob/f1827ce503ca19e6873847128f86849788cfc7db/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts For reference, I've uploaded a full dmesg of this kernel booting, here: https://gist.github.com/mato/96bfaf3a99a824024c0f27e76d99bc63 > Ah, yes, you need CONFIG_GPIO_SYSFS in your .config. You can use any > other userland tool to manipulate GPIOs, though. > You may also try to use U-Boot's "gpio" command, though I am not sure > that works on the A64 at the moment. Possibly today's sunxi/master > U-Boot branch would fix this. Adding CONFIG_GPIO_SYSFS gives me the sysfs directory, but the "export" does not work: root@olinuxino:/# cd /sys/class/gpio root@olinuxino:/sys/class/gpio# ls -l total 0 --w------- 1 root root 4096 Nov 3 17:17 export lrwxrwxrwx 1 root root 0 Nov 3 17:16 gpiochip0 -> ../../devices/platform/soc/1c20800.pinctrl/gpio/gpiochip0 lrwxrwxrwx 1 root root 0 Nov 3 17:16 gpiochip352 -> ../../devices/platform/soc/1f02c00.pinctrl/gpio/gpiochip352 --w------- 1 root root 4096 Nov 3 17:16 unexport root@olinuxino:/sys/class/gpio# echo 201 > export -bash: echo: write error: Device or resource busy Cheers, -mato -- 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]. For more options, visit https://groups.google.com/d/optout.
