#21892: Oxnas pincontrol (GPIO) does not work
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Reporter: anonymous | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone:
Component: kernel | Version: Trunk
Resolution: | Keywords: oxnas ox820 gpio pincontrol
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Comment (by dangole):
It doesn't look like there are any pins needed to be pulled to enable
communication.
The differences of the pinctrl registers you dumped here hint that the
pins 5, 6, 12, 13, 16, 17, 20, 21, 28 and 29 of bank B are set to
functions other than GPIO. As we don't have a hardware-I2C driver for
oxnas in OpenWrt, the pins used should be set to be GPIO and we use i2c-
gpio to perform bit-banging in software.
In the new pinctrl driver written by Ma Hajun, there are two I/O addresses
for each bank, regbase and ctrlbase. The driver is based on pinctrl-at91.c
and seems hacky, looking at it I consider it likely that there are still
some bugs in there...
But yes, at least in theory, pinctrl-oxnas.c does also set that 5th mask
in
https://dev.openwrt.org/browser/trunk/target/linux/oxnas/files/drivers/pinctrl
/pinctrl-oxnas.c#L488 .
Thanks for sharing the DTS. From a brief look, this is ox820-kd20.dts with
the type and address of the RTC adapted and PCIe disabled. Are the LEDs
and buttons actually the same or did you just leave it there hoping that
it doesn't hurt to switch pins 5, 6, 10 and 11 of bank A to be inputs...
If you want to play more to get a feeling for what you are dealing with,
create pinctrl sections like the one in ox820-pogoplug-pro.dts and attach
it to your i2c-gpio section. then put stuff there and try to use that to
get things to work while checking the actual content of the gpio registers
for orientation.
--
Ticket URL: <https://dev.openwrt.org/ticket/21892#comment:15>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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