[Linux-stm32] STM32MP151A sysfs

[Alexandre TORGUE]

Hi Kegl

On 6/15/22 07:41, Kegl Rohit wrote:
> Hello!
> 
> I could notice following issue with kernel version 5.10.61:
> Exporting GPIO PB12 and PD12 via sysfs triggers a kernel ERROR.
> After the error happend the gpio still got exported and seem to function.
> 
> Both Pins are unclaimed:
> grep -e PB12 -e PD12
> /sys/kernel/debug/pinctrl/soc\:pin-controller at 50002000/pinmux-pins
> pin 28 (PB12): UNCLAIMED
> pin 60 (PD12): UNCLAIMED
> 
> root at dev:/sys/class/gpio# echo 60 > export
> root at dev:/sys/class/gpio# echo 28 > export
> [   30.467370] stm32mp157-pinctrl soc:pin-controller at 50002000: irq
> line 12 already requested.
> 
> The order does not matter:
> root at dev:/sys/class/gpio# echo 60 > export
> root at dev:/sys/class/gpio# echo 28 > export
> [   20.768493] stm32mp157-pinctrl soc:pin-controller at 50002000: irq
> line 12 already requested.
> 
> This is the dev_err code part:
> https://github.com/STMicroelectronics/linux/commit/8eb2dfee9fb1277f635ce369ef8669df0ec421bc#diff-549d83503a258940ffa6617dbbf4859d463fcac94f376b45b1744d243ffe9b16R381
> 
> Seems that gpio sysfs requests an IRQ every time and there is some
> shared IRQ limitation which is not implemented / handled yet.
> 
> Can someone reproduce this? Maybe it is only a usage / kernel /
> devicetree setup error by me...
> Or is this a STM32MP1 limitation? gpio sysfs bug with STM32MP1? ...
> 

I just do the test on my DK2 board. I'm not able to reproduce (even if I 
add a gio-keys using the EXTI line 12).

Which STM32MP151 do you use ?

regards
Alex



> 
> Thanks in advance.
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