pinctrl: mcp23s08: gpio-keys: Unable to get irq number for GPIO

[Dmitry Mastykin <mastichi@xxxxxxxxx>]

Hello,

when using gpio-keys with mcp23s08, sometimes it fails to get irq numbers:

[   10.236393] gpiochip_setup_dev: registered GPIOs 504 to 511 on
device: gpiochip4 (mcp23008)
[   10.242995] of_get_named_gpiod_flags: parsed 'gpios' property of
node '/keys/button@1[0]' - status (0)
[   10.243759] gpio-keys keys: Unable to get irq number for GPIO 0, error -6

but more often it succeeds (approx. 1:3):

[   10.702204] gpiochip_setup_dev: registered GPIOs 504 to 511 on
device: gpiochip4 (mcp23008)
[   10.731450] of_get_named_gpiod_flags: parsed 'gpios' property of
node '/keys/button@1[0]' - status (0)
[   10.803577] of_get_named_gpiod_flags: parsed 'gpios' property of
node '/keys/button@2[0]' - status (0)
[   10.869131] of_get_named_gpiod_flags: parsed 'gpios' property of
node '/keys/button@3[0]' - status (0)
[   10.928949] of_get_named_gpiod_flags: parsed 'gpios' property of
node '/keys/button@4[0]' - status (0)

Please suggest where could be the problem.
Thank you!

Dmitry Mastykin
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