Messages in this thread | | | Date | Wed, 7 Dec 2022 12:25:53 +0100 | From | Jonathan Neuschäfer <> | Subject | PXA25x: GPIO driver fails probe due to resource conflict with pinctrl driver |
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Hello,
I am currently trying to bring up Linux 6.1-rcX on a PXA255 board, using a devicetree. One problem I encountered is that the PXA GPIO driver fails to probe because it uses the same MMIO register range as the pinctrl driver:
[ 0.666169] pxa25x-pinctrl 40e00054.pinctrl: initialized pxa2xx pinctrl driver [ 0.694407] pxa-gpio 40e00000.gpio: can't request region for resource [mem 0x40e00000-0x40e0ffff] [ 0.695050] pxa-gpio: probe of 40e00000.gpio failed with error -16
Before I try to fix this myself: Is GPIO on PXA25x currently expected to work and when has it last been seen working?
What would be a good way to fix this?
I've considered calling into pinctrl-pxa25x directly from pxa-gpio and passing in the GPIO driver's register mapping, rather than mapping the registers again in pinctrl-pxa25x. This seems like it should address the kernel's requirement that resources shouldn't overlap, but some additional locking between GPIO driver and pinctrl driver might be neccessary to keep register accesses consistent/atomic.
Best regards, Jonathan [unhandled content-type:application/pgp-signature] | |