Re: [PATCH 0/5 RfC] pintrl: meson: add support for GPIO IRQs

[Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

On Sun, May 7, 2017 at 6:19 PM, Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> This patch series is partially based on a series Jerome Brunet
> submitted about half a year ago. Due to open questions this series never
> made it to mainline, see https://patchwork.kernel.org/patch/9384431/
>
> This new attempt uses GPIOLIB_IRQCHIP resulting in less needed code.
> Included is also support for using two parent IRQs in case
> of IRQ_TYPE_EDGE_BOTH, like in the vendor driver.
>
> Worth to be mentioned is also that I had to work around a strange
> issue with spurious interrupts resulting in a deadlock.
> The affected critical section in __setup_irq is executed with interrupts
> disabled, nevertheless spurious GPIO IRQs result in a deadlock what
> seems to indicate that they are handled on the same CPU.
> I didn't find a better explanation than a possible HW flaw so far.
>
> The series was successfully tested on a Odroid-C2, e.g. with removing
> polling for SD card insertion/removal from the mmc driver.
>
> Heiner Kallweit (5):
>   pinctrl: meson: add interrupts to pinctrl data
>   pinctrl: meson: document GPIO IRQ DT binding
>   pinctrl: meson: add DT node for GPIO IRQ on Meson GX
>   pinctrl: meson: add DT node for GPIO IRQ on Meson 8 / 8b
>   pinctrl: meson: add support for GPIO interrupts

I just merged a bunch of patches from Martin Blumenstigl for this driver.

Martin can you help out reviewing these patches?

Yours,
Linus Walleij
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