[Linux-stm32] [PATCH] pinctrl: stm32: add lock mechanism for irqmux selection

[Linus Walleij]

On Fri, May 10, 2019 at 9:43 AM Alexandre Torgue
<alexandre.torgue at st.com> wrote:

> GPIOs are split between several banks (A, B, ...) and each bank can have
> up to 16 lines. Those GPIOs could be used as interrupt lines thanks to
> exti lines. As there are only 16 exti lines, a mux is used to select which
> gpio line is connected to which exti line. Mapping is done as follow:
>
> -A0, B0, C0.. -->exti_line_0 (X0 selected by mux_0)
> -A1, B1, C1.. -->exti_line_1 (X1 selected by mux_1)
> ...
>
> This patch adds a protection to avoid overriding on mux_n for exti_line_n.
>
> Signed-off-by: Alexandre Torgue <alexandre.torgue at st.com>

Patch applied, can't say I fully understand it but you know what
you're doing!

Yours,
Linus Walleij