linux-kernel - Re: [PATCH] pinctrl: stm32: add lock mechanism for irqmux selection

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Message-ID: <CACRpkdZ4P=PSCu86p48nBPeVk-h5T0Ytc1CYV3XZGd4fLuJLGw@mail.gmail.com>
Date:   Fri, 24 May 2019 13:26:14 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alexandre Torgue <alexandre.torgue@...com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] pinctrl: stm32: add lock mechanism for irqmux selection

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

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

Yours,
Linus Walleij