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

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Message-ID: <ae00fd9c-d25e-c401-4d21-d526a63538f2@st.com>
Date:   Fri, 24 May 2019 14:27:35 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
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 5/24/19 1:26 PM, Linus Walleij wrote:
> 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!

Thanks :). Do you need a better explanation ?

> 
> Yours,
> Linus Walleij
>