linux-kernel - Re: [PATCH v4 6/9] pinctrl: Add IRQ support to STM32 gpios

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Date:   Thu, 8 Sep 2016 17:47:02 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Bruno Herrera <bruherrera@...il.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v4 6/9] pinctrl: Add IRQ support to STM32 gpios

Hi Linus,

On 09/07/2016 11:06 PM, Linus Walleij wrote:
> On Tue, Sep 6, 2016 at 6:45 PM, Alexandre TORGUE
> <alexandre.torgue@...com> wrote:
>
>> This patch adds IRQ support to STM32 gpios.
>>
>> The EXTI controller has 16 lines dedicated to GPIOs.
>> EXTI line n can be connected to only line n of one of the GPIO ports, for
>> example EXTI0 can be connected to either PA0, or PB0, or PC0...
>> This port selection is done by specifying the port number into System
>> Config registers.
>>
>> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com>
>> Signed-off-by: Alexandre TORGUE <alexandre.torgue@...com>
>
>> +++ b/drivers/pinctrl/stm32/Kconfig
>> @@ -6,6 +6,8 @@ config PINCTRL_STM32
>>         select PINMUX
>>         select GENERIC_PINCONF
>>         select GPIOLIB
>> +       select GPIOLIB_IRQCHIP
>
> But you're not really using GPIOLIB_IRQCHIP. You have a different,
> super-complex irqchip in use.

Thanks Linus for this review. I will send a V5.
Just one question, when you say "super-complex irqchip in use", do you 
mean I could use another (simplest) solution to handle this EXTI controller?

Regards

Alex

>
> So just don't select this.
>
>> +       bank->gpio_chip.irqdomain = irq_domain_create_hierarchy(pctl->domain,
>> +                                       0, STM32_GPIO_IRQ_LINE, bank->fwnode,
>> +                                       &stm32_gpio_domain_ops, bank);
>
> Don't use that irqdomain pointer inside the gpio_chip.
>
> Instead declare the irqdomain pointer inside struct stm32_gpio_bank
> or something like that.
>
> Yours,
> Linus Walleij
>