linux-kernel - Re: [PATCH v2 6/9] pinctrl: Add IRQ support to STM32 gpios

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Message-ID: <CACRpkdYLPWNQZgdFHVwLOZv+rS=bdERM9St5b0hVHTd_+ZJMKg@mail.gmail.com>
Date:	Fri, 8 Apr 2016 11:43:12 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:	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 v2 6/9] pinctrl: Add IRQ support to STM32 gpios

On Thu, Mar 31, 2016 at 5:09 PM, Maxime Coquelin
<mcoquelin.stm32@...il.com> wrote:

> +static int stm32_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +{
> +       struct stm32_pinctrl *pctl = dev_get_drvdata(chip->parent);
> +       struct stm32_gpio_bank *bank = gpiochip_get_data(chip);
> +       unsigned int irq;
> +
> +       regmap_field_write(pctl->irqmux[offset], bank->range.id);

No. You must implement the irqchip and GPIO controllers to
be orthogonal, doing things like this creates a semantic that
assumes .to_irq() is always called before using the IRQ and
that is not guaranteed at all. A consumer may very well
use an interrupt right off the irqchip without this being called
first. All this function should do is translate a number. No
other semantics.

This needs to be done from the irqchip (sorry).

Yours,
Linus Walleij