linux-kernel - Re: [PATCH v3 3/9] gpio: 104-dio-48e: Migrate to the regmap-irq API

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Date:   Sun, 27 Nov 2022 19:31:48 +0100
From:   Michael Walle <michael@...le.cc>
To:     William Breathitt Gray <william.gray@...aro.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linus.walleij@...aro.org, brgl@...ev.pl,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        broonie@...nel.org
Subject: Re: [PATCH v3 3/9] gpio: 104-dio-48e: Migrate to the regmap-irq API

Hi,

[sorry this mail was just delivered now, although it seems
to be sent last Tuesday.]

Am 2022-11-22 11:29, schrieb William Breathitt Gray:
> On Wed, Nov 23, 2022 at 05:01:53PM +0200, Andy Shevchenko wrote:
>> On Tue, Nov 22, 2022 at 02:11:00AM -0500, William Breathitt Gray 
>> wrote:
>> > +	/* Initialize device interrupt state */
>> > +	err = regmap_read(map, DIO48E_DISABLE_INTERRUPT, &val);
>> > +	if (err)
>> > +		return err;
>> 
>> Use ->init_hw() callback for this.
> 
> In a subsequent patch 7/9 we remove direct gpio_chip registration in
> favor of the i8255 library registration via gpio_regmap. It doesn't 
> look
> like gpio_regmap_register() sets the init_hw() callback.
> 
> Michael, do you see any issues if I introduce init_hw() to
> gpio_regmap_config? Or do you think this IRQ initialization belongs
> somewhere else?

Something like the following?
   gpiochip->init_hw = config.irq_init_hw;

gpiochip doesn't seem to be the correct place, gpiochip_add_irqchip()
is a noop for gpio-regmap, right? So using gpiochip_irqchip_init_hw()
seems wrong.

Maybe make gpio-regmap call it on its own? But really we just connect
the regmap-irq to the gpiochip irqdomain. What is the purpose of the
.init_hw callback? I've looked at other drivers which use regmap-irq
and they all seem to just initialize the hardware in their _probe().

-michael