linux-kernel - Re: [PATCH v5 06/11] gpio: regmap: Allow to allocate regmap-irq device

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Message-ID: <Z9mksuMAlNCa447h@smile.fi.intel.com>
Date: Tue, 18 Mar 2025 18:52:02 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Kamel Bouhara <kamel.bouhara@...tlin.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Michael Walle <mwalle@...nel.org>, Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-input@...r.kernel.org, linux-pwm@...r.kernel.org,
	Grégory Clement <gregory.clement@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v5 06/11] gpio: regmap: Allow to allocate regmap-irq
 device

On Tue, Mar 18, 2025 at 05:26:22PM +0100, Mathieu Dubois-Briand wrote:
> GPIO controller often have support for IRQ: allow to easily allocate
> both gpio-regmap and regmap-irq in one operation.

...

> -	if (config->irq_domain) {
> -		ret = gpiochip_irqchip_add_domain(chip, config->irq_domain);

> +	irq_domain = config->irq_domain;

Better to move it into #else, so we avoid double assignment (see below).

> +#ifdef CONFIG_GPIOLIB_IRQCHIP
> +	if (config->regmap_irq_chip) {
> +		struct regmap_irq_chip_data *irq_chip_data;
> +
> +		ret = devm_regmap_add_irq_chip_fwnode(config->parent, dev_fwnode(config->parent),
> +						      config->regmap, config->regmap_irq_irqno,
> +						      config->regmap_irq_flags, 0,
> +						      config->regmap_irq_chip, &irq_chip_data);
> +		if (ret)
> +			goto err_free_gpio;
> +
> +		irq_domain = regmap_irq_get_domain(irq_chip_data);
> +		if (config->regmap_irq_chip_data)
> +			*config->regmap_irq_chip_data = irq_chip_data;

Hmm... I was under impression that we don't need this to be returned.
Do we have any user of it right now? If not, no need to export until
it is needed.

> +	}

	} else

> +#endif

	irq_domain = config->irq_domain;

> +
> +	if (irq_domain) {
> +		ret = gpiochip_irqchip_add_domain(chip, irq_domain);
>  		if (ret)
>  			goto err_remove_gpiochip;
>  	}

...

> +#ifdef CONFIG_GPIOLIB_IRQCHIP
> +	struct regmap_irq_chip *regmap_irq_chip;
> +	struct regmap_irq_chip_data **regmap_irq_chip_data;

But why double pointer?

> +	int regmap_irq_irqno;
> +	unsigned long regmap_irq_flags;
> +#endif

-- 
With Best Regards,
Andy Shevchenko