linux-kernel - Re: [PATCH v9 06/11] gpio: regmap: Allow to allocate regmap-irq device

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Message-Id: <DA62SSMI7C52.V2QD509S95QW@bootlin.com>
Date: Mon, 26 May 2025 14:03:12 +0200
From: "Mathieu Dubois-Briand" <mathieu.dubois-briand@...tlin.com>
To: "Bartosz Golaszewski" <brgl@...ev.pl>
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>, "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>,
 <andriy.shevchenko@...el.com>, Grégory Clement
 <gregory.clement@...tlin.com>, "Thomas Petazzoni"
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v9 06/11] gpio: regmap: Allow to allocate regmap-irq
 device

On Thu May 22, 2025 at 3:01 PM CEST, Bartosz Golaszewski wrote:
> On Thu, May 22, 2025 at 2:06 PM Mathieu Dubois-Briand
> <mathieu.dubois-briand@...tlin.com> wrote:
>>
>> GPIO controller often have support for IRQ: allow to easily allocate
>> both gpio-regmap and regmap-irq in one operation.
>>
>> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
>> ---
>>  drivers/gpio/gpio-regmap.c  | 21 +++++++++++++++++++--
>>  include/linux/gpio/regmap.h | 11 +++++++++++
>>  2 files changed, 30 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
>> index 87c4225784cf..9cbbbaf82609 100644
>> --- a/drivers/gpio/gpio-regmap.c
>> +++ b/drivers/gpio/gpio-regmap.c
>> @@ -215,6 +215,7 @@ EXPORT_SYMBOL_GPL(gpio_regmap_get_drvdata);
>>   */
>>  struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config)
>>  {
>> +       struct irq_domain *irq_domain;
>>         struct gpio_regmap *gpio;
>>         struct gpio_chip *chip;
>>         int ret;
>> @@ -295,8 +296,24 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
>>         if (ret < 0)
>>                 goto err_free_gpio;
>>
>> -       if (config->irq_domain) {
>> -               ret = gpiochip_irqchip_add_domain(chip, config->irq_domain);
>> +#ifdef CONFIG_REGMAP_IRQ
>> +       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_line,
>> +                                                     config->regmap_irq_flags, 0,
>> +                                                     config->regmap_irq_chip, &irq_chip_data);
>
> I don't think using devres here is a good idea. There's no guarantee
> that gpio_regmap_register() will be called on device attach so you
> must not make the release of the resource depend on an associated
> detach which may never happen. Please use the non-managed variant
> here.

Right, I will make sure to use
regmap_add_irq_chip_fwnode()/regmap_del_irq_chip() here.

I should be able to send a new version in the coming days.

>
> Bart
>

Thanks for your review.
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com