linux-kernel - Re: [PATCH v4 6/8] gpiolib: acpi: Add acpi_gpio_get_io

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Message-ID: <YKeiD8LawbyhnDZn@smile.fi.intel.com>
Date:   Fri, 21 May 2021 15:05:35 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Wolfram Sang <wsa@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-i2c@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        devel@...ica.org, Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Gross <mgross@...ux.intel.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: Re: [PATCH v4 6/8] gpiolib: acpi: Add acpi_gpio_get_io_resource()

On Thu, May 20, 2021 at 03:09:26PM +0100, Daniel Scally wrote:
> Add a function to verify that a given acpi_resource represents an IO
> type GPIO resource, and return it if so.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Daniel Scally <djrscally@...il.com>
> ---
> Changes since v3:
> 	- Patch introduced
> 
>  drivers/gpio/gpiolib-acpi.c | 23 +++++++++++++++++++++++
>  include/linux/acpi.h        |  7 +++++++
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> index 684ddb35d83b..9887bb684575 100644
> --- a/drivers/gpio/gpiolib-acpi.c
> +++ b/drivers/gpio/gpiolib-acpi.c
> @@ -196,6 +196,29 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
>  }
>  EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
>  
> +/**
> + * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
> + *			       I/O resource or return False if not.
> + * @ares:	Pointer to the ACPI resource to fetch
> + * @agpio:	Pointer to a &struct acpi_resource_gpio to store the output pointer
> + */
> +bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
> +			       struct acpi_resource_gpio **agpio)
> +{
> +	struct acpi_resource_gpio *gpio;
> +
> +	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
> +		return false;
> +
> +	gpio = &ares->data.gpio;
> +	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
> +		return false;
> +
> +	*agpio = gpio;
> +	return true;
> +}
> +EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
> +
>  static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
>  				      struct acpi_gpio_event *event)
>  {
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 170b9bebdb2b..e8ba7063c000 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -1098,6 +1098,8 @@ void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const c
>  #if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)
>  bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
>  				struct acpi_resource_gpio **agpio);
> +bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
> +			       struct acpi_resource_gpio **agpio);
>  int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
>  #else
>  static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
> @@ -1105,6 +1107,11 @@ static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
>  {
>  	return false;
>  }
> +static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
> +					     struct acpi_resource_gpio **agpio)
> +{
> +	return false;
> +}
>  static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
>  					   const char *name, int index)
>  {
> -- 
> 2.25.1
> 

-- 
With Best Regards,
Andy Shevchenko