linux-kernel - Re: [RFC PATCH v2 09/16] leds: leds-gpio: Add support for GPIO descriptors

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Date:	Wed, 24 Sep 2014 09:55:48 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Aaron Lu <aaron.lu@...el.com>,
	Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [RFC PATCH v2 09/16] leds: leds-gpio: Add support for GPIO descriptors

On Tue, Sep 16, 2014 at 1:52 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> GPIO descriptors are the preferred way over legacy GPIO numbers
> nowadays. Convert the driver to use GPIO descriptors internally but
> still allow passing legacy GPIO numbers from platform data to support
> existing platforms.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Great!

>  #include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>

You should not need to include <linux/gpio.h> at all after this change.

> @@ -85,9 +91,10 @@ static int gpio_blink_set(struct led_classdev *led_cdev,
>  {
>         struct gpio_led_data *led_dat =
>                 container_of(led_cdev, struct gpio_led_data, cdev);
> +       int gpio = desc_to_gpio(led_dat->gpiod);
>
>         led_dat->blinking = 1;
> -       return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
> +       return led_dat->platform_gpio_blink_set(gpio, GPIO_LED_BLINK,
>                                                 delay_on, delay_off);
>  }

While this is a nice first step, it must be possible to patch all in-kernel
users of this callback to take a gpiod too...

It's actually just:

$ git grep gpio_blink_set
arch/arm/mach-orion5x/dns323-setup.c:   .gpio_blink_set =
orion_gpio_led_blink_set,
arch/arm/mach-orion5x/dns323-setup.c:   .gpio_blink_set =
orion_gpio_led_blink_set,
arch/arm/mach-s3c24xx/mach-h1940.c:     .gpio_blink_set = h1940_led_blink_set,
arch/arm/mach-s3c24xx/mach-rx1950.c:    .gpio_blink_set = rx1950_led_blink_set,

However we can do that as a follow-up patch. (Add to TODO...)

Yours,
Linus Walleij
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