linux-kernel - Re: [PATCH v3 1/7] gpiolib: Add GPIOCHIP

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Date:   Thu, 28 Nov 2019 04:38:39 +0100 (CET)
From:   Ulrich Hecht <uli@...nd.eu>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     Alexander Graf <graf@...zon.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Reid <preid@...ctromag.com.au>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org
Subject: Re: [PATCH v3 1/7] gpiolib: Add GPIOCHIP_NAME definition


> On November 27, 2019 at 9:42 AM Geert Uytterhoeven <geert+renesas@...der.be> wrote:
> 
> 
> The string literal "gpiochip" is used in several places.
> Add a definition for it, and use it everywhere, to make sure everything
> stays in sync.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v3:
>   - New.
> ---
>  drivers/gpio/gpiolib-sysfs.c | 7 +++----
>  drivers/gpio/gpiolib.c       | 4 ++--
>  drivers/gpio/gpiolib.h       | 2 ++
>  3 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
> index fbf6b1a0a4fae6ce..23e3d335cd543d53 100644
> --- a/drivers/gpio/gpiolib-sysfs.c
> +++ b/drivers/gpio/gpiolib-sysfs.c
> @@ -762,10 +762,9 @@ int gpiochip_sysfs_register(struct gpio_device *gdev)
>  		parent = &gdev->dev;
>  
>  	/* use chip->base for the ID; it's already known to be unique */
> -	dev = device_create_with_groups(&gpio_class, parent,
> -					MKDEV(0, 0),
> -					chip, gpiochip_groups,
> -					"gpiochip%d", chip->base);
> +	dev = device_create_with_groups(&gpio_class, parent, MKDEV(0, 0), chip,
> +					gpiochip_groups, GPIOCHIP_NAME "%d",
> +					chip->base);
>  	if (IS_ERR(dev))
>  		return PTR_ERR(dev);
>  
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index dce0b31f4125a6b3..c9e47620d2434983 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1419,7 +1419,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
>  		ret = gdev->id;
>  		goto err_free_gdev;
>  	}
> -	dev_set_name(&gdev->dev, "gpiochip%d", gdev->id);
> +	dev_set_name(&gdev->dev, GPIOCHIP_NAME "%d", gdev->id);
>  	device_initialize(&gdev->dev);
>  	dev_set_drvdata(&gdev->dev, gdev);
>  	if (chip->parent && chip->parent->driver)
> @@ -5105,7 +5105,7 @@ static int __init gpiolib_dev_init(void)
>  		return ret;
>  	}
>  
> -	ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip");
> +	ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, GPIOCHIP_NAME);
>  	if (ret < 0) {
>  		pr_err("gpiolib: failed to allocate char dev region\n");
>  		bus_unregister(&gpio_bus_type);
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index ca9bc1e4803c2979..a4a759920faa48ab 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -16,6 +16,8 @@
>  #include <linux/module.h>
>  #include <linux/cdev.h>
>  
> +#define GPIOCHIP_NAME	"gpiochip"
> +
>  /**
>   * struct gpio_device - internal state container for GPIO devices
>   * @id: numerical ID number for the GPIO chip
> -- 
> 2.17.1
>

Reviewed-by: Ulrich Hecht <uli+renesas@...nd.eu>

CU
Uli