From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Kent Gibson <warthog618@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [PATCH v2 03/18] gpiolib: make cdev a build option
Date: Sat, 25 Jul 2020 23:29:50 +0300 [thread overview]
Message-ID: <CAHp75Ve4e4JdAQ2YGWqm9JEaKViw861fSUbCfxEP7HnKBDj_fQ@mail.gmail.com> (raw)
In-Reply-To: <20200725041955.9985-4-warthog618@gmail.com>
On Sat, Jul 25, 2020 at 7:21 AM Kent Gibson <warthog618@gmail.com> wrote:
>
> Make the gpiolib-cdev module a build option. This allows the CDEV
> interface to be removed from the kernel to reduce kernel size in
> applications where is it not required, and provides the parent for
> other other CDEV interface specific build options to follow.
>
> Suggested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> Signed-off-by: Kent Gibson <warthog618@gmail.com>
> ---
> drivers/gpio/Kconfig | 16 ++++++++++++++--
> drivers/gpio/Makefile | 2 +-
> drivers/gpio/gpiolib-cdev.h | 15 +++++++++++++++
> 3 files changed, 30 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 8030fd91a3cc..b5bb9efc1092 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -66,8 +66,20 @@ config GPIO_SYSFS
>
> This ABI is deprecated. If you want to use GPIO from userspace,
> use the character device /dev/gpiochipN with the appropriate
> - ioctl() operations instead. The character device is always
> - available.
> + ioctl() operations instead.
> +
> +config GPIO_CDEV
> + bool "/dev/gpiochipN (character device interface)"
> + default y
> + help
> + Say Y here to add the character device /dev/gpiochipN interface
> + for GPIOs. The character device allows userspace to control GPIOs
> + using ioctl() operations.
> +
> + Only say N is you are sure that the GPIO character device is not
is -> if
> + required.
> +
> + If unsure, say Y.
>
> config GPIO_GENERIC
> depends on HAS_IOMEM # Only for IOMEM drivers
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 4f9abff4f2dc..7c24c8d77068 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -7,8 +7,8 @@ obj-$(CONFIG_GPIOLIB) += gpiolib.o
> obj-$(CONFIG_GPIOLIB) += gpiolib-devres.o
> obj-$(CONFIG_GPIOLIB) += gpiolib-legacy.o
> obj-$(CONFIG_GPIOLIB) += gpiolib-devprop.o
> -obj-$(CONFIG_GPIOLIB) += gpiolib-cdev.o
> obj-$(CONFIG_OF_GPIO) += gpiolib-of.o
> +obj-$(CONFIG_GPIO_CDEV) += gpiolib-cdev.o
> obj-$(CONFIG_GPIO_SYSFS) += gpiolib-sysfs.o
> obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o
>
> diff --git a/drivers/gpio/gpiolib-cdev.h b/drivers/gpio/gpiolib-cdev.h
> index 973578e7ad10..19a4e3d57120 100644
> --- a/drivers/gpio/gpiolib-cdev.h
> +++ b/drivers/gpio/gpiolib-cdev.h
> @@ -5,7 +5,22 @@
>
> #include <linux/device.h>
>
> +#ifdef CONFIG_GPIO_CDEV
> +
> int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);
> void gpiolib_cdev_unregister(struct gpio_device *gdev);
>
> +#else
> +
> +static inline int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
> +{
> + return 0;
> +}
> +
> +static inline void gpiolib_cdev_unregister(struct gpio_device *gdev)
> +{
> +}
> +
> +#endif /* CONFIG_GPIO_CDEV */
> +
> #endif /* GPIOLIB_CDEV_H */
> --
> 2.27.0
>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-07-25 20:30 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-25 4:19 [PATCH v2 00/18] gpio: cdev: add uAPI V2 Kent Gibson
2020-07-25 4:19 ` [PATCH v2 01/18] gpio: uapi: define GPIO_MAX_NAME_SIZE for array sizes Kent Gibson
2020-07-25 4:19 ` [PATCH v2 02/18] gpio: uapi: define uAPI v2 Kent Gibson
2020-08-04 17:42 ` Bartosz Golaszewski
2020-08-05 5:18 ` Kent Gibson
2020-08-05 17:47 ` Bartosz Golaszewski
2020-08-06 1:03 ` Kent Gibson
2020-08-06 1:15 ` Kent Gibson
2020-08-06 15:53 ` Bartosz Golaszewski
2020-07-25 4:19 ` [PATCH v2 03/18] gpiolib: make cdev a build option Kent Gibson
2020-07-25 20:29 ` Andy Shevchenko [this message]
2020-07-26 22:25 ` Linus Walleij
2020-07-27 1:46 ` Kent Gibson
2020-07-27 5:57 ` Kent Gibson
2020-07-27 8:15 ` Linus Walleij
2020-07-25 4:19 ` [PATCH v2 04/18] gpiolib: add build option for CDEV v1 ABI Kent Gibson
2020-07-25 4:19 ` [PATCH v2 05/18] gpiolib: cdev: support GPIO_GET_LINE_IOCTL and GPIOLINE_GET_VALUES_IOCTL Kent Gibson
2020-07-25 20:51 ` Andy Shevchenko
2020-07-26 1:12 ` Kent Gibson
2020-07-26 3:24 ` Kent Gibson
2020-07-29 2:28 ` Kent Gibson
2020-07-29 8:05 ` Andy Shevchenko
2020-07-29 10:01 ` Kent Gibson
2020-07-31 16:05 ` Bartosz Golaszewski
2020-08-02 3:31 ` Kent Gibson
2020-08-02 9:32 ` Kent Gibson
2020-08-03 19:59 ` Bartosz Golaszewski
2020-08-03 20:02 ` Bartosz Golaszewski
2020-08-03 23:01 ` Kent Gibson
2020-08-04 17:47 ` Bartosz Golaszewski
2020-08-05 3:06 ` Kent Gibson
2020-07-25 4:19 ` [PATCH v2 06/18] gpiolib: cdev: support GPIO_GET_LINEINFO_V2_IOCTL and GPIO_GET_LINEINFO_WATCH_V2_IOCTL Kent Gibson
2020-07-25 4:19 ` [PATCH v2 07/18] gpiolib: cdev: support edge detection for uAPI v2 Kent Gibson
2020-08-04 19:28 ` Bartosz Golaszewski
2020-07-25 4:19 ` [PATCH v2 08/18] gpiolib: cdev: support GPIOLINE_SET_CONFIG_IOCTL Kent Gibson
2020-07-25 4:19 ` [PATCH v2 09/18] gpiolib: cdev: support GPIOLINE_SET_VALUES_IOCTL Kent Gibson
2020-07-25 4:19 ` [PATCH v2 10/18] gpiolib: cdev: support setting debounce Kent Gibson
2020-07-25 4:19 ` [PATCH v2 11/18] gpio: uapi: document uAPI v1 as deprecated Kent Gibson
2020-08-04 19:43 ` Bartosz Golaszewski
2020-07-25 4:19 ` [PATCH v2 12/18] tools: gpio: port lsgpio to v2 uAPI Kent Gibson
2020-07-25 4:19 ` [PATCH v2 13/18] tools: gpio: port gpio-watch " Kent Gibson
2020-07-25 4:19 ` [PATCH v2 14/18] tools: gpio: rename nlines to num_lines Kent Gibson
2020-07-25 4:19 ` [PATCH v2 15/18] tools: gpio: port gpio-hammer to v2 uAPI Kent Gibson
2020-07-25 4:19 ` [PATCH v2 16/18] tools: gpio: port gpio-event-mon " Kent Gibson
2020-07-25 4:19 ` [PATCH v2 17/18] tools: gpio: add debounce support to gpio-event-mon Kent Gibson
2020-07-25 4:19 ` [PATCH v2 18/18] tools: gpio: add multi-line monitoring " Kent Gibson
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