linux-kernel - Re: [PATCH v2 3/3] pinctrl / gpio: Introduce .set

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Date:   Mon, 23 Jan 2017 18:11:07 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] pinctrl / gpio: Introduce .set_config() callback
 for GPIO chips

On Mon, Jan 23, 2017 at 03:34:34PM +0300, Mika Westerberg wrote:
> Currently we already have two pin configuration related callbacks
> available for GPIO chips .set_single_ended() and .set_debounce(). In
> future we expect to have even more, which does not scale well if we need
> to add yet another callback to the GPIO chip structure for each possible
> configuration parameter.
> 
> Better solution is to reuse what we already have available in the
> generic pinconf.
> 
> To support this, we introduce a new .set_config() callback for GPIO
> chips. The callback takes a single packed pin configuration value as
> parameter. This can then be extended easily beyond what is currently
> supported by just adding new types to the generic pinconf enum.
> 
> If the GPIO driver is backed up by a pinctrl driver the GPIO driver can
> just assign gpiochip_generic_config() (introduced in this patch) to
> .set_config and that will take care configuration requests are directed
> to the pinctrl driver.
> 
> We then convert the existing drivers over .set_config() and finally
> remove the .set_single_ended() and .set_debounce() callbacks.
> 
> Suggested-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  Documentation/gpio/driver.txt                 |  9 +++--
>  drivers/gpio/gpio-bcm-kona.c                  | 14 ++++++-
>  drivers/gpio/gpio-dln2.c                      | 12 ++++--
>  drivers/gpio/gpio-dwapb.c                     | 14 ++++++-
>  drivers/gpio/gpio-ep93xx.c                    | 11 ++++--
>  drivers/gpio/gpio-f7188x.c                    | 19 +++++----
>  drivers/gpio/gpio-lp873x.c                    | 14 +++----
>  drivers/gpio/gpio-max77620.c                  | 20 +++++-----
>  drivers/gpio/gpio-menz127.c                   | 34 +++++++++++-----
>  drivers/gpio/gpio-merrifield.c                | 14 ++++++-
>  drivers/gpio/gpio-omap.c                      | 14 ++++++-
>  drivers/gpio/gpio-tc3589x.c                   | 15 ++++---
>  drivers/gpio/gpio-tegra.c                     | 14 ++++++-
>  drivers/gpio/gpio-tps65218.c                  | 14 +++----
>  drivers/gpio/gpio-vx855.c                     | 13 ++++---
>  drivers/gpio/gpio-wcove.c                     | 13 +++----
>  drivers/gpio/gpio-wm831x.c                    | 21 +++++-----
>  drivers/gpio/gpio-wm8994.c                    | 13 +++----
>  drivers/gpio/gpiolib.c                        | 56 +++++++++++++++++----------
>  drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 14 ++++++-
>  drivers/pinctrl/pinctrl-amd.c                 | 14 ++++++-
>  drivers/pinctrl/pinctrl-sx150x.c              | 55 +++++++-------------------
>  drivers/staging/greybus/gpio.c                | 15 ++++---
>  drivers/usb/serial/cp210x.c                   | 13 ++++---

For greybus and USB serial:

Acked-by: Johan Hovold <johan@...nel.org>

Note however that this patch fails to apply to linux-next (conflicts in
pinctrl as well as staging).

Thanks,
Johan