From: Sander Vanheule <sander@svanheule.net>
To: Michael Walle <michael@walle.cc>
Cc: Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>,
Lee Jones <lee.jones@linaro.org>, Mark Brown <broonie@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
linux-gpio@vger.kernel.org, Andrew Lunn <andrew@lunn.ch>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/7] gpio: regmap: Add configurable dir/value order
Date: Sun, 23 May 2021 23:19:22 +0200 [thread overview]
Message-ID: <2ad8d401c6c76f5233ba0bec43217b311e2a2f76.camel@svanheule.net> (raw)
In-Reply-To: <675e36df5aaa1e1be3a1a77289a0a952@walle.cc>
Hi Michael,
On Tue, 2021-05-18 at 10:39 +0200, Michael Walle wrote:
> Hi,
>
> Am 2021-05-17 21:28, schrieb Sander Vanheule:
> > GPIO chips may not support setting the output value when a pin is
> > configured as an input, although the current implementation assumes
> > this
> > is always possible.
> >
> > Add support for setting pin direction before value. The order defaults
> > to setting the value first, but this can be reversed by setting the
> > regmap_config.no_set_on_input flag, similar to the corresponding flag
> > in
> > the gpio-mmio driver.
> >
> > Signed-off-by: Sander Vanheule <sander@svanheule.net>
> > ---
> > drivers/gpio/gpio-regmap.c | 20 +++++++++++++++++---
> > include/linux/gpio/regmap.h | 3 +++
> > 2 files changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
> > index 134cedf151a7..1cdb20f8f8b4 100644
> > --- a/drivers/gpio/gpio-regmap.c
> > +++ b/drivers/gpio/gpio-regmap.c
> > @@ -170,14 +170,25 @@ static int gpio_regmap_direction_input(struct
> > gpio_chip *chip,
> > return gpio_regmap_set_direction(chip, offset, false);
> > }
> >
> > -static int gpio_regmap_direction_output(struct gpio_chip *chip,
> > - unsigned int offset, int value)
> > +static int gpio_regmap_dir_out_val_first(struct gpio_chip *chip,
> > + unsigned int offset, int value)
>
> Can we leave the name as is? TBH I find these two similar names
> super confusing. Maybe its just me, though.
Sure. This is the implementation used in gpio-mmio.c to provide the same
functionality, so I had used that for consistenty between the two drivers.
> > {
> > gpio_regmap_set(chip, offset, value);
> >
> > return gpio_regmap_set_direction(chip, offset, true);
> > }
> >
> > +static int gpio_regmap_dir_out_dir_first(struct gpio_chip *chip,
> > + unsigned int offset, int value)
> > +{
> > + int err;
>
> use ret for consistency here
>
> > +
> > + err = gpio_regmap_set_direction(chip, offset, true);
> > + gpio_regmap_set(chip, offset, value);
> > +
> > + return err;
> > +}
> > +
>
> Instead of adding a new one, we can also just check no_set_on_input
> in gpio_regmap_direction_output(), which I'd prefer.
>
> static int gpio_regmap_direction_output(struct gpio_chip *chip,
> unsigned int offset, int value)
> {
> struct gpio_regmap *gpio = gpiochip_get_data(chip);
> int ret;
>
> if (gpio->no_set_on_input) {
> /* some smart comment here, also mention gliches */
> ret = gpio_regmap_set_direction(chip, offset, true);
> gpio_regmap_set(chip, offset, value);
> } else {
> gpio_regmap_set(chip, offset, value);
> ret = gpio_regmap_set_direction(chip, offset, true);
> }
>
> return ret;
> }
>
This would certainly make the code a bit easier to follow when you're not
familiar with it :-)
I also see the other functions do checks on static values too, so I'll bring
this function in line with that style.
> > void gpio_regmap_set_drvdata(struct gpio_regmap *gpio, void *data)
> > {
> > gpio->driver_data = data;
> > @@ -277,7 +288,10 @@ struct gpio_regmap *gpio_regmap_register(const
> > struct gpio_regmap_config *config
> > if (gpio->reg_dir_in_base || gpio->reg_dir_out_base) {
> > chip->get_direction = gio_regmap_get_direction;
> > chip->direction_input = gpio_regmap_direction_input;
> > - chip->direction_output = gpio_regmap_direction_output;
> > + if (config->no_set_on_input)
> > + chip->direction_output =
> > gpio_regmap_dir_out_dir_first;
> > + else
> > + chip->direction_output =
> > gpio_regmap_dir_out_val_first;
> > }
> >
> > ret = gpiochip_add_data(chip, gpio);
> > diff --git a/include/linux/gpio/regmap.h b/include/linux/gpio/regmap.h
> > index 334dd928042b..2a732f8f23be 100644
> > --- a/include/linux/gpio/regmap.h
> > +++ b/include/linux/gpio/regmap.h
> > @@ -30,6 +30,8 @@ struct regmap;
> > * @reg_dir_out_base: (Optional) out setting register base address
> > * @reg_stride: (Optional) May be set if the registers (of
> > the
> > * same type, dat, set, etc) are not consecutive.
> > + * @no_set_on_input: Set if output value can only be set when the
> > direction
> > + * is configured as output.
>
> set_direction_first ?
This negation can indeed be a bit confusing, I'll change this. As Andy
suggested, I just went for a 'quirks' field, with currently only one defined
flag.
Best,
Sander
next prev parent reply other threads:[~2021-05-23 21:19 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 12:25 [PATCH 0/5] RTL8231 GPIO expander support Sander Vanheule
2021-05-11 12:25 ` [PATCH 1/5] dt-bindings: leds: Binding for RTL8231 scan matrix Sander Vanheule
2021-05-17 22:31 ` Rob Herring
2021-05-19 16:39 ` Sander Vanheule
2021-05-11 12:25 ` [PATCH 2/5] dt-bindings: mfd: Binding for RTL8231 Sander Vanheule
2021-05-17 22:38 ` Rob Herring
2021-05-19 16:53 ` Sander Vanheule
2021-05-11 12:25 ` [PATCH 3/5] mfd: Add RTL8231 core device Sander Vanheule
2021-05-12 12:29 ` kernel test robot
2021-05-12 13:13 ` kernel test robot
2021-05-19 14:58 ` Lee Jones
2021-05-19 15:11 ` Sander Vanheule
2021-05-11 12:25 ` [PATCH 4/5] pinctrl: Add RTL8231 pin control and GPIO support Sander Vanheule
2021-05-11 12:25 ` [PATCH 5/5] leds: Add support for RTL8231 LED scan matrix Sander Vanheule
[not found] ` <CAHp75VffoKyyPJbdtKMLx575c9LT0S8+EHOk7Mw36j=aTL6Q4Q@mail.gmail.com>
2021-05-16 21:40 ` [PATCH 0/5] RTL8231 GPIO expander support Sander Vanheule
2021-05-17 8:13 ` Andy Shevchenko
2021-05-17 8:50 ` Sander Vanheule
2021-05-17 19:32 ` Sander Vanheule
2021-05-17 19:28 ` [PATCH v2 0/7] " Sander Vanheule
2021-05-17 19:28 ` [PATCH v2 1/7] regmap: Add MDIO bus support Sander Vanheule
2021-05-19 16:12 ` Mark Brown
2021-05-17 19:28 ` [PATCH v2 2/7] gpio: regmap: Add configurable dir/value order Sander Vanheule
2021-05-17 21:06 ` Andy Shevchenko
2021-05-18 1:40 ` Andrew Lunn
2021-05-18 11:39 ` Sander Vanheule
2021-05-23 22:21 ` Sander Vanheule
2021-05-18 8:39 ` Michael Walle
2021-05-18 10:39 ` Andy Shevchenko
2021-05-23 21:19 ` Sander Vanheule [this message]
2021-05-17 19:28 ` [PATCH v2 3/7] dt-bindings: leds: Binding for RTL8231 scan matrix Sander Vanheule
2021-05-17 19:28 ` [PATCH v2 4/7] dt-bindings: mfd: Binding for RTL8231 Sander Vanheule
2021-05-18 22:02 ` Linus Walleij
2021-05-17 19:28 ` [PATCH v2 5/7] mfd: Add RTL8231 core device Sander Vanheule
2021-05-17 21:18 ` Andy Shevchenko
2021-05-23 21:28 ` Sander Vanheule
2021-05-24 7:49 ` Andy Shevchenko
2021-05-24 7:50 ` Sander Vanheule
2021-05-24 7:55 ` Andy Shevchenko
2021-05-24 8:04 ` Sander Vanheule
2021-05-17 19:28 ` [PATCH v2 6/7] pinctrl: Add RTL8231 pin control and GPIO support Sander Vanheule
2021-05-17 21:42 ` Andy Shevchenko
2021-05-17 21:46 ` Andy Shevchenko
2021-05-23 21:42 ` Sander Vanheule
2021-05-17 19:28 ` [PATCH v2 7/7] leds: Add support for RTL8231 LED scan matrix Sander Vanheule
2021-05-17 22:00 ` Andy Shevchenko
2021-05-23 21:53 ` Sander Vanheule
2021-05-19 16:10 ` (subset) [PATCH v2 0/7] RTL8231 GPIO expander support Mark Brown
2021-05-23 22:33 ` [PATCH v3 0/6] " Sander Vanheule
2021-05-23 22:33 ` [PATCH v3 1/6] gpio: regmap: Add quirk for output data register Sander Vanheule
2021-05-28 6:40 ` Michael Walle
2021-06-03 10:03 ` Sander Vanheule
2021-05-31 7:25 ` Bartosz Golaszewski
2021-05-23 22:34 ` [PATCH v3 2/6] dt-bindings: leds: Binding for RTL8231 scan matrix Sander Vanheule
2021-06-02 18:58 ` Rob Herring
2021-05-23 22:34 ` [PATCH v3 3/6] dt-bindings: mfd: Binding for RTL8231 Sander Vanheule
2021-05-27 23:31 ` Linus Walleij
2021-06-02 19:02 ` Rob Herring
2021-05-23 22:34 ` [PATCH v3 4/6] mfd: Add RTL8231 core device Sander Vanheule
2021-05-24 8:02 ` Andy Shevchenko
2021-05-24 8:23 ` Sander Vanheule
2021-05-24 10:18 ` Andy Shevchenko
2021-05-24 11:41 ` Sander Vanheule
2021-05-23 22:34 ` [PATCH v3 5/6] pinctrl: Add RTL8231 pin control and GPIO support Sander Vanheule
2021-05-28 6:29 ` Michael Walle
2021-05-28 6:42 ` Sander Vanheule
2021-05-28 6:43 ` Michael Walle
2021-05-23 22:34 ` [PATCH v3 6/6] leds: Add support for RTL8231 LED scan matrix Sander Vanheule
2021-05-24 10:24 ` Andy Shevchenko
2021-05-24 12:04 ` Sander Vanheule
2021-05-24 12:47 ` Andy Shevchenko
2021-05-24 15:30 ` Sander Vanheule
2021-05-24 1:10 ` [PATCH v3 0/6] RTL8231 GPIO expander support Andrew Lunn
2021-05-24 7:53 ` Andy Shevchenko
2021-05-24 11:41 ` Sander Vanheule
2021-05-24 12:54 ` Andy Shevchenko
2021-05-24 15:03 ` Sander Vanheule
2021-05-24 16:30 ` Andy Shevchenko
2021-05-25 17:11 ` Andy Shevchenko
2021-05-25 18:00 ` Sander Vanheule
2021-05-26 21:02 ` Sander Vanheule
2021-05-27 10:38 ` Andy Shevchenko
2021-05-27 10:41 ` Hans de Goede
2021-05-24 15:20 ` Sander Vanheule
2021-05-28 6:37 ` Michael Walle
2021-05-30 16:19 ` Sander Vanheule
2021-05-30 16:51 ` Hans de Goede
2021-05-30 18:16 ` Andy Shevchenko
2021-05-30 21:22 ` Michael Walle
2021-05-31 8:36 ` Sander Vanheule
2021-05-31 10:02 ` Michael Walle
[not found] ` <CAHp75VfOrUBRQH1vrXEwHN4ZPojQfQju-_wp_3djZeozEaatug@mail.gmail.com>
2021-05-31 15:33 ` [PATCH 0/5] " Sander Vanheule
2021-05-31 15:48 ` Andy Shevchenko
2021-06-01 11:49 ` Michael Walle
2021-06-01 15:24 ` Andy Shevchenko
2021-06-02 20:20 ` Sander Vanheule
2021-06-01 9:59 ` [PATCH v3 0/6] " Linus Walleij
2021-06-01 10:18 ` Michael Walle
2021-06-01 10:51 ` Linus Walleij
2021-06-01 11:41 ` Michael Walle
2021-06-01 11:48 ` Linus Walleij
2021-06-03 10:00 ` [PATCH v4 0/5] " Sander Vanheule
2021-06-03 10:00 ` [PATCH v4 1/5] dt-bindings: leds: Binding for RTL8231 scan matrix Sander Vanheule
2021-06-03 10:00 ` [PATCH v4 2/5] dt-bindings: mfd: Binding for RTL8231 Sander Vanheule
2021-06-03 10:00 ` [PATCH v4 3/5] mfd: Add RTL8231 core device Sander Vanheule
2021-06-03 10:58 ` Andy Shevchenko
2021-06-03 11:28 ` Sander Vanheule
2021-06-03 14:03 ` Andrew Lunn
2021-06-03 15:20 ` Sander Vanheule
2021-06-05 11:07 ` Sander Vanheule
2021-06-03 10:00 ` [PATCH v4 4/5] pinctrl: Add RTL8231 pin control and GPIO support Sander Vanheule
2021-06-03 10:18 ` Andy Shevchenko
2021-06-03 15:58 ` kernel test robot
2021-06-04 7:00 ` Sander Vanheule
2021-06-04 22:10 ` Linus Walleij
2021-06-03 10:00 ` [PATCH v4 5/5] leds: Add support for RTL8231 LED scan matrix Sander Vanheule
2021-06-03 11:01 ` Andy Shevchenko
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