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From: Sander Vanheule <sander@svanheule.net>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
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>,
	Michael Walle <michael@walle.cc>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Linux LED Subsystem <linux-leds@vger.kernel.org>,
	devicetree <devicetree@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Andrew Lunn <andrew@lunn.ch>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 6/7] pinctrl: Add RTL8231 pin control and GPIO support
Date: Sun, 23 May 2021 23:42:34 +0200	[thread overview]
Message-ID: <19144bf02d8678af521986e0e768193fb9084e6d.camel@svanheule.net> (raw)
In-Reply-To: <CAHp75Vf0Qo-hBUAOwhxGiH6azFg0OPV8OkUSfTxWet__MBF9yA@mail.gmail.com>

Hi Andy,

On Tue, 2021-05-18 at 00:42 +0300, Andy Shevchenko wrote:
> On Mon, May 17, 2021 at 10:28 PM Sander Vanheule <sander@svanheule.net> wrote:
> > 
> > This driver implements the GPIO and pin muxing features provided by the
> > RTL8231. The device should be instantiated as an MFD child, where the
> > parent device has already configured the regmap used for register
> > access.
> > 
> > Although described in the bindings, pin debouncing and drive strength
> > selection are currently not implemented. Debouncing is only available
> > for the six highest GPIOs, and must be emulated when other pins are used
> > for (button) inputs anyway.
> 
> ...
> 
> > +struct rtl8231_pin_desc {
> > +       unsigned int number;
> > +       const char *name;
> > +       enum rtl8231_pin_function functions;
> > +       u8 reg;
> > +       u8 offset;
> > +       u8 gpio_function_value;
> > +};
> 
> I would see rather
> 
> sturct pinctrl_pin_desc desc;
> 
> Where drv_data describes the rest of the data for pin
> 

I've split up the definitions into two parts:
 * pinctrl_pin_desc with the standard info, which has drv_data pointing to...
 * a device-specific rtl8231_pin_desc, with the register field info and
   alternate function

So the pin descriptions are now entirely static, and only the pin functions are
assembled at runtime.

> 
> > +static int rtl8231_get_group_pins(struct pinctrl_dev *pctldev, unsigned int
> > selector,
> > +       const unsigned int **pins, unsigned int *num_pins)
> > +{
> 
> > +       if (selector < ARRAY_SIZE(rtl8231_pins)) {
> 
> Can we use traditional pattern, i.e.
> 
>   if (... >= ARRAY_SIZE(...))
>     return -EINVAL;
> 
>   ...
>   return 0;
> 
> ?

Sure. Will be implemented in v3.

> 
> > +               *pins = &rtl8231_pins[selector].number;
> > +               *num_pins = 1;
> > +               return 0;
> > +       }
> > +
> > +       return -EINVAL;
> > +}
> 
> ...
> 
> > +static int rtl8231_set_mux(struct pinctrl_dev *pctldev, unsigned int
> > func_selector,
> > +       unsigned int group_selector)
> > +{
> 
> > +       int err = 0;
> 
> Redundant variable.
> 
> > +       switch (func_flag) {
> > +       case RTL8231_PIN_FUNCTION_LED:
> > +       case RTL8231_PIN_FUNCTION_PWM:
> > +               err = regmap_update_bits(ctrl->map, desc->reg,
> > function_mask, ~gpio_function);
> > +               break;
> > +       case RTL8231_PIN_FUNCTION_GPIO:
> > +               err = regmap_update_bits(ctrl->map, desc->reg,
> > function_mask, gpio_function);
> > +               break;
> > +       default:
> > +               return -EINVAL;
> > +       }
> > +
> > +       return err;
> > +}
> 

I've reworked this whole section a bit. since a pin is either (only) GPIO, or
some alternative function, this could be done with a simpler if/else.

> 
> > +static const struct pinmux_ops rtl8231_pinmux_ops = {
> > +       .set_mux = rtl8231_set_mux,
> > +       .get_functions_count = rtl8231_get_functions_count,
> > +       .get_function_name = rtl8231_get_function_name,
> > +       .get_function_groups = rtl8231_get_function_groups,
> > +       .gpio_request_enable = rtl8231_gpio_request_enable,
> 
> > +       .strict = true
> 
> Leave comma for non-terminator entries.
> 
> > +};
> > +
> > +
> 
> One blank line is enough.
> 
> ...
> 
> > +static int rtl8231_pinctrl_init_functions(struct device *dev, struct
> > rtl8231_pin_ctrl *ctrl)
> > +{
> > +       struct rtl8231_function *function;
> > +       const char **group_name;
> > +       unsigned int f_idx;
> > +       unsigned int pin;
> > +
> > +       ctrl->nfunctions = ARRAY_SIZE(rtl8231_pin_function_names);
> > +       ctrl->functions = devm_kcalloc(dev, ctrl->nfunctions, sizeof(*ctrl-
> > >functions), GFP_KERNEL);
> > +       if (IS_ERR(ctrl->functions)) {
> 
> Wrong.

I was somehow thinking that this would either return an error value or a valid
point. Don't know where I got that, but should be fixed here and for the other
kallocs.

Best,
Sander



  parent reply	other threads:[~2021-05-23 21:42 UTC|newest]

Thread overview: 114+ 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
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 [this message]
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
2021-06-04 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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