linux-kernel - Re: [PATCH v9 5/8] gpio: Initial support for ROHM bd70528 GPIO block

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Date:   Thu, 14 Feb 2019 09:00:33 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        heikki.haikola@...rohmeurope.com, mikko.mutanen@...rohmeurope.com,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sebastian Reichel <sre@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-rtc@...r.kernel.org,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        bogdan-petru.chircu-mare@....com
Subject: Re: [PATCH v9 5/8] gpio: Initial support for ROHM bd70528 GPIO block

On Wed, Feb 13, 2019 at 2:34 PM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> ROHM BD70528 PMIC has 4 GPIO pins. Allow them to be
> controlled by GPIO framework.
>
> IRQs are handled by regmap-irq and GPIO driver is not
> aware of the irq usage.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

(...)

Just spotted this:

> +#include <linux/gpio/driver.h>
> +#include <linux/gpio.h>

A driver should only need <linux/gpio/driver.h>
the <linux/gpio.h> should not be used at all in new code,
it is a legacy header.

> +static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
> +                                  unsigned long config)
> +{
> +       struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
> +
> +       switch (pinconf_to_config_param(config)) {
> +       case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> +               return regmap_update_bits(bdgpio->chip.regmap,
> +                                         GPIO_OUT_REG(offset),
> +                                         BD70528_GPIO_DRIVE_MASK,
> +                                         BD70528_GPIO_OPEN_DRAIN);
> +               break;
> +       case PIN_CONFIG_DRIVE_PUSH_PULL:
> +               return regmap_update_bits(bdgpio->chip.regmap,
> +                                         GPIO_OUT_REG(offset),
> +                                         BD70528_GPIO_DRIVE_MASK,
> +                                         BD70528_GPIO_PUSH_PULL);
> +               break;
> +       case PIN_CONFIG_INPUT_DEBOUNCE:
> +               return bd70528_set_debounce(bdgpio, offset,
> +                                           pinconf_to_config_argument(config));
> +               break;
> +       default:
> +               break;
> +       }
> +       return -ENOTSUPP;
> +}

BTW I just merged code from Thomas Petazzoni that make it possible to
also support pull-up and pull-down from GPIO here if you want to enable
it.

Yours,
Linus Walleij