linux-kernel - Re: [RFC PATCH v4 07/10] gpio: Initial support for ROHM bd70528 GPIO block

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Message-ID: <CAMpxmJXKmq29misG_zx9qeaQ11qzYSvWqNwcNpRGc3cv4AK8eg@mail.gmail.com>
Date:   Mon, 4 Feb 2019 13:53:12 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        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>,
        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>,
        Guenter Roeck <linux@...ck-us.net>,
        "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>
Subject: Re: [RFC PATCH v4 07/10] gpio: Initial support for ROHM bd70528 GPIO block

pon., 4 lut 2019 o 12:30 Linus Walleij <linus.walleij@...aro.org> napisał(a):
>
> On Thu, Jan 31, 2019 at 1:08 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>
> (...)
> > I dropped the review-by from Linus Walleij because I would like to
> > get a comment on if locking is required when we check the direction
> > in order to detect the correct register for getting the pin state.
>
> I don't know that. You isn't regmap locking inherently?
>

FYI you can disable regmap locking by setting the disable_locking
field in regmap_config to true.

Bart

> > My initial feeling is that locking makes no sense.
>
> Mine too.
>
> > +       bdgpio->gpio.get_direction = &bd70528_get_direction;
> > +       bdgpio->gpio.direction_input = &bd70528_direction_input;
> > +       bdgpio->gpio.direction_output = &bd70528_direction_output;
> > +       bdgpio->gpio.set_config = &bd70528_gpio_set_config;
> > +       bdgpio->gpio.can_sleep = true;
> > +       bdgpio->gpio.get = &bd70528_gpio_get;
> > +       bdgpio->gpio.set = &bd70528_gpio_set;
>
> Drop the &ampersand in from of the functions. All functions
> are pointers.
>
> With that:
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
>
> Yours,
> Linus Walleij