linux-kernel - Re: [PATCH v1 06/11] PCI: aardvark: switch to using devm_gpiod_get

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Date:   Mon, 5 Sep 2022 13:47:41 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pali Rohár <pali@...nel.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Marc Zyngier <maz@...nel.org>,
        Richard Weinberger <richard@....at>,
        David Airlie <airlied@...ux.ie>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 06/11] PCI: aardvark: switch to using devm_gpiod_get_optional()

On Mon, Sep 5, 2022 at 10:02 AM Pali Rohár <pali@...nel.org> wrote:
> On Sunday 04 September 2022 23:30:58 Dmitry Torokhov wrote:
> > I would like to stop exporting OF-specific devm_gpiod_get_from_of_node()
> > so that gpiolib can be cleaned a bit, so let's switch to the generic
> > device property API.
> >
> > I believe that the only reason the driver, instead of the standard
> > devm_gpiod_get_optional(), used devm_gpiod_get_from_of_node() is
> > because it wanted to set up a pretty consumer name for the GPIO,
>
> IIRC consumer name is not used at all.

It's. The user space tools use it as a label. So, GPIO line can have
"name" (this is provider specific) and "label" (which is consumer
specific, i.o.w. how we use this line).

...

> > +             if (ret != -EPROBE_DEFER)
> > +                     dev_err(dev, "Failed to get reset-gpio: %i\n",
> > +                             ret);
> > +             return ret;

I understand that in the input subsystem maintainer's hat you don't
like dev_err_probe(), but it's a good case to have it here.

...

> > +     ret = gpiod_set_consumer_name(pcie->reset_gpio, "pcie1-reset");
> > +     if (ret) {
> > +             dev_err(dev, "Failed to set reset gpio name: %d\n", ret);
> > +             return ret;
> >       }

Ditto.


-- 
With Best Regards,
Andy Shevchenko