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Date:   Mon, 5 Sep 2022 12:39:59 -0700
From:   Dmitry Torokhov <dmitry.torokhov@gmail.com>
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
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Subject: Re: [PATCH v1 04/11] usb: phy: tegra: switch to using
 devm_gpiod_get()
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References: <20220903-gpiod_get_from_of_node-remove-v1-0-b29adfb27a6c@gmail.com>
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On Mon, Sep 05, 2022 at 01:59:44PM +0300, Andy Shevchenko wrote:
> On Mon, Sep 5, 2022 at 9:32 AM Dmitry Torokhov
> <dmitry.torokhov@gmail.com> 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(), used devm_gpiod_get_from_of_node() is because it
> > wanted to set up a pretty consumer name for the GPIO, and we now have
> > a special API for that.
> 
> ...
> 
> > -               gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
> > -                                                   "nvidia,phy-reset-gpio",
> > -                                                   0, GPIOD_OUT_HIGH,
> > -                                                   "ulpi_phy_reset_b");
> > +               gpiod = devm_gpiod_get(&pdev->dev, "nvidia,phy-reset",
> > +                                      GPIOD_OUT_HIGH);
> >                 err = PTR_ERR_OR_ZERO(gpiod);
> 
> What does _OR_ZERO mean now?

This converts a pointer to an error code if a pointer represents
ERR_PTR() encoded error, or 0 to indicate success.

static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr)
{
	if (IS_ERR(ptr))
		return PTR_ERR(ptr);
	else
		return 0;
}

Thanks.

-- 
Dmitry