linux-kernel - Re: [PATCH RFC v2 1/6] ARM: pxa: Convert Spitz OHCI to GPIO descriptors

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Date:   Tue, 26 Sep 2023 19:09:01 +0300
From:   Andy Shevchenko <andy@...nel.org>
To:     Duje Mihanović <duje.mihanovic@...le.hr>
Cc:     Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH RFC v2 1/6] ARM: pxa: Convert Spitz OHCI to GPIO
 descriptors

On Tue, Sep 26, 2023 at 05:46:22PM +0200, Duje Mihanović wrote:
> Sharp's Spitz board still uses the legacy GPIO interface for controlling
> a GPIO pin related to the USB host controller.
> 
> Convert this function to use the new GPIO descriptor interface.

...

> +	pxa_ohci->usb_host = gpiod_get_optional(&pdev->dev, "usb-host", GPIOD_OUT_LOW);
> +	if (IS_ERR(pxa_ohci->usb_host))
> +		dev_warn(&pdev->dev, "failed to get USB host GPIO with %pe\n",
> +				pxa_ohci->usb_host);

No, with _optional() you should terminate the execution and bail out. The idea
behind *optional* is that we skip errors only for the cases when GPIO is not
provided. Otherwise we need to handle the errors (yes, the dev_err() has to
be used).

-- 
With Best Regards,
Andy Shevchenko