linux-kernel - Re: [PATCH RFC 5/6] ARM: pxa: Convert Spitz hsync to GPIO descriptors

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Date:   Mon, 25 Sep 2023 10:36:40 +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 5/6] ARM: pxa: Convert Spitz hsync to GPIO descriptors

On Sun, Sep 24, 2023 at 06:42:58PM +0200, Duje Mihanović wrote:
> Sharp's Spitz still uses the legacy GPIO interface in its wait_for_hsync

We refer to the functions as wait_for_hsync().

> function.
> 
> Convert it to use the GPIO descriptor interface.

...

> +	hsync = gpiod_get(NULL, "hsync", GPIOD_IN);
> +	if (IS_ERR(hsync))
> +		pr_err("Failed to get hsync GPIO: %ld\n", PTR_ERR(hsync));

So, I didn't get, is this GPIO crucial for functioning or optional?
If the former, we need to stop here or bail out (if possible), do we?
Or should use _optional() API?

-- 
With Best Regards,
Andy Shevchenko