linux-kernel - Re: [PATCH v4] leds: simatic-ipc-leds-gpio: make sure we have the GPIO providing driver

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Message-ID: <Y8mv8PzL1UsP9gNh@google.com>
Date:   Thu, 19 Jan 2023 21:02:40 +0000
From:   Lee Jones <lee@...nel.org>
To:     Henning Schild <henning.schild@...mens.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v4] leds: simatic-ipc-leds-gpio: make sure we have the
 GPIO providing driver

On Fri, 07 Oct 2022, Henning Schild wrote:

> If we register a "leds-gpio" platform device for GPIO pins that do not
> exist we get a -EPROBE_DEFER and the probe will be tried again later.
> If there is no driver to provide that pin we will poll forever and also
> create a lot of log messages.
> 
> So check if that GPIO driver is configured, if so it will come up
> eventually. If not, we exit our probe function early and do not even
> bother registering the "leds-gpio". This method was chosen over "Kconfig
> depends" since this way we can add support for more devices and GPIO
> backends more easily without "depends":ing on all GPIO backends.
> 
> Fixes: a6c80bec3c93 ("leds: simatic-ipc-leds-gpio: Add GPIO version of Siemens driver")
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Henning Schild <henning.schild@...mens.com>
> ---
>  drivers/leds/simple/simatic-ipc-leds-gpio.c | 2 ++
>  1 file changed, 2 insertions(+)

FYI: I'm going to try my best not to take another one like this.

Please try to improve the whole situation for you next submission.

Applied, thanks.

-- 
Lee Jones [李琼斯]