linux-kernel - Re: [PATCH v2 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

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Date:   Thu, 18 Mar 2021 13:40:58 +0100 (CET)
From:   Alexander Dahl <ada@...rsis.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Henning Schild <henning.schild@...mens.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-watchdog@...r.kernel.org,
        Srikanth Krishnakar <skrishnakar@...il.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH v2 2/4] leds: simatic-ipc-leds: add new driver for
 Siemens Industial PCs

Hei hei,

> Enrico Weigelt, metux IT consult <lkml@...ux.net> hat am 18.03.2021 11:27 geschrieben:
> 
>  
> On 15.03.21 11:48, Andy Shevchenko wrote:
> 
> Hi,
> 
> > I have a question, why we can't provide a GPIO driver which is already
> > in the kernel and, with use of the patch series I sent, to convert
> > this all magic to GPIO LEDs as it's done for all normal cases?
> 
> Do we alread have a generic led driver that for cases that just
> set/clear bits in some mem/io location ? If not, that would be really
> great to have.

Yes, there is. Look out for compatible "register-bit-led" in device tree. That's from driver in drivers/leds/leds-syscon.c and you can use it inside a syscon node in dts.

It assumes one bit per LED.

Greets
Alex