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

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Message-ID: <20210323184501.39c81a97@md1za8fc.ad001.siemens.net>
Date:   Tue, 23 Mar 2021 18:45:01 +0100
From:   Henning Schild <henning.schild@...mens.com>
To:     Alexander Dahl <ada@...rsis.com>
Cc:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        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

Am Thu, 18 Mar 2021 13:40:58 +0100
schrieb Alexander Dahl <ada@...rsis.com>:

> 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.

Sorry guys, i am lost here. Is there a driver i can base mine on, if so
which one? Maybe you can point me to a good example that is
conceptually similar.

As i already wrote in the reviews of v1, the ACPI tables will not
change on the machines in question. So there is a need for a driver.
Either one like i did propose or maybe something that patches ACPI or
loads device-tree snippets, again please point me to good examples.

We are talking about x86-only here.

Henning 

> Greets
> Alex