linux-kernel - Re: [PATCH v4 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs

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Date:   Fri, 26 Nov 2021 18:48:31 +0100
From:   Henning Schild <henning.schild@...mens.com>
To:     Andy Shevchenko <andy.shevchenko@...il.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>, Enrico Weigelt <lkml@...ux.net>
Subject: Re: [PATCH v4 2/4] leds: simatic-ipc-leds: add new driver for
 Siemens Industial PCs

Am Fri, 26 Nov 2021 17:02:00 +0200
schrieb Andy Shevchenko <andy.shevchenko@...il.com>:

> On Fri, Nov 26, 2021 at 4:10 PM Henning Schild
> <henning.schild@...mens.com> wrote:
> >
> > This driver adds initial support for several devices from Siemens.
> > It is based on a platform driver introduced in an earlier commit.  
> 
> ...
> 
> > +static struct simatic_ipc_led simatic_ipc_leds_mem[] = {
> > +       {0x500 + 0x1A0, "red:" LED_FUNCTION_STATUS "-1"},
> > +       {0x500 + 0x1A8, "green:" LED_FUNCTION_STATUS "-1"},
> > +       {0x500 + 0x1C8, "red:" LED_FUNCTION_STATUS "-2"},
> > +       {0x500 + 0x1D0, "green:" LED_FUNCTION_STATUS "-2"},
> > +       {0x500 + 0x1E0, "red:" LED_FUNCTION_STATUS "-3"},
> > +       {0x500 + 0x198, "green:" LED_FUNCTION_STATUS "-3"},
> > +       { }
> > +};  
> 
> Like I said, this is not okay.
> 
> Why can't you simply enable the pinctrl driver and use it?

What do you mean with enable (=m, =y)? The kernel has it built in ...
but it does not come up because it does not find an ACPI table entry
nor a p2sb PCI device.

When with enable you mean ... repair the pinctrl drivers with your
patches, i am afraid i am not qualified and hardly responsible. It is
not "simple" for me. I will test and switch to pinctrl .... but here i
am tired of waiting and pushing/asking to turn the order of patches
around.

Or can i trigger the pinctrl driver to probe from my init/probe?

Henning