From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Henning Schild <henning.schild@siemens.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux LED Subsystem <linux-leds@vger.kernel.org>,
Platform Driver <platform-driver-x86@vger.kernel.org>,
linux-watchdog@vger.kernel.org,
Srikanth Krishnakar <skrishnakar@gmail.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
Gerd Haeussler <gerd.haeussler.ext@siemens.com>,
Guenter Roeck <linux@roeck-us.net>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Mark Gross <mgross@linux.intel.com>,
Hans de Goede <hdegoede@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Enrico Weigelt <lkml@metux.net>
Subject: Re: [PATCH v3 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs
Date: Fri, 26 Nov 2021 16:02:48 +0200 [thread overview]
Message-ID: <CAHp75VeX89T7t=Q7-q56sndbfRyuPDEUjSMsMFo4sS8cb9AAmw@mail.gmail.com> (raw)
In-Reply-To: <20211126142827.78d2348d@md1za8fc.ad001.siemens.net>
On Fri, Nov 26, 2021 at 3:28 PM Henning Schild
<henning.schild@siemens.com> wrote:
> Am Tue, 30 Mar 2021 14:04:35 +0300
> schrieb Andy Shevchenko <andy.shevchenko@gmail.com>:
> > On Mon, Mar 29, 2021 at 8:59 PM Henning Schild
> > <henning.schild@siemens.com> wrote:
...
> > > +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"},
> > > + { }
> > > +};
> >
> > It seems to me like poking GPIO controller registers directly. This
> > is not good. The question still remains: Can we simply register a
> > GPIO (pin control) driver and use an LED GPIO driver with an
> > additional board file that instantiates it?
>
> The short answer for v4 will be "No we can not!". The pinctrl drivers
> do not currently probe on any of the devices and attempts to fix that
> have failed or gut stuck. I tried to help out where i could and waited
> for a long time.
I see, unfortunately I have stuck with some other (more important
tasks) and can't fulfil this, but I still consider it's no go for
driver poking pin control registers directly. Lemme see if I can
prioritize this for next week.
> Now my take is to turn the order around. We go in like that and will
> happily switch to pinctrl if that ever comes up on the machines.
> Meaning P2SB series on top of this, no more delays please.
I don't want to slip bad code into the kernel where we can avoid that.
> We do use request_region so have a mutex in place. Meaning we really
> only touch GPIO while pinctrl does not!
I haven't got this. On Intel SoCs GPIO is a part of pin control
registers. You can't touch GPIO without touching pin control.
> I see no issue here, waited for a long time and now expect to be
> allowed to get merged first.
Okay, I have these questions / asks so far:
1) Can firmware be fixed in order to provide an ACPI table for the pin
control devices?
2) Can you share firmware (BIOS ROM file I suppose) that I may flash
on an Apollo Lake machine and see if I can reproduce the issue?
3) As may be a last resort, can you share (remotely) or even send to
us the device in question to try?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-11-26 14:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 17:49 [PATCH v3 0/4] add device drivers for Siemens Industrial PCs Henning Schild
2021-03-29 17:49 ` [PATCH v3 1/4] platform/x86: simatic-ipc: add main driver for Siemens devices Henning Schild
2021-11-26 12:39 ` Henning Schild
2021-03-29 17:49 ` [PATCH v3 2/4] leds: simatic-ipc-leds: add new driver for Siemens Industial PCs Henning Schild
2021-03-30 11:04 ` Andy Shevchenko
2021-03-30 11:58 ` Henning Schild
2021-03-30 12:15 ` Andy Shevchenko
2021-03-30 12:30 ` Henning Schild
2021-03-30 12:41 ` Andy Shevchenko
2021-03-30 15:23 ` Henning Schild
2021-03-31 15:40 ` Andy Shevchenko
2021-04-01 10:44 ` Henning Schild
2021-04-01 11:04 ` Andy Shevchenko
2021-04-12 11:56 ` Henning Schild
2021-05-05 14:58 ` Enrico Weigelt, metux IT consult
2021-04-12 15:15 ` Henning Schild
2021-11-26 13:28 ` Henning Schild
2021-11-26 14:02 ` Andy Shevchenko [this message]
2021-11-26 14:44 ` Henning Schild
2021-11-26 14:59 ` Andy Shevchenko
2021-11-26 19:54 ` Henning Schild
2021-11-25 17:11 ` Henning Schild
2021-03-29 17:49 ` [PATCH v3 3/4] watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial PCs Henning Schild
2021-04-01 16:15 ` Enrico Weigelt, metux IT consult
2021-04-06 14:52 ` Henning Schild
2021-04-07 8:53 ` Andy Shevchenko
2021-04-07 12:17 ` Guenter Roeck
2021-11-26 13:18 ` Henning Schild
2021-04-12 15:35 ` Henning Schild
2021-04-12 16:06 ` Guenter Roeck
2021-04-12 16:17 ` Henning Schild
2021-11-25 17:08 ` Henning Schild
2021-11-25 17:10 ` Henning Schild
2021-03-29 17:49 ` [PATCH v3 4/4] platform/x86: pmc_atom: improve critclk_systems matching for Siemens PCs Henning Schild
2021-03-29 18:00 ` [PATCH v3 0/4] add device drivers for Siemens Industrial PCs Henning Schild
2021-04-07 11:36 ` Hans de Goede
2021-04-12 11:27 ` Henning Schild
2021-07-12 11:35 ` Henning Schild
2021-07-12 12:09 ` Andy Shevchenko
2021-07-12 16:11 ` Henning Schild
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