linux-kernel - Re: [PATCH v5 0/4] add device drivers for Siemens Industrial PCs

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Date:   Mon, 3 Jan 2022 13:53:36 +0100
From:   Henning Schild <henning.schild@...mens.com>
To:     Hans de Goede <hdegoede@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-leds@...r.kernel.org>,
        <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>,
        Pavel Machek <pavel@....cz>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Enrico Weigelt <lkml@...ux.net>
Subject: Re: [PATCH v5 0/4] add device drivers for Siemens Industrial PCs

Am Thu, 23 Dec 2021 18:17:03 +0100
schrieb Hans de Goede <hdegoede@...hat.com>:

> Hi,
> 
> On 12/13/21 13:04, Henning Schild wrote:
> > changes since v4:
> > - make everything around GPIO memory usage more verbose
> >   - commit messages, FIXME in p1, cover-letter
> > 
> > changes since v3:
> > 
> > - fix io access width and region reservations
> > - fix style in p1
> > 
> > changes since v2:
> > 
> > - remove "simatic-ipc" prefix from LED names
> > - fix style issues found in v2, mainly LED driver
> > - fix OEM specific dmi code, and remove magic numbers
> > - more "simatic_ipc" name prefixing
> > - improved pmc quirk code using callbacks
> > 
> > changes since v1:
> > 
> > - fixed lots of style issues found in v1
> >   - (debug) printing
> >   - header ordering
> > - fixed license issues GPLv2 and SPDX in all files
> > - module_platform_driver instead of __init __exit
> > - wdt simplifications cleanup
> > - lots of fixes in wdt driver, all that was found in v1
> > - fixed dmi length in dmi helper
> > - changed LED names to allowed ones
> > - move led driver to simple/
> > - switched pmc_atom to dmi callback with global variable
> > 
> > 
> > This series adds support for watchdogs and leds of several x86
> > devices from Siemens.
> > 
> > It is structured with a platform driver that mainly does
> > identification of the machines. It might trigger loading of the
> > actual device drivers by attaching devices to the platform bus.
> > 
> > The identification is vendor specific, parsing a special binary DMI
> > entry. The implementation of that platform identification is
> > applied on pmc_atom clock quirks in the final patch.
> > 
> > It is all structured in a way that we can easily add more devices
> > and more platform drivers later. Internally we have some more code
> > for hardware monitoring, more leds, watchdogs etc. This will follow
> > some day.
> > 
> > The LED as well as the watchdog drivers access GPIO memory directly.
> > Using pinctrl is not possible because the machines lack ACPI
> > entries for the pinctrl drivers. Updates to the ACPI tables are not
> > expected. So we can rule out a conflict where two drivers would try
> > and access that GPIO memory.
> > So we do not use those pins as "general purpose" but as "Siemens
> > purpose", after having identified the devices very clearly. 
> > 
> > Henning Schild (4):
> >   platform/x86: simatic-ipc: add main driver for Siemens devices
> >   leds: simatic-ipc-leds: add new driver for Siemens Industial PCs
> >   watchdog: simatic-ipc-wdt: add new driver for Siemens Industrial
> > PCs platform/x86: pmc_atom: improve critclk_systems matching for
> > Siemens PCs  
> 
> 
> Thank you for your patch-series, I've applied the series to my
> review-hans branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans
> 
> Note it will show up in my review-hans branch once I've pushed my
> local branch there, which might take a while.
> 
> Once I've run some tests on this branch the patches there will be
> added to the platform-drivers-x86/for-next branch and eventually
> will be included in the pdx86 pull-request to Linus for the next
> merge-window.

Cool! Thanks all for the reviews and for allowing the drivers in. Stay
tuned for more.

regards,
Henning

> Regards,
> 
> Hans
> 
> 
> > 
> >  drivers/leds/Kconfig                          |   3 +
> >  drivers/leds/Makefile                         |   3 +
> >  drivers/leds/simple/Kconfig                   |  11 +
> >  drivers/leds/simple/Makefile                  |   2 +
> >  drivers/leds/simple/simatic-ipc-leds.c        | 202
> > ++++++++++++++++ drivers/platform/x86/Kconfig                  |
> > 12 + drivers/platform/x86/Makefile                 |   3 +
> >  drivers/platform/x86/pmc_atom.c               |  54 +++--
> >  drivers/platform/x86/simatic-ipc.c            | 176 ++++++++++++++
> >  drivers/watchdog/Kconfig                      |  11 +
> >  drivers/watchdog/Makefile                     |   1 +
> >  drivers/watchdog/simatic-ipc-wdt.c            | 228
> > ++++++++++++++++++ .../platform_data/x86/simatic-ipc-base.h      |
> > 29 +++ include/linux/platform_data/x86/simatic-ipc.h |  72 ++++++
> >  14 files changed, 786 insertions(+), 21 deletions(-)
> >  create mode 100644 drivers/leds/simple/Kconfig
> >  create mode 100644 drivers/leds/simple/Makefile
> >  create mode 100644 drivers/leds/simple/simatic-ipc-leds.c
> >  create mode 100644 drivers/platform/x86/simatic-ipc.c
> >  create mode 100644 drivers/watchdog/simatic-ipc-wdt.c
> >  create mode 100644
> > include/linux/platform_data/x86/simatic-ipc-base.h create mode
> > 100644 include/linux/platform_data/x86/simatic-ipc.h 
>