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

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Date:   Thu, 23 Dec 2021 18:17:03 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Henning Schild <henning.schild@...mens.com>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-watchdog@...r.kernel.org
Cc:     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

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.

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
>