linux-kernel - Re: [PATCH v9 19/20] platform/x86: intel_pmc

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Date:   Mon, 20 Apr 2020 08:29:11 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Zha Qipeng <qipeng.zha@...el.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 19/20] platform/x86: intel_pmc_ipc: Convert to MFD

On Fri, 17 Apr 2020, Andy Shevchenko wrote:

> On Fri, Apr 17, 2020 at 1:56 PM Lee Jones <lee.jones@...aro.org> wrote:
> >
> > On Thu, 16 Apr 2020, Mika Westerberg wrote:
> >
> > > This driver only creates a bunch of platform devices sharing resources
> > > belonging to the PMC device. This is pretty much what MFD subsystem is
> > > for so move the driver there, renaming it to intel_pmc_bxt.c which
> > > should be more clear what it is.
> > >
> > > MFD subsystem provides nice helper APIs for subdevice creation so
> > > convert the driver to use those. Unfortunately the ACPI device includes
> > > separate resources for most of the subdevices so we cannot simply call
> > > mfd_add_devices() to create all of them but instead we need to call it
> > > separately for each device.
> > >
> > > The new MFD driver continues to expose two sysfs attributes that allow
> > > userspace to send IPC commands to the PMC/SCU to avoid breaking any
> > > existing applications that may use these. Generally this is bad idea so
> > > document this in the ABI documentation.
> > >
> > > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > ---
> > >  .../ABI/obsolete/sysfs-driver-intel_pmc_bxt   |  22 +
> > >  arch/x86/include/asm/intel_pmc_ipc.h          |  47 --
> > >  arch/x86/include/asm/intel_telemetry.h        |   1 +
> > >  drivers/mfd/Kconfig                           |  16 +-
> > >  drivers/mfd/Makefile                          |   1 +
> > >  drivers/mfd/intel_pmc_bxt.c                   | 468 +++++++++++++
> > >  drivers/platform/x86/Kconfig                  |  16 +-
> > >  drivers/platform/x86/Makefile                 |   1 -
> > >  drivers/platform/x86/intel_pmc_ipc.c          | 645 ------------------
> > >  .../platform/x86/intel_telemetry_debugfs.c    |  12 +-
> > >  drivers/platform/x86/intel_telemetry_pltdrv.c |   2 +
> > >  drivers/usb/typec/tcpm/Kconfig                |   2 +-
> > >  drivers/watchdog/iTCO_wdt.c                   |  25 +-
> > >  include/linux/mfd/intel_pmc_bxt.h             |  53 ++
> > >  include/linux/platform_data/itco_wdt.h        |  11 +-
> > >  15 files changed, 602 insertions(+), 720 deletions(-)
> > >  create mode 100644 Documentation/ABI/obsolete/sysfs-driver-intel_pmc_bxt
> > >  delete mode 100644 arch/x86/include/asm/intel_pmc_ipc.h
> > >  create mode 100644 drivers/mfd/intel_pmc_bxt.c
> > >  delete mode 100644 drivers/platform/x86/intel_pmc_ipc.c
> > >  create mode 100644 include/linux/mfd/intel_pmc_bxt.h
> >
> > Looks good to me know.
> >
> > Thanks for taking the time to realise my review comments.
> >
> > For my own reference (apply this as-is to your sign-off block):
> >
> >   Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> 
> Can you prepare ib for ii that I can pull from?
> Or do you want me to do the same for you?

It would probably be easier for me to do it, as I already have the
infra. to deal with it.  I have some more reviews to conduct, then
I'll get around to it.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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