linux-kernel - Re: [PATCH 2/4] MFD: intel

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Date:   Wed, 30 Jun 2021 14:11:38 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     hdegoede@...hat.com, mgross@...ux.intel.com, bhelgaas@...gle.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pci@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH 2/4] MFD: intel_pmt: Remove OOBMSM device

On Wed, 2021-06-30 at 11:15 +0100, Lee Jones wrote:
> On Thu, 17 Jun 2021, David E. Box wrote:
> 
> > Unlike the other devices in intel_pmt, the Out of Band Management
> > Services
> > Module (OOBMSM) is actually not a PMT dedicated device. It can also
> > be used
> > to describe non-PMT capabilities. Like PMT, these capabilities are
> > also
> > enumerated using PCIe Vendor Specific registers in config space. In
> > order
> > to better support these devices without the confusion of a
> > dependency on
> > MFD_INTEL_PMT, remove the OOBMSM device from intel_pmt so that it
> > can be
> > later placed in its own driver. Since much of the same code will be
> > used by
> > intel_pmt and the new driver, create a new file with symbols to be
> > used by
> > both.
> > 
> > While performing this split we need to also handle the creation of
> > platform
> > devices for the non-PMT capabilities. Currently PMT devices are
> > named by
> > their capability (e.g. pmt_telemetry). Instead, generically name
> > them by
> > their capability ID (e.g. intel_extnd_cap_2). This allows the IDs
> > to be
> > created automatically.  However, to ensure that unsupported devices
> > aren't
> > created, use an allow list to specify supported capabilities.
> > 
> > Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> > ---
> >  MAINTAINERS                                |   1 +
> >  drivers/mfd/Kconfig                        |   4 +
> >  drivers/mfd/Makefile                       |   1 +
> >  drivers/mfd/intel_extended_caps.c          | 208
> > +++++++++++++++++++++
> 
> Please consider moving this <whatever this is> out to either
> drivers/pci or drivers/platform/x86.

None of the cell drivers are in MFD, only the PCI drivers from which
the cells are created. I understood that these should be in MFD. But
moving it to drivers/platform/x86 would be fine with me. That keeps the
code together in the same subsystem. Comment from Hans or Andy? 

> 
> I suggest Andy should also be on Cc.
> 
> >  drivers/mfd/intel_extended_caps.h          |  40 ++++
> >  drivers/mfd/intel_pmt.c                    | 198 ++---------------
> > ---
> >  drivers/platform/x86/intel_pmt_crashlog.c  |   2 +-
> >  drivers/platform/x86/intel_pmt_telemetry.c |   2 +-
> >  8 files changed, 270 insertions(+), 186 deletions(-)
> >  create mode 100644 drivers/mfd/intel_extended_caps.c
> >  create mode 100644 drivers/mfd/intel_extended_caps.h
>