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From:   "Zhang, Tianfei" <tianfei.zhang@intel.com>
To:     Greg KH <gregkh@linuxfoundation.org>
CC:     "broonie@kernel.org" <broonie@kernel.org>,
        "rafael@kernel.org" <rafael@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Wu, Hao" <hao.wu@intel.com>, "trix@redhat.com" <trix@redhat.com>,
        "Xu, Yilun" <yilun.xu@intel.com>,
        "Weight, Russell H" <russell.h.weight@intel.com>,
        Matthew Gerlach <matthew.gerlach@linux.intel.com>
Subject: RE: [PATCH v1] regmap: add generic indirect regmap support
Thread-Topic: [PATCH v1] regmap: add generic indirect regmap support
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Date:   Tue, 7 Jun 2022 05:57:26 +0000
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> -----Original Message-----
> From: Greg KH <gregkh@linuxfoundation.org>
> Sent: Tuesday, June 7, 2022 12:50 PM
> To: Zhang, Tianfei <tianfei.zhang@intel.com>
> Cc: broonie@kernel.org; rafael@kernel.org; linux-kernel@vger.kernel.org; =
Wu,
> Hao <hao.wu@intel.com>; trix@redhat.com; Xu, Yilun <yilun.xu@intel.com>;
> Weight, Russell H <russell.h.weight@intel.com>; Matthew Gerlach
> <matthew.gerlach@linux.intel.com>
> Subject: Re: [PATCH v1] regmap: add generic indirect regmap support
>=20
> On Mon, Jun 06, 2022 at 09:37:55PM -0400, Tianfei Zhang wrote:
> > From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> >
> > This patch adds support for regmap APIs that are intended to be used
> > by the drivers of some devices which support generic indirect register
> > access, for example PMCI (Platform Management Control Interface)
> > device, HSSI (High Speed Serial Interface) device in FPGA.
> >
> > Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> > Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
> > ---
> >  drivers/base/regmap/Kconfig                   |   3 +
> >  drivers/base/regmap/Makefile                  |   1 +
> >  .../base/regmap/regmap-indirect-register.c    | 133 ++++++++++++++++++
> >  include/linux/regmap.h                        |  12 ++
> >  4 files changed, 149 insertions(+)
> >  create mode 100644 drivers/base/regmap/regmap-indirect-register.c
>=20
> Don't we need users of these before we can take them?

One of user is the PMCI (Platform Management Control Interface) driver of I=
ntel FPGA PAC Card,=20
PMCI device was connected to card BMC which provided telemetry and mailbox =
functionalities.

The PMCI driver is under review now:
https://lore.kernel.org/all/20220607032833.3482-1-tianfei.zhang@intel.com/