From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Mark Brown <broonie@kernel.org>
Cc: Daniel Scally <djrscally@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Platform Driver <platform-driver-x86@vger.kernel.org>,
Hans de Goede <hdegoede@redhat.com>,
Mark Gross <mgross@linux.intel.com>,
Maximilian Luz <luzmaximilian@gmail.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
kieran.bingham@ideasonboard.com
Subject: Re: [RFC PATCH 0/2] Add software node support to regulator framework
Date: Tue, 13 Jul 2021 22:46:29 +0300 [thread overview]
Message-ID: <CAHp75Vfwz-cDrAhOnXaeUSDN-K+YJv8ahmvZ3aJwm2sKqc8HeQ@mail.gmail.com> (raw)
In-Reply-To: <20210713181837.GE4098@sirena.org.uk>
On Tue, Jul 13, 2021 at 9:19 PM Mark Brown <broonie@kernel.org> wrote:
>
> On Tue, Jul 13, 2021 at 06:55:59PM +0300, Andy Shevchenko wrote:
> > On Tue, Jul 13, 2021 at 6:25 PM Mark Brown <broonie@kernel.org> wrote:
>
> > > The driver code is trivial boilerplate, assuming someone doesn't go and
> > > implement a helper to register stuff separately like I suggested. The
> > > proposed swnode stuff would involve duplicating the DT parsing code.
> > > This seems like a whole lot of effort for something that provides a
> > > worse result than either of the existing things.
>
> > I'm not sure I follow. Where did you see the duplication when I saw
> > the other way around?
>
> The current patch consists entirely of additions, it does not remove any
> existing code at all, the diffstat is:
>
> 5 files changed, 174 insertions(+)
Ah, okay, you are talking with regard to the current patch. I talked
in generic terms.
> > Converting code from OF to fwnode APIs in most cases is smooth and
> > doesn't add any overhead to the codebase,
>
> We explicitly do not want to attempt to parse regulator properties out
> of ACPI platform descriptions because using the regulator binding on
> ACPI platforms conflicts with the ACPI model for power management and
> we really don't want to encourage platforms to attempt to mix and match
> here, it's not going to lead to anything robust. System integrators
> that need this sort of OS visible low level power management really
> should be working with the UEFI forum to get an ACPI specification for
> it, or if they don't really need it fixing up their AML to DTRT.
No-one is objecting to this. I agree that integration of regulators
and ACPI should be done in a specific way if needed at all.
> If you were to say that we could bodge around that by somehow forcing
> this binding to exist only for swnodes when running on ACPI systems then
> we'd still have the problems with creating something with worse tooling
> than what's there already.
Of course, no objections to this.
> Like I said in the other mail fwnode is a nice hack for systems that are
> using ACPI but have hardware that's doing something totally outside the
> ACPI model to allow them to reuse work that's been done for DT, it's not
> a universal solution to the lack of appropriate support for describing
> modern systems in ACPI.
In some (I suppose rear) cases it may be used by DT-enabled platforms as well.
I can imagine the case when you have a system in ROM and only what you
can do to change DTB there is either use DT overlays (which seems to
be not working, plenty of gaps there according to a Wiki I saw once)
or do something in the board files.
So, if you replace "ACPI" with the "firmware resource provider" in the
above paragraph, I will agree 100% with you.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-07-13 19:47 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-08 22:42 [RFC PATCH 0/2] Add software node support to regulator framework Daniel Scally
2021-07-08 22:42 ` [RFC PATCH 1/2] regulator: Add support for software node connections Daniel Scally
2021-07-09 17:26 ` Mark Brown
2021-07-08 22:42 ` [RFC PATCH 2/2] platform/surface: Add Surface Go 2 board file Daniel Scally
2021-07-09 17:40 ` Mark Brown
2021-07-09 17:04 ` [RFC PATCH 0/2] Add software node support to regulator framework Mark Brown
2021-07-10 22:48 ` Daniel Scally
2021-07-12 14:15 ` Mark Brown
2021-07-12 16:55 ` Laurent Pinchart
2021-07-12 17:32 ` Mark Brown
2021-07-11 9:37 ` Andy Shevchenko
2021-07-12 12:42 ` Mark Brown
2021-07-12 13:01 ` Andy Shevchenko
2021-07-12 13:34 ` Mark Brown
2021-07-12 16:08 ` Andy Shevchenko
2021-07-12 17:01 ` Mark Brown
2021-07-12 23:32 ` Daniel Scally
2021-07-13 15:24 ` Mark Brown
2021-07-13 15:42 ` Laurent Pinchart
2021-07-13 16:02 ` Mark Brown
2021-07-13 16:06 ` Laurent Pinchart
2021-07-13 18:24 ` Mark Brown
2021-07-13 15:55 ` Andy Shevchenko
2021-07-13 18:18 ` Mark Brown
2021-07-13 19:46 ` Andy Shevchenko [this message]
2021-07-14 16:05 ` Mark Brown
2021-07-14 7:25 ` Laurent Pinchart
2021-07-14 16:59 ` Mark Brown
2021-07-14 17:18 ` Laurent Pinchart
2021-07-14 17:28 ` Mark Brown
2021-07-14 17:41 ` Laurent Pinchart
2021-07-14 19:18 ` Mark Brown
2021-07-14 21:53 ` Laurent Pinchart
2021-07-13 22:06 ` Daniel Scally
2021-07-10 22:28 ` Laurent Pinchart
2021-07-10 22:54 ` Daniel Scally
2021-07-11 16:55 ` Laurent Pinchart
2021-07-12 8:13 ` Daniel Scally
2021-07-12 11:50 ` Laurent Pinchart
2021-07-12 13:23 ` Mark Brown
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