linux-kernel - Re: [RFC PATCH v2 1/5] clk: meson: axg: move reset controller's code to separate module

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Date: Mon, 8 Apr 2024 18:05:51 +0100
From: Conor Dooley <conor@...nel.org>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Jan Dakinevich <jan.dakinevich@...utedevices.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Kevin Hilman <khilman@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v2 1/5] clk: meson: axg: move reset controller's code
 to separate module

On Mon, Apr 08, 2024 at 02:52:37AM -0700, Stephen Boyd wrote:
> Quoting Philipp Zabel (2024-04-08 01:21:47)
> > On So, 2024-04-07 at 19:39 -0700, Stephen Boyd wrote:
> > > Quoting Jerome Brunet (2024-04-02 07:52:38)
> > > > 
> > > > On Thu 28 Mar 2024 at 04:08, Jan Dakinevich <jan.dakinevich@...utedevices.com> wrote:
> > > > 
> > > > > This code will by reused by A1 SoC.
> > > > 
> > > > Could expand a bit please ?
> > > > 
> > > > > 
> > > > > Signed-off-by: Jan Dakinevich <jan.dakinevich@...utedevices.com>
> > > > 
> > > > In general, I like the idea.
> > > > 
> > > > We do have a couple a reset registers lost in middle of clocks and this
> > > > change makes it possible to re-use the code instead duplicating it.
> > > > 
> > > > The exported function would be used by audio clock controllers, but the
> > > > module created would be purely about reset.
> > > > 
> > > > One may wonder how it ended up in the clock tree, especially since the
> > > > kernel as a reset tree too.
> > > > 
> > > > I'm not sure if this should move to the reset framework or if it would
> > > > be an unnecessary churn. Stephen, Philipp, do you have an opinion on
> > > > this ?
> > > > 
> > > 
> > > I'd prefer it be made into an auxiliary device and the driver put in
> > > drivers/reset/ so we can keep reset code in the reset directory.
> > 
> > Seconded, the clk-mpfs/reset-mpfs and clk-starfive-jh7110-sys/reset-
> > starfive-jh7110 drivers are examples of this.
> > 
> > > The auxiliary device creation function can also be in the
> > > drivers/reset/ directory so that the clk driver calls some function
> > > to create and register the device.
> > 
> > I'm undecided about this, do you think mpfs_reset_controller_register()
> > and jh7110_reset_controller_register() should rather live with the
> > reset aux drivers in drivers/reset/ ?
> 
> Yes, and also mpfs_reset_read() and friends. We should pass the base
> iomem pointer and parent device to mpfs_reset_adev_alloc() instead and
> then move all that code into drivers/reset with some header file
> exported function to call. That way the clk driver hands over the data
> without having to implement half the implementation.

I'll todo list that :)

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