linux-kernel - Re: [PATCH 0/3] clk: Support spread spectrum and use it in clk-scmi

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Message-ID: <20250827070505.GA18994@nxa18884-linux.ap.freescale.net>
Date: Wed, 27 Aug 2025 15:05:05 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Peng Fan <peng.fan@....com>
Cc: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Marco Felsch <m.felsch@...gutronix.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/3] clk: Support spread spectrum and use it in clk-scmi

Hi Stephen, Sudeep, Cristian

On Tue, Aug 12, 2025 at 08:17:04PM +0800, Peng Fan wrote:
>Since the assigned-clock-sscs property [1] has been accepted into the device
>tree schema, we can now support it in the Linux clock driver. Therefore,
>I’ve picked up the previously submitted work [2] titled “clk: Support
>spread spectrum and use it in clk-pll144x and clk-scmi.”
>As more than six months have passed since [2] was posted, I’m treating this
>patchset as a new submission rather than a v3.
>
>- Introduce clk_set_spread_spectrum to set the parameters for enabling
>  spread spectrum of a clock.
>- Parse 'assigned-clock-sscs' and configure it by default before using the
>  clock. This property is parsed before parsing clock rate.
>- Enable this feature for clk-scmi on i.MX95.
>
>Because SCMI spec will not include spread spectrum as a standard
>extension, we still need to use NXP i.MX OEM extension.

I only got a comment from Dan until now, before I post V2, I would like
to see if CLK and SCMI maintainer's have any comments. Or I need to wait
a bit more time, please just drop me a message.

Thanks,
Peng

>
>[1] https://github.com/devicetree-org/dt-schema/pull/154
>[2] https://lore.kernel.org/all/20250205-clk-ssc-v2-0-fa73083caa92@nxp.com/
>
>Signed-off-by: Peng Fan <peng.fan@....com>
>---
>Peng Fan (3):
>      clk: Introduce clk_hw_set_spread_spectrum
>      clk: conf: Support assigned-clock-sscs
>      clk: scmi: Support Spread Spectrum for NXP i.MX95
>
> drivers/clk/clk-conf.c        | 70 +++++++++++++++++++++++++++++++++++++++++++
> drivers/clk/clk-scmi.c        | 64 ++++++++++++++++++++++++++++++++++++---
> drivers/clk/clk.c             | 32 ++++++++++++++++++++
> include/linux/clk-provider.h  | 29 ++++++++++++++++++
> include/linux/scmi_protocol.h |  5 ++++
> 5 files changed, 196 insertions(+), 4 deletions(-)
>---
>base-commit: b1549501188cc9eba732c25b033df7a53ccc341f
>change-id: 20250812-clk-ssc-version1-acf6f6efbd96
>
>Best regards,
>-- 
>Peng Fan <peng.fan@....com>
>