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

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Message-Id: <20250812-clk-ssc-version1-v1-0-cef60f20d770@nxp.com>
Date: Tue, 12 Aug 2025 20:17:04 +0800
From: Peng Fan <peng.fan@....com>
To: 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>
Cc: 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, Peng Fan <peng.fan@....com>
Subject: [PATCH 0/3] clk: Support spread spectrum and use it in clk-scmi

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.

[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>