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

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Message-Id: <20250124-clk-ssc-v1-0-2d39f6baf2af@nxp.com>
Date: Fri, 24 Jan 2025 22:25:16 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Russell King <linux@...linux.org.uk>, 
 Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>, 
 Dario Binacchi <dario.binacchi@...rulasolutions.com>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, imx@...ts.linux.dev, 
 Peng Fan <peng.fan@....com>
Subject: [PATCH 0/3] clk: Support spread spectrum and use it in clk-scmi

- 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. The pull request for this property is at [1]
  This property is parsed before parsing clock rate.

- Enable this feature for clk-scmi on i.MX95.
  This may not the best, since checking machine compatibles.
  I am thinking to provide an API scmi_get_vendor_info, then driver
  could use it for OEM stuff, such as
  if (scmi_get_vendor_info returns NXP_IMX)
      ops->set_spread_spectrum = scmi_clk_set_spread_spectrum_imx;

[1] https://github.com/devicetree-org/dt-schema/pull/154

Signed-off-by: Peng Fan <peng.fan@....com>
---
Peng Fan (3):
      clk: Introduce clk_set_spread_spectrum
      clk: conf: Support assigned-clock-sscs
      clk: scmi: Support spread spectrum

 drivers/clk/clk-conf.c        | 68 +++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/clk-scmi.c        | 37 +++++++++++++++++++++++
 drivers/clk/clk.c             | 39 +++++++++++++++++++++++++
 include/linux/clk-provider.h  | 22 ++++++++++++++
 include/linux/clk.h           | 22 ++++++++++++++
 include/linux/scmi_protocol.h |  5 ++++
 6 files changed, 193 insertions(+)
---
base-commit: 5ffa57f6eecefababb8cbe327222ef171943b183
change-id: 20250124-clk-ssc-fccd4f60d7e5

Best regards,
-- 
Peng Fan <peng.fan@....com>