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@nxp.com>
---
Changes in v2:
- Simplify the code in patch 2 per Dan Carpenter and Brian Masney
- Rebased to next-20250829
- Link to v1: https://lore.kernel.org/r/20250812-clk-ssc-version1-v1-0-cef60f20d770@nxp.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 | 69 +++++++++++++++++++++++++++++++++++++++++++
drivers/clk/clk-scmi.c | 64 ++++++++++++++++++++++++++++++++++++---
drivers/clk/clk.c | 26 ++++++++++++++++
include/linux/clk-provider.h | 26 ++++++++++++++++
include/linux/scmi_protocol.h | 5 ++++
5 files changed, 186 insertions(+), 4 deletions(-)
---
base-commit: ef1ec3476bc4f1db6c9da36d66d9f57bb0d02734
change-id: 20250812-clk-ssc-version1-acf6f6efbd96
Best regards,
--
Peng Fan <peng.fan@nxp.com>