On Sun, Jan 05, 2025 at 07:14:16PM +0100, Dario Binacchi wrote: > The addition of DT bindings for enabling and tuning spread spectrum > clocking generation is available only for the main PLL. > > Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx> > --- > > .../bindings/clock/st,stm32-rcc.yaml | 27 +++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml > index ae9e5b26d876..c345d3ff3fc4 100644 > --- a/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml > +++ b/Documentation/devicetree/bindings/clock/st,stm32-rcc.yaml > @@ -77,6 +77,26 @@ properties: > Phandle to system configuration controller. It can be used to control the > power domain circuitry. > > + st,ssc-modfreq-hz: > + description: > + The modulation frequency for main PLL (in Hz) No constraints? > + > + st,ssc-moddepth-permyriad: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + The modulation rate for main PLL (in permyriad, i.e. 0.01%) > + minimum: 25 > + maximum: 200 > + > + st,ssc-modmethod: > + $ref: /schemas/types.yaml#/definitions/non-unique-string-array > + description: > + The modulation techniques for main PLL. > + items: > + enum: > + - center-spread > + - down-spread What's the default? If there's only 2 possibilities, then you can use a boolean instead. Though I assume you want to support spread-spectrum disabled. Are there dependencies between these properties? > + > required: > - compatible > - reg > @@ -97,6 +117,10 @@ allOf: > const: 1 > description: | > The clock index for the specified type. > + st,ssc-modfreq-hz: false > + st,ssc-moddepth-permyriad: false > + st,ssc-modmethod: false > + > else: > properties: > '#clock-cells': > @@ -118,6 +142,9 @@ examples: > reg = <0x40023800 0x400>; > clocks = <&clk_hse>, <&clk_i2s_ckin>; > st,syscfg = <&pwrcfg>; > + st,ssc-modfreq-hz = <10000>; > + st,ssc-moddepth-permyriad = <200>; > + st,ssc-modmethod = "center-spread"; > }; > > - | > -- > 2.43.0 >
