On 11/14/2017 02:20 PM, Eugeniy Paltsev wrote: > Add option to set initial output frequency of plls via > "clock-frequency" property in pll's device tree node. > This frequency will be set while pll driver probed. > > The usage example is setting CPU clock frequency on boot > See discussion: > https://www.mail-archive.com/linux-snps-arc@lists.infradead.org/msg02689.html > > Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com> > --- > .../bindings/clock/snps,hsdk-pll-clock.txt | 5 ++++ > .../devicetree/bindings/clock/snps,pll-clock.txt | 5 ++++ > drivers/clk/axs10x/pll_clock.c | 34 > ++++++++++++++++++++-- > drivers/clk/clk-hsdk-pll.c | 34 > ++++++++++++++++++++-- > 4 files changed, 74 insertions(+), 4 deletions(-) > > diff --git a/Documentation/devicetree/bindings/clock/snps,hsdk-pll-clock.txt > b/Documentation/devicetree/bindings/clock/snps,hsdk-pll-clock.txt > index c56c755..5703059 100644 > --- a/Documentation/devicetree/bindings/clock/snps,hsdk-pll-clock.txt > +++ b/Documentation/devicetree/bindings/clock/snps,hsdk-pll-clock.txt > @@ -13,6 +13,10 @@ Required properties: > - clocks: shall be the input parent clock phandle for the PLL. > - #clock-cells: from common clock binding; Should always be set to 0. > > +Optional properties: > +- clock-frequency: output frequency generated by pll in Hz which will be set > +while probing. Should be a single cell. > + > Example: > input_clk: input-clk { > clock-frequency = <33333333>; > @@ -25,4 +29,5 @@ Example: > reg = <0x00 0x10>; > #clock-cells = <0>; > clocks = <&input_clk>; > + clock-frequency = <1000000000>; > }; > diff --git a/Documentation/devicetree/bindings/clock/snps,pll-clock.txt > b/Documentation/devicetree/bindings/clock/snps,pll-clock.txt > index 11fe487..5908f99 100644 > --- a/Documentation/devicetree/bindings/clock/snps,pll-clock.txt > +++ b/Documentation/devicetree/bindings/clock/snps,pll-clock.txt > @@ -13,6 +13,10 @@ registers and second for corresponding LOCK CGU register. > - clocks: shall be the input parent clock phandle for the PLL. > - #clock-cells: from common clock binding; Should always be set to 0. > > +Optional properties: > +- clock-frequency: output frequency generated by pll in Hz which will be set > +while probing. Should be a single cell. > + > Example: > input-clk: input-clk { > clock-frequency = <33333333>; > @@ -25,4 +29,5 @@ Example: > reg = <0x80 0x10>, <0x100 0x10>; > #clock-cells = <0>; > clocks = <&input-clk>; > + clock-frequency = <100000000>; > };
You may check Documentation/devicetree/bindings/clock/clock-bindings.txt about how to assign initial clock rates, in general 'clock-frequency' property is a property of clock consumers with two exceptions of simple clock sources, namely it is used in fixed clock and PWM clock bindings. -- With best wishes, Vladimir _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
