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SubjectRe: [PATCH V4 1/9] PM / OPP: Allow OPP table to be used for power-domains
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On 20/03/17 09:32, Viresh Kumar wrote:
[...]

> +
> +Example 7: domain-Performance-state:
> +(example: For 1GHz require domain state 1 and for 1.1 & 1.2 GHz require state 2)
> +
> +/ {
> + domain_opp_table: opp_table0 {
> + compatible = "operating-points-v2";
> +
> + opp@1 {
> + domain-performance-state = <1>;
> + opp-microvolt = <975000 970000 985000>;
> + };
> + opp@2 {
> + domain-performance-state = <2>;
> + opp-microvolt = <1075000 1000000 1085000>;
> + };
> + };
> +
> + foo_domain: power-controller@12340000 {
> + compatible = "foo,power-controller";
> + reg = <0x12340000 0x1000>;
> + #power-domain-cells = <0>;
> + operating-points-v2 = <&domain_opp_table>;
> + }
> +
> + cpu0_opp_table: opp_table1 {
> + compatible = "operating-points-v2";
> + opp-shared;
> +
> + opp@1000000000 {
> + opp-hz = /bits/ 64 <1000000000>;
> + domain-performance-state = <1>;
> + };
> + opp@1100000000 {
> + opp-hz = /bits/ 64 <1100000000>;
> + domain-performance-state = <2>;
> + };
> + opp@1200000000 {
> + opp-hz = /bits/ 64 <1200000000>;
> + domain-performance-state = <2>;
> + };
> + };
> +
> + cpus {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + cpu@0 {
> + compatible = "arm,cortex-a9";
> + reg = <0>;
> + clocks = <&clk_controller 0>;
> + clock-names = "cpu";
> + operating-points-v2 = <&cpu0_opp_table>;
> + power-domains = <&foo_domain>;
> + };
> + };
> +};


Thinking more about this above example, I think you need more
explanation. So in the above case you have cpu with clock controller,
power-domain and the OPP table info, I can think of few things that need
to be explicit:

1. How does the precedence look like ?

2. Since power-domains with OPP table control the performance state, do
we ignore clock and operating-points-v2 in the above case completely?

3. Will the power-domain drive the OPP ?

--
Regards,
Sudeep

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