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SubjectRe: [PATCH v5 13/14] dt-bindings: cpufreq: Document operating-points-v2-kryo-cpu
On 03-05-18, 14:52, Ilia Lin wrote:
> In Certain Qualcomm Technologies, Inc. SoCs like apq8096 and msm8996
> that have KRYO processors, the CPU ferequencies subset and voltage value
> of each OPP varies based on the silicon variant in use.
> Qualcomm Technologies, Inc. Process Voltage Scaling Tables
> defines the voltage and frequency value based on the msm-id in SMEM
> and speedbin blown in the efuse combination.
> The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
> to provide the OPP framework with required information.
> This is used to determine the voltage and frequency value for each OPP of
> operating-points-v2 table when it is parsed by the OPP framework.
>
> This change adds documentation.
>
> Signed-off-by: Ilia Lin <ilialin@codeaurora.org>
> ---
> .../devicetree/bindings/opp/kryo-cpufreq.txt | 693 +++++++++++++++++++++
> 1 file changed, 693 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/opp/kryo-cpufreq.txt
>
> diff --git a/Documentation/devicetree/bindings/opp/kryo-cpufreq.txt b/Documentation/devicetree/bindings/opp/kryo-cpufreq.txt
> new file mode 100644
> index 0000000..20cef9d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/opp/kryo-cpufreq.txt
> @@ -0,0 +1,693 @@
> +Qualcomm Technologies, Inc. KRYO CPUFreq and OPP bindings
> +===================================
> +
> +In Certain Qualcomm Technologies, Inc. SoCs like apq8096 and msm8996
> +that have KRYO processors, the CPU ferequencies subset and voltage value
> +of each OPP varies based on the silicon variant in use.
> +Qualcomm Technologies, Inc. Process Voltage Scaling Tables
> +defines the voltage and frequency value based on the msm-id in SMEM
> +and speedbin blown in the efuse combination.
> +The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
> +to provide the OPP framework with required information (existing HW bitmap).
> +This is used to determine the voltage and frequency value for each OPP of
> +operating-points-v2 table when it is parsed by the OPP framework.
> +
> +Required properties:
> +--------------------
> +In 'cpus' nodes:
> +- operating-points-v2: Phandle to the operating-points-v2 table to use.
> +
> +In 'operating-points-v2' table:
> +- compatible: Should be
> + - 'operating-points-v2-kryo-cpu' for apq8096 and msm8996.
> +- nvmem-cells: A phandle pointing to a nvmem-cells node representing the
> + efuse registers that has information about the
> + speedbin that is used to select the right frequency/voltage
> + value pair.
> + Please refer the for nvmem-cells
> + bindings Documentation/devicetree/bindings/nvmem/nvmem.txt
> + and also examples below.
> +
> +In every OPP node:
> +- opp-supported-hw: A single 32 bit bitmap value, representing compatible HW.
> + Bitmap:
> + 0: MSM8996 V3, speedbin 0
> + 1: MSM8996 V3, speedbin 1
> + 2: MSM8996 V3, speedbin 2
> + 3: unused
> + 4: MSM8996 SG, speedbin 0
> + 5: MSM8996 SG, speedbin 1
> + 6: MSM8996 SG, speedbin 2
> + 7-31: unused
> +
> +Example 1:
> +---------
> +
> + cpus {
> + #address-cells = <2>;
> + #size-cells = <0>;
> +
> + CPU0: cpu@0 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x0>;
> + enable-method = "psci";
> + clocks = <&kryocc 0>;
> + cpu-supply = <&pm8994_s11_saw>;
> + operating-points-v2 = <&cluster0_opp>;
> + /* cooling options */
> + cooling-min-level = <0>;
> + cooling-max-level = <15>;

cooling min/max aren't required anymore, as I told you in the previous
version :)

> + cluster0_opp: opp_table0 {
> + compatible = "operating-points-v2-kryo-cpu";
> + nvmem-cells = <&speedbin_efuse>;
> + opp-shared;
> +
> + opp-307200000 {
> + opp-hz = /bits/ 64 < 307200000 >;

You fixed spacing around frequency values in the dts but not here.

> + opp-microvolt = <905000 905000 1140000>;
> + opp-supported-hw = <0x77>;
> + clock-latency-ns = <200000>;
> + };

--
viresh

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