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Date: Thu, 8 Feb 2018 20:54:49 -0600
From: Rob Herring <robh@...nel.org>
To: Sricharan R <sricharan@...eaurora.org>
Cc: viresh.kumar@...aro.org, mark.rutland@....com,
mturquette@...libre.com, sboyd@...eaurora.org,
linux@...linux.org.uk, andy.gross@...aro.org,
david.brown@...aro.org, rjw@...ysocki.net,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH v6 15/15] dt-bindings: cpufreq: Document
operating-points-v2-krait-cpu
On Tue, Feb 06, 2018 at 09:38:28AM +0530, Sricharan R wrote:
> In Certain QCOM SoCs like ipq8064, apq8064, msm8960, msm8974
> that has KRAIT processors the voltage/current value of each OPP
> varies based on the silicon variant in use.
> operating-points-v2-krait-cpu specifies the phandle to nvmem efuse cells
> and the operating-points-v2 table for each opp. The qcom-cpufreq driver
> reads the efuse value from the SoC to provide the required information
> that is used to determine the voltage and current value for each OPP of
> operating-points-v2 table when it is parsed by the OPP framework.
>
> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
> ---
> .../devicetree/bindings/cpufreq/krait-cpufreq.txt | 363 +++++++++++++++++++++
> 1 file changed, 363 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/cpufreq/krait-cpufreq.txt
>
> diff --git a/Documentation/devicetree/bindings/cpufreq/krait-cpufreq.txt b/Documentation/devicetree/bindings/cpufreq/krait-cpufreq.txt
> new file mode 100644
> index 0000000..e7351f7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/cpufreq/krait-cpufreq.txt
> @@ -0,0 +1,363 @@
> +QCOM KRAIT CPUFreq and OPP bindings
> +===================================
> +
> +In Certain QCOM SoCs like ipq8064, apq8064, msm8960, msm8974
> +that has KRAIT processors the voltage value of each OPP varies
> +based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables
> +defines the voltage and current value based on the speed/pvs/version
> +combination blown in the efuse. The qcom-cpufreq driver reads the efuse
> +value from the SoC to provide the OPP framework with required information.
> +This is used to determine the voltage and current 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-krait-cpu' for ipq8064, apq8064, msm8960,
> + msm8974.
> +- nvmem-cells: A phandle pointing to a nvmem-cells node representing the
> + efuse registers that has information about the
> + speedbin/pvs/version that is used to select the right
> + voltage/current value pair. Note that the length field of the
> + nvmem-cell is used to differentiate between format 'A' or 'B'
> + efuse settings. len of '4' bytes is for format 'A' and '8'
> + bytes for format 'B'. Please refer the for nvmem-cells
> + bindings Documentation/devicetree/bindings/nvmem/nvmem.txt
> + and also examples below for both the cases.
> +Example 1:
> +---------
> +
> +/* For arch/arm/boot/dts/apq8064.dtsi --> format 'A' */
> +cpus {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + CPU0: cpu@0 {
> + compatible = "qcom,krait";
> + enable-method = "qcom,kpss-acc-v1";
> + device_type = "cpu";
> + reg = <0>;
> + next-level-cache = <&L2>;
> + qcom,acc = <&acc0>;
> + qcom,saw = <&saw0>;
> + cpu-idle-states = <&CPU_SPC>;
> + operating-points-v2 = <&cpu_opp_table>;
> + };
> +};
> +
> +qfprom: qfprom@...000 {
> + compatible = "qcom,qfprom";
> + reg = <0x00700000 0x1000>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> + pvs_efuse: pvs {
> + reg = <0xc0 0x4>;
> + };
> +};
> +
> +cpu_opp_table: opp-table {
> + compatible = "operating-points-v2-krait-cpu";
> + nvmem-cells = <&pvs_efuse>;
> +
> + /*
> + * Missing opp-shared property means CPUs switch DVFS states
> + * independently.
> + */
> +
> + opp-918000000 {
> + opp-hz = /bits/ 64 <918000000>;
> + opp-microvolt-speed0-pvs0-v0 = <1100000>;
Where is this property defined? I'm not that happy with it, but don't
have a better suggestion. Maybe make pvsN be an array of values with 0
for any skipped indexes? The '-v0' seems pointless.
> + opp-microvolt-speed0-pvs1-v0 = <1050000>;
> + opp-microvolt-speed0-pvs3-v0 = <1000000>;
> + opp-microvolt-speed0-pvs4-v0 = <975000>;
> + opp-microvolt-speed1-pvs0-v0 = <1025000>;
> + opp-microvolt-speed1-pvs1-v0 = <1000000>;
> + opp-microvolt-speed1-pvs2-v0 = <950000>;
> + opp-microvolt-speed1-pvs3-v0 = <925000>;
> + opp-microvolt-speed1-pvs4-v0 = <900000>;
> + opp-microvolt-speed1-pvs5-v0 = <900000>;
> + opp-microvolt-speed1-pvs6-v0 = <900000>;
> + opp-microvolt-speed2-pvs0-v0 = <975000>;
> + opp-microvolt-speed2-pvs1-v0 = <950000>;
> + opp-microvolt-speed2-pvs2-v0 = <925000>;
> + opp-microvolt-speed2-pvs3-v0 = <912500>;
> + opp-microvolt-speed2-pvs4-v0 = <900000>;
> + opp-microvolt-speed2-pvs5-v0 = <900000>;
> + opp-microvolt-speed2-pvs6-v0 = <900000>;
> + opp-microvolt-speed14-pvs0-v0 = <1025000>;
> + opp-microvolt-speed14-pvs1-v0 = <1000000>;
> + opp-microvolt-speed14-pvs2-v0 = <950000>;
> + opp-microvolt-speed14-pvs3-v0 = <925000>;
> + opp-microvolt-speed14-pvs4-v0 = <900000>;
> + opp-microvolt-speed14-pvs5-v0 = <900000>;
> + opp-microvolt-speed14-pvs6-v0 = <900000>;
> + };
> +
> + opp-810000000 {
> + opp-hz = /bits/ 64 <810000000>;
> + opp-microvolt-speed0-pvs0-v0 = < 1075000>;
> + opp-microvolt-speed0-pvs1-v0 = < 1025000>;
> + opp-microvolt-speed0-pvs3-v0 = < 975000>;
> + opp-microvolt-speed0-pvs3-v0 = < 962500>;
> + opp-microvolt-speed1-pvs0-v0 = < 1000000>;
> + opp-microvolt-speed1-pvs1-v0 = < 975000>;
> + opp-microvolt-speed1-pvs2-v0 = < 937500>;
> + opp-microvolt-speed1-pvs3-v0 = < 900000>;
> + opp-microvolt-speed1-pvs4-v0 = < 887500>;
> + opp-microvolt-speed1-pvs5-v0 = < 887500>;
> + opp-microvolt-speed1-pvs6-v0 = < 887500>;
> + opp-microvolt-speed2-pvs0-v0 = < 962500>;
> + opp-microvolt-speed2-pvs1-v0 = < 937500>;
> + opp-microvolt-speed2-pvs2-v0 = < 912500>;
> + opp-microvolt-speed2-pvs3-v0 = < 900000>;
> + opp-microvolt-speed2-pvs4-v0 = < 887500>;
> + opp-microvolt-speed2-pvs5-v0 = < 887500>;
> + opp-microvolt-speed2-pvs6-v0 = < 887500>;
Some space then tab issues on the above. Also, drop the space after the
'<'.
> + opp-microvolt-speed14-pvs0-v0 = < 1000000>;
> + opp-microvolt-speed14-pvs1-v0 = < 975000>;
> + opp-microvolt-speed14-pvs2-v0 = < 937500>;
> + opp-microvolt-speed14-pvs3-v0 = < 900000>;
> + opp-microvolt-speed14-pvs4-v0 = < 887500>;
> + opp-microvolt-speed14-pvs5-v0 = < 887500>;
> + opp-microvolt-speed14-pvs6-v0 = < 887500>;
> + };
> +
> + opp-702000000 {
> + opp-hz = /bits/ 64 <702000000>;
> + opp-microvolt-speed0-pvs0-v0 = <1025000>;
> + opp-microvolt-speed0-pvs1-v0 = <975000>;
> + opp-microvolt-speed0-pvs3-v0 = <925000>;
> + opp-microvolt-speed0-pvs3-v0 = <925000>;
> + opp-microvolt-speed1-pvs0-v0 = <962500>;
> + opp-microvolt-speed1-pvs1-v0 = <962500>;
> + opp-microvolt-speed1-pvs2-v0 = <925000>;
> + opp-microvolt-speed1-pvs3-v0 = <900000>;
> + opp-microvolt-speed1-pvs4-v0 = <875000>;
> + opp-microvolt-speed1-pvs5-v0 = <875000>;
> + opp-microvolt-speed1-pvs6-v0 = <875000>;
> + opp-microvolt-speed2-pvs0-v0 = <950000>;
> + opp-microvolt-speed2-pvs1-v0 = <925000>;
> + opp-microvolt-speed2-pvs2-v0 = <900000>;
> + opp-microvolt-speed2-pvs3-v0 = <900000>;
> + opp-microvolt-speed2-pvs4-v0 = <875000>;
> + opp-microvolt-speed2-pvs5-v0 = <875000>;
> + opp-microvolt-speed2-pvs6-v0 = <875000>;
> + opp-microvolt-speed14-pvs0-v0 = <962500>;
> + opp-microvolt-speed14-pvs1-v0 = <962500>;
> + opp-microvolt-speed14-pvs2-v0 = <925000>;
> + opp-microvolt-speed14-pvs3-v0 = <900000>;
> + opp-microvolt-speed14-pvs4-v0 = <875000>;
> + opp-microvolt-speed14-pvs5-v0 = <875000>;
> + opp-microvolt-speed14-pvs6-v0 = <875000>;
> + };
> +
> + opp-594000000 {
> + opp-hz = /bits/ 64 <594000000>;
> + opp-microvolt-speed0-pvs0-v0 = <1000000>;
> + opp-microvolt-speed0-pvs1-v0 = <950000>;
> + opp-microvolt-speed0-pvs3-v0 = <900000>;
> + opp-microvolt-speed0-pvs3-v0 = <900000>;
> + opp-microvolt-speed1-pvs0-v0 = <950000>;
> + opp-microvolt-speed1-pvs1-v0 = <950000>;
> + opp-microvolt-speed1-pvs2-v0 = <925000>;
> + opp-microvolt-speed1-pvs3-v0 = <900000>;
> + opp-microvolt-speed1-pvs4-v0 = <875000>;
> + opp-microvolt-speed1-pvs5-v0 = <875000>;
> + opp-microvolt-speed1-pvs6-v0 = <875000>;
> + opp-microvolt-speed2-pvs0-v0 = <950000>;
> + opp-microvolt-speed2-pvs1-v0 = <925000>;
> + opp-microvolt-speed2-pvs2-v0 = <900000>;
> + opp-microvolt-speed2-pvs3-v0 = <900000>;
> + opp-microvolt-speed2-pvs4-v0 = <875000>;
> + opp-microvolt-speed2-pvs5-v0 = <875000>;
> + opp-microvolt-speed2-pvs6-v0 = <875000>;
More space then tab issues after the '='.
> + opp-microvolt-speed14-pvs0-v0 = <950000>;
> + opp-microvolt-speed14-pvs1-v0 = <950000>;
> + opp-microvolt-speed14-pvs2-v0 = <925000>;
> + opp-microvolt-speed14-pvs3-v0 = <900000>;
> + opp-microvolt-speed14-pvs4-v0 = <875000>;
> + opp-microvolt-speed14-pvs5-v0 = <875000>;
> + opp-microvolt-speed14-pvs6-v0 = <875000>;
> + };
> +
> + opp-486000000 {
> + opp-hz = /bits/ 64 <486000000>;
> + opp-microvolt-speed0-pvs0-v0 = <975000>;
> + opp-microvolt-speed0-pvs1-v0 = <925000>;
> + opp-microvolt-speed0-pvs3-v0 = <875000>;
> + opp-microvolt-speed0-pvs3-v0 = <875000>;
> + opp-microvolt-speed1-pvs0-v0 = <950000>;
> + opp-microvolt-speed1-pvs1-v0 = <950000>;
> + opp-microvolt-speed1-pvs2-v0 = <925000>;
> + opp-microvolt-speed1-pvs3-v0 = <900000>;
> + opp-microvolt-speed1-pvs4-v0 = <875000>;
> + opp-microvolt-speed1-pvs5-v0 = <875000>;
> + opp-microvolt-speed1-pvs6-v0 = <875000>;
> + opp-microvolt-speed2-pvs0-v0 = <950000>;
> + opp-microvolt-speed2-pvs1-v0 = <925000>;
> + opp-microvolt-speed2-pvs2-v0 = <900000>;
> + opp-microvolt-speed2-pvs3-v0 = <900000>;
> + opp-microvolt-speed2-pvs4-v0 = <875000>;
> + opp-microvolt-speed2-pvs5-v0 = <875000>;
> + opp-microvolt-speed2-pvs6-v0 = <875000>;
> + opp-microvolt-speed14-pvs0-v0 = <950000>;
> + opp-microvolt-speed14-pvs1-v0 = <950000>;
> + opp-microvolt-speed14-pvs2-v0 = <925000>;
> + opp-microvolt-speed14-pvs3-v0 = <900000>;
> + opp-microvolt-speed14-pvs4-v0 = <875000>;
> + opp-microvolt-speed14-pvs5-v0 = <875000>;
> + opp-microvolt-speed14-pvs6-v0 = <875000>;
> + };
> +
> + opp-384000000 {
> + opp-hz = /bits/ 64 <384000000>;
> + opp-microvolt-speed0-pvs0-v0 = <950000>;
> + opp-microvolt-speed0-pvs1-v0 = <900000>;
> + opp-microvolt-speed0-pvs3-v0 = <850000>;
> + opp-microvolt-speed0-pvs3-v0 = <850000>;
> + opp-microvolt-speed1-pvs0-v0 = <950000>;
> + opp-microvolt-speed1-pvs1-v0 = <950000>;
> + opp-microvolt-speed1-pvs2-v0 = <925000>;
> + opp-microvolt-speed1-pvs3-v0 = <900000>;
> + opp-microvolt-speed1-pvs4-v0 = <875000>;
> + opp-microvolt-speed1-pvs5-v0 = <875000>;
> + opp-microvolt-speed1-pvs6-v0 = <875000>;
> + opp-microvolt-speed2-pvs0-v0 = <950000>;
> + opp-microvolt-speed2-pvs1-v0 = <925000>;
> + opp-microvolt-speed2-pvs2-v0 = <900000>;
> + opp-microvolt-speed2-pvs3-v0 = <900000>;
> + opp-microvolt-speed2-pvs4-v0 = <875000>;
> + opp-microvolt-speed2-pvs5-v0 = <875000>;
> + opp-microvolt-speed2-pvs6-v0 = <875000>;
> + opp-microvolt-speed14-pvs0-v0 = <950000>;
> + opp-microvolt-speed14-pvs1-v0 = <950000>;
> + opp-microvolt-speed14-pvs2-v0 = <925000>;
> + opp-microvolt-speed14-pvs3-v0 = <900000>;
> + opp-microvolt-speed14-pvs4-v0 = <875000>;
> + opp-microvolt-speed14-pvs5-v0 = <875000>;
> + opp-microvolt-speed14-pvs6-v0 = <875000>;
> + };
> +};
> +
> +EXAMPLE 2:
> +---------
> +/* For arch/arm/boot/dts/qcom-msm8974.dtsi--> format 'B' */
> +
> +qfprom: qfprom@...000 {
> + compatible = "qcom,qfprom";
> + reg = <0x00700000 0x1000>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> + pvs_efuse: pvs {
> + reg = <0xc0 0x8>;
> + };
> +};
> +
> +cpu_opp_table: opp-table {
> + compatible = "operating-points-v2-krait-cpu";
> + nvmem-cells = <&pvs_efuse>;
> +
> + /*
> + * Missing opp-shared property means CPUs switch DVFS states
> + * independently.
> + */
> + opp-960000000 {
> + opp-hz = /bits/ 64 <960000000>;
> + opp-microvolt-speed0-pvs0-v0 = <915000>;
> + opp-microvolt-speed0-pvs1-v0 = <895000>;
> + opp-microvolt-speed0-pvs2-v0 = <875000>;
> + opp-microvolt-speed0-pvs3-v0 = <860000>;
> + opp-microvolt-speed0-pvs4-v0 = <850000>;
> + opp-microvolt-speed0-pvs5-v0 = <840000>;
> + opp-microvolt-speed0-pvs6-v0 = <830000>;
> + opp-microvolt-speed2-pvs0-v0 = <875000>;
> + opp-microvolt-speed2-pvs1-v0 = <860000>;
> + opp-microvolt-speed2-pvs2-v0 = <845000>;
> + opp-microvolt-speed2-pvs3-v0 = <830000>;
> + opp-microvolt-speed2-pvs4-v0 = <820000>;
> + opp-microvolt-speed2-pvs5-v0 = <810000>;
> + opp-microvolt-speed2-pvs6-v0 = <800000>;
> + opp-microvolt-speed1-pvs0-v0 = <840000>;
> + opp-microvolt-speed1-pvs1-v0 = <825000>;
> + opp-microvolt-speed1-pvs2-v0 = <810000>;
> + opp-microvolt-speed1-pvs3-v0 = <795000>;
> + opp-microvolt-speed1-pvs4-v0 = <785000>;
> + opp-microvolt-speed1-pvs5-v0 = <775000>;
> + opp-microvolt-speed1-pvs6-v0 = <765000>;
> +
> + opp-microamp-speed0-pvs0-v0 = <252>;
> + opp-microamp-speed0-pvs1-v0 = <252>;
> + opp-microamp-speed0-pvs2-v0 = <252>;
> + opp-microamp-speed0-pvs3-v0 = <252>;
> + opp-microamp-speed0-pvs4-v0 = <252>;
> + opp-microamp-speed0-pvs5-v0 = <252>;
> + opp-microamp-speed0-pvs6-v0 = <252>;
> + opp-microamp-speed2-pvs0-v0 = <245>;
> + opp-microamp-speed2-pvs1-v0 = <245>;
> + opp-microamp-speed2-pvs2-v0 = <245>;
> + opp-microamp-speed2-pvs3-v0 = <245>;
> + opp-microamp-speed2-pvs4-v0 = <245>;
> + opp-microamp-speed2-pvs5-v0 = <245>;
> + opp-microamp-speed2-pvs6-v0 = <245>;
> + opp-microamp-speed1-pvs0-v0 = <242>;
> + opp-microamp-speed1-pvs1-v0 = <242>;
> + opp-microamp-speed1-pvs2-v0 = <242>;
> + opp-microamp-speed1-pvs3-v0 = <242>;
> + opp-microamp-speed1-pvs4-v0 = <242>;
> + opp-microamp-speed1-pvs5-v0 = <242>;
> + opp-microamp-speed1-pvs6-v0 = <242>;
> + };
> +
> + opp-883200000 {
> + opp-hz = /bits/ 64 <883200000>;
> + opp-microvolt-speed0-pvs0-v0 = <900000>;
> + opp-microvolt-speed0-pvs1-v0 = <885000>;
> + opp-microvolt-speed0-pvs2-v0 = <865000>;
> + opp-microvolt-speed0-pvs3-v0 = <850000>;
> + opp-microvolt-speed0-pvs4-v0 = <840000>;
> + opp-microvolt-speed0-pvs5-v0 = <830000>;
> + opp-microvolt-speed0-pvs6-v0 = <820000>;
> + opp-microvolt-speed2-pvs0-v0 = <865000>;
> + opp-microvolt-speed2-pvs1-v0 = <850000>;
> + opp-microvolt-speed2-pvs2-v0 = <835000>;
> + opp-microvolt-speed2-pvs3-v0 = <820000>;
> + opp-microvolt-speed2-pvs4-v0 = <810000>;
> + opp-microvolt-speed2-pvs5-v0 = <800000>;
> + opp-microvolt-speed2-pvs6-v0 = <790000>;
> + opp-microvolt-speed1-pvs0-v0 = <830000>;
> + opp-microvolt-speed1-pvs1-v0 = <815000>;
> + opp-microvolt-speed1-pvs2-v0 = <800000>;
> + opp-microvolt-speed1-pvs3-v0 = <785000>;
> + opp-microvolt-speed1-pvs4-v0 = <775000>;
> + opp-microvolt-speed1-pvs5-v0 = <765000>;
> + opp-microvolt-speed1-pvs6-v0 = <755000>;
> +
> + opp-microamp-speed0-pvs0-v0 = <229>;
> + opp-microamp-speed0-pvs1-v0 = <229>;
> + opp-microamp-speed0-pvs2-v0 = <229>;
> + opp-microamp-speed0-pvs3-v0 = <229>;
> + opp-microamp-speed0-pvs4-v0 = <229>;
> + opp-microamp-speed0-pvs5-v0 = <229>;
> + opp-microamp-speed0-pvs6-v0 = <229>;
> + opp-microamp-speed2-pvs0-v0 = <223>;
> + opp-microamp-speed2-pvs1-v0 = <223>;
> + opp-microamp-speed2-pvs2-v0 = <223>;
> + opp-microamp-speed2-pvs3-v0 = <223>;
> + opp-microamp-speed2-pvs4-v0 = <223>;
> + opp-microamp-speed2-pvs5-v0 = <223>;
> + opp-microamp-speed2-pvs6-v0 = <223>;
> + opp-microamp-speed1-pvs0-v0 = <221>;
> + opp-microamp-speed1-pvs1-v0 = <221>;
> + opp-microamp-speed1-pvs2-v0 = <221>;
> + opp-microamp-speed1-pvs3-v0 = <221>;
> + opp-microamp-speed1-pvs4-v0 = <221>;
> + opp-microamp-speed1-pvs5-v0 = <221>;
> + opp-microamp-speed1-pvs6-v0 = <221>;
> + };
> +};
> --
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