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author | Sean Wang <sean.wang@mediatek.com> | 2017-07-18 14:01:45 +0800 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-22 02:19:38 +0200 |
commit | bb33270c02a9bb32d81a8dc83f8f2f3aea796404 (patch) | |
tree | 1b05fe8cfb05131d6147d5b9e84fbbc70bbe12ae /Documentation | |
parent | 7e17ae8657fc83e9b0357af5d1cb7d0e3130537b (diff) | |
download | linux-stable-bb33270c02a9bb32d81a8dc83f8f2f3aea796404.tar.gz linux-stable-bb33270c02a9bb32d81a8dc83f8f2f3aea796404.tar.bz2 linux-stable-bb33270c02a9bb32d81a8dc83f8f2f3aea796404.zip |
dt-bindings: cpufreq: enhance MediaTek cpufreq dt-binding document
Update binding document with adding operating-points-v2 as the required
property and the cooling level as the optional properties and adding more
examples guiding people how to use MediaTek cpufreq driver for MediaTek
SoCs.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt | 170 |
1 files changed, 167 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt index 52b457c23eed..f6403089edcf 100644 --- a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt @@ -1,4 +1,5 @@ -Device Tree Clock bindins for CPU DVFS of Mediatek MT8173 SoC +Binding for MediaTek's CPUFreq driver +===================================== Required properties: - clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock names. @@ -9,6 +10,8 @@ Required properties: transition and not stable yet. Please refer to Documentation/devicetree/bindings/clk/clock-bindings.txt for generic clock consumer properties. +- operating-points-v2: Please refer to Documentation/devicetree/bindings/opp/opp.txt + for detail. - proc-supply: Regulator for Vproc of CPU cluster. Optional properties: @@ -17,9 +20,166 @@ Optional properties: Vsram to fit SoC specific needs. When absent, the voltage scaling flow is handled by hardware, hence no software "voltage tracking" is needed. +- #cooling-cells: +- cooling-min-level: +- cooling-max-level: + Please refer to Documentation/devicetree/bindings/thermal/thermal.txt + for detail. + +Example 1 (MT7623 SoC): + + cpu_opp_table: opp_table { + compatible = "operating-points-v2"; + opp-shared; + + opp-598000000 { + opp-hz = /bits/ 64 <598000000>; + opp-microvolt = <1050000>; + }; + + opp-747500000 { + opp-hz = /bits/ 64 <747500000>; + opp-microvolt = <1050000>; + }; + + opp-1040000000 { + opp-hz = /bits/ 64 <1040000000>; + opp-microvolt = <1150000>; + }; + + opp-1196000000 { + opp-hz = /bits/ 64 <1196000000>; + opp-microvolt = <1200000>; + }; + + opp-1300000000 { + opp-hz = /bits/ 64 <1300000000>; + opp-microvolt = <1300000>; + }; + }; + + cpu0: cpu@0 { + device_type = "cpu"; + compatible = "arm,cortex-a7"; + reg = <0x0>; + clocks = <&infracfg CLK_INFRA_CPUSEL>, + <&apmixedsys CLK_APMIXED_MAINPLL>; + clock-names = "cpu", "intermediate"; + operating-points-v2 = <&cpu_opp_table>; + #cooling-cells = <2>; + cooling-min-level = <0>; + cooling-max-level = <7>; + }; + cpu@1 { + device_type = "cpu"; + compatible = "arm,cortex-a7"; + reg = <0x1>; + operating-points-v2 = <&cpu_opp_table>; + }; + cpu@2 { + device_type = "cpu"; + compatible = "arm,cortex-a7"; + reg = <0x2>; + operating-points-v2 = <&cpu_opp_table>; + }; + cpu@3 { + device_type = "cpu"; + compatible = "arm,cortex-a7"; + reg = <0x3>; + operating-points-v2 = <&cpu_opp_table>; + }; + +Example 2 (MT8173 SoC): + cpu_opp_table_a: opp_table_a { + compatible = "operating-points-v2"; + opp-shared; + + opp-507000000 { + opp-hz = /bits/ 64 <507000000>; + opp-microvolt = <859000>; + }; + + opp-702000000 { + opp-hz = /bits/ 64 <702000000>; + opp-microvolt = <908000>; + }; + + opp-1001000000 { + opp-hz = /bits/ 64 <1001000000>; + opp-microvolt = <983000>; + }; + + opp-1105000000 { + opp-hz = /bits/ 64 <1105000000>; + opp-microvolt = <1009000>; + }; + + opp-1183000000 { + opp-hz = /bits/ 64 <1183000000>; + opp-microvolt = <1028000>; + }; + + opp-1404000000 { + opp-hz = /bits/ 64 <1404000000>; + opp-microvolt = <1083000>; + }; + + opp-1508000000 { + opp-hz = /bits/ 64 <1508000000>; + opp-microvolt = <1109000>; + }; + + opp-1573000000 { + opp-hz = /bits/ 64 <1573000000>; + opp-microvolt = <1125000>; + }; + }; + + cpu_opp_table_b: opp_table_b { + compatible = "operating-points-v2"; + opp-shared; + + opp-507000000 { + opp-hz = /bits/ 64 <507000000>; + opp-microvolt = <828000>; + }; + + opp-702000000 { + opp-hz = /bits/ 64 <702000000>; + opp-microvolt = <867000>; + }; + + opp-1001000000 { + opp-hz = /bits/ 64 <1001000000>; + opp-microvolt = <927000>; + }; + + opp-1209000000 { + opp-hz = /bits/ 64 <1209000000>; + opp-microvolt = <968000>; + }; + + opp-1404000000 { + opp-hz = /bits/ 64 <1007000000>; + opp-microvolt = <1028000>; + }; + + opp-1612000000 { + opp-hz = /bits/ 64 <1612000000>; + opp-microvolt = <1049000>; + }; + + opp-1807000000 { + opp-hz = /bits/ 64 <1807000000>; + opp-microvolt = <1089000>; + }; + + opp-1989000000 { + opp-hz = /bits/ 64 <1989000000>; + opp-microvolt = <1125000>; + }; + }; -Example: --------- cpu0: cpu@0 { device_type = "cpu"; compatible = "arm,cortex-a53"; @@ -29,6 +189,7 @@ Example: clocks = <&infracfg CLK_INFRA_CA53SEL>, <&apmixedsys CLK_APMIXED_MAINPLL>; clock-names = "cpu", "intermediate"; + operating-points-v2 = <&cpu_opp_table_a>; }; cpu1: cpu@1 { @@ -40,6 +201,7 @@ Example: clocks = <&infracfg CLK_INFRA_CA53SEL>, <&apmixedsys CLK_APMIXED_MAINPLL>; clock-names = "cpu", "intermediate"; + operating-points-v2 = <&cpu_opp_table_a>; }; cpu2: cpu@100 { @@ -51,6 +213,7 @@ Example: clocks = <&infracfg CLK_INFRA_CA57SEL>, <&apmixedsys CLK_APMIXED_MAINPLL>; clock-names = "cpu", "intermediate"; + operating-points-v2 = <&cpu_opp_table_b>; }; cpu3: cpu@101 { @@ -62,6 +225,7 @@ Example: clocks = <&infracfg CLK_INFRA_CA57SEL>, <&apmixedsys CLK_APMIXED_MAINPLL>; clock-names = "cpu", "intermediate"; + operating-points-v2 = <&cpu_opp_table_b>; }; &cpu0 { |