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>

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt
index 52b457c..f640308 100644 (file)
--- 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 {