From: Sean Wang <sean.wang@xxxxxxxxxxxx>
Update binding document to reflect the lastest driver logic and
add more examples guiding people how to use Mediatek cpufreq driver.
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
---
.../bindings/cpufreq/cpufreq-mediatek.txt | 170 ++++++++++++++++++++-
1 file changed, 167 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek.txt
index 52b457c..0703927 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: Pleaser 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 {
--
2.7.4
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