[PATCH v6 1/2] dt-bindings: cpufreq: Document support for Airoha EN7581 CPUFreq

[Christian Marangi]

Document required property for Airoha EN7581 CPUFreq .

On newer Airoha SoC, CPU Frequency is scaled indirectly with SMCCC commands
to ATF and no clocks are exposed to the OS.

The SoC have performance state described by ID for each OPP, for this a
Power Domain is used that sets the performance state ID according to the
required OPPs defined in the CPU OPP tables.

Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
Changes v6:
- No changes
Changes v5:
- Add Reviewed-by tag
- Fix OPP node name error
- Rename cpufreq node name to power-domain
- Rename CPU node power domain name to perf
- Add model and compatible to example
Changes v4:
- Add this patch

 .../cpufreq/airoha,en7581-cpufreq.yaml        | 262 ++++++++++++++++++
 1 file changed, 262 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml

diff --git a/Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml b/Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml
new file mode 100644
index 000000000000..7e36fa037e4b
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml
@@ -0,0 +1,262 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/airoha,en7581-cpufreq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Airoha EN7581 CPUFreq
+
+maintainers:
+  - Christian Marangi <ansuelsmth@xxxxxxxxx>
+
+description: |
+  On newer Airoha SoC, CPU Frequency is scaled indirectly with SMCCC commands
+  to ATF and no clocks are exposed to the OS.
+
+  The SoC have performance state described by ID for each OPP, for this a
+  Power Domain is used that sets the performance state ID according to the
+  required OPPs defined in the CPU OPP tables.
+
+properties:
+  compatible:
+    const: airoha,en7581-cpufreq
+
+  '#clock-cells':
+    const: 0
+
+  '#power-domain-cells':
+    const: 0
+
+  operating-points-v2: true
+
+required:
+  - compatible
+  - '#clock-cells'
+  - '#power-domain-cells'
+  - operating-points-v2
+
+additionalProperties: false
+
+examples:
+  - |
+    / {
+        model = "Airoha EN7581 Evaluation Board";
+        compatible = "airoha,en7581-evb", "airoha,en7581";
+
+        #address-cells = <2>;
+      	#size-cells = <2>;
+
+        cpus {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            cpu0: cpu@0 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a53";
+                reg = <0x0>;
+                operating-points-v2 = <&cpu_opp_table>;
+                enable-method = "psci";
+                clocks = <&cpu_pd>;
+                clock-names = "cpu";
+                power-domains = <&cpu_pd>;
+                power-domain-names = "perf";
+                next-level-cache = <&l2>;
+                #cooling-cells = <2>;
+            };
+
+            cpu1: cpu@1 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a53";
+                reg = <0x1>;
+                operating-points-v2 = <&cpu_opp_table>;
+                enable-method = "psci";
+                clocks = <&cpu_pd>;
+                clock-names = "cpu";
+                power-domains = <&cpu_pd>;
+                power-domain-names = "perf";
+                next-level-cache = <&l2>;
+                #cooling-cells = <2>;
+            };
+
+            cpu2: cpu@2 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a53";
+                reg = <0x2>;
+                operating-points-v2 = <&cpu_opp_table>;
+                enable-method = "psci";
+                clocks = <&cpu_pd>;
+                clock-names = "cpu";
+                power-domains = <&cpu_pd>;
+                power-domain-names = "perf";
+                next-level-cache = <&l2>;
+                #cooling-cells = <2>;
+            };
+
+            cpu3: cpu@3 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a53";
+                reg = <0x3>;
+                operating-points-v2 = <&cpu_opp_table>;
+                enable-method = "psci";
+                clocks = <&cpu_pd>;
+                clock-names = "cpu";
+                power-domains = <&cpu_pd>;
+                power-domain-names = "perf";
+                next-level-cache = <&l2>;
+                #cooling-cells = <2>;
+            };
+        };
+
+        cpu_opp_table: opp-table-cpu {
+            compatible = "operating-points-v2";
+            opp-shared;
+
+            opp-500000000 {
+                opp-hz = /bits/ 64 <500000000>;
+                required-opps = <&smcc_opp0>;
+            };
+
+            opp-550000000 {
+                opp-hz = /bits/ 64 <550000000>;
+                required-opps = <&smcc_opp1>;
+            };
+
+            opp-600000000 {
+                opp-hz = /bits/ 64 <600000000>;
+                required-opps = <&smcc_opp2>;
+            };
+
+            opp-650000000 {
+                opp-hz = /bits/ 64 <650000000>;
+                required-opps = <&smcc_opp3>;
+            };
+
+            opp-7000000000 {
+                opp-hz = /bits/ 64 <700000000>;
+                required-opps = <&smcc_opp4>;
+            };
+
+            opp-7500000000 {
+                opp-hz = /bits/ 64 <750000000>;
+                required-opps = <&smcc_opp5>;
+            };
+
+            opp-8000000000 {
+                opp-hz = /bits/ 64 <800000000>;
+                required-opps = <&smcc_opp6>;
+            };
+
+            opp-8500000000 {
+                opp-hz = /bits/ 64 <850000000>;
+                required-opps = <&smcc_opp7>;
+            };
+
+            opp-9000000000 {
+                opp-hz = /bits/ 64 <900000000>;
+                required-opps = <&smcc_opp8>;
+            };
+
+            opp-9500000000 {
+                opp-hz = /bits/ 64 <950000000>;
+                required-opps = <&smcc_opp9>;
+            };
+
+            opp-10000000000 {
+                opp-hz = /bits/ 64 <1000000000>;
+                required-opps = <&smcc_opp10>;
+            };
+
+            opp-10500000000 {
+                opp-hz = /bits/ 64 <1050000000>;
+                required-opps = <&smcc_opp11>;
+            };
+
+            opp-11000000000 {
+                opp-hz = /bits/ 64 <1100000000>;
+                required-opps = <&smcc_opp12>;
+            };
+
+            opp-11500000000 {
+                opp-hz = /bits/ 64 <1150000000>;
+                required-opps = <&smcc_opp13>;
+            };
+
+            opp-12000000000 {
+                opp-hz = /bits/ 64 <1200000000>;
+                required-opps = <&smcc_opp14>;
+            };
+        };
+
+        cpu_smcc_opp_table: opp-table-smcc {
+            compatible = "operating-points-v2";
+
+            smcc_opp0: opp-0 {
+               opp-level = <0>;
+            };
+
+            smcc_opp1: opp-1 {
+                opp-level = <1>;
+            };
+
+            smcc_opp2: opp-2 {
+               opp-level = <2>;
+            };
+
+            smcc_opp3: opp-3 {
+               opp-level = <3>;
+            };
+
+            smcc_opp4: opp-4 {
+                opp-level = <4>;
+            };
+
+            smcc_opp5: opp-5 {
+                opp-level = <5>;
+            };
+
+            smcc_opp6: opp-6 {
+               opp-level = <6>;
+            };
+
+            smcc_opp7: opp-7 {
+               opp-level = <7>;
+            };
+
+            smcc_opp8: opp-8 {
+                opp-level = <8>;
+            };
+
+            smcc_opp9: opp-9 {
+               opp-level = <9>;
+            };
+
+            smcc_opp10: opp-10 {
+                opp-level = <10>;
+            };
+
+            smcc_opp11: opp-11 {
+                opp-level = <11>;
+            };
+
+            smcc_opp12: opp-12 {
+                opp-level = <12>;
+            };
+
+            smcc_opp13: opp-13 {
+                opp-level = <13>;
+            };
+
+            smcc_opp14: opp-14 {
+                opp-level = <14>;
+            };
+        };
+
+        cpu_pd: power-domain {
+            compatible = "airoha,en7581-cpufreq";
+
+            operating-points-v2 = <&cpu_smcc_opp_table>;
+
+            #power-domain-cells = <0>;
+            #clock-cells = <0>;
+        };
+    };
-- 
2.45.2