[PATCH v4 1/3] dt-bindings: cpufreq: qcom-cpufreq-nvmem: make cpr bindings optional

[Christian Marangi <ansuelsmth@gmail.com>]

The qcom-cpufreq-nvmem driver supports 2 kind of devices:
- pre-cpr that doesn't have power-domains and base everything on nvmem
  cells and multiple named microvolt bindings.
  Doesn't need required-opp binding in the opp nodes as they are only
  used for genpd based devices.
- cpr-based that require power-domain in the cpu nodes and use various
  source to decide the correct voltage and freq
  Require required-opp binding since they need to be linked to the
  related opp-level.

When the schema was introduced, it was wrongly set to always require these
binding but this is not the case for pre-cpr devices.

Make the power-domain and the required-opp optional and set them required
only for qcs404 based devices.

Fixes: ec24d1d55469 ("dt-bindings: opp: Convert qcom-nvmem-cpufreq to DT schema")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
Changes v4:
- Explain why required-opp needs to be conditional
- Split additional ref part
Changesv3:
- No change
Changes v2:
- Reword commit description
- Fix condition order
- Add allOf

 .../bindings/cpufreq/qcom-cpufreq-nvmem.yaml  | 62 +++++++++++--------
 1 file changed, 37 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml b/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
index 9c086eac6ca7..89e99a198281 100644
--- a/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
+++ b/Documentation/devicetree/bindings/cpufreq/qcom-cpufreq-nvmem.yaml
@@ -17,6 +17,9 @@ description: |
   on the CPU OPP in use. The CPUFreq driver sets the CPR power domain level
   according to the required OPPs defined in the CPU OPP tables.
 
+  For old implementation efuses are parsed to select the correct opp table and
+  voltage and CPR is not supported/used.
+
 select:
   properties:
     compatible:
@@ -33,37 +36,46 @@ select:
   required:
     - compatible
 
-properties:
-  cpus:
-    type: object
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,qcs404
 
-    patternProperties:
-      '^cpu@[0-9a-f]+$':
-        type: object
+    then:
+      properties:
+        cpus:
+          type: object
 
-        properties:
-          power-domains:
-            maxItems: 1
+          patternProperties:
+            '^cpu@[0-9a-f]+$':
+              type: object
 
-          power-domain-names:
-            items:
-              - const: cpr
+              properties:
+                power-domains:
+                  maxItems: 1
 
-        required:
-          - power-domains
-          - power-domain-names
+                power-domain-names:
+                  items:
+                    - const: cpr
+
+              required:
+                - power-domains
+                - power-domain-names
 
-patternProperties:
-  '^opp-table(-[a-z0-9]+)?$':
-    if:
-      properties:
-        compatible:
-          const: operating-points-v2-kryo-cpu
-    then:
       patternProperties:
-        '^opp-?[0-9]+$':
-          required:
-            - required-opps
+        '^opp-table(-[a-z0-9]+)?$':
+          if:
+            properties:
+              compatible:
+                const: operating-points-v2-kryo-cpu
+          then:
+            patternProperties:
+              '^opp-?[0-9]+$':
+                required:
+                  - required-opps
 
 additionalProperties: true
 
-- 
2.38.1