[PATCH v3 3/8] dt-bindings: opp: Describe H616 OPPs and opp-supported-hw

[Andre Przywara <andre.przywara@arm.com>]

From: Martin Botka <martin.botka@somainline.org>

Compared to the existing Allwinner H6 OPP scheme, the H616 uses a
similar NVMEM based mechanism to determine the silicon revision, which
is required to select the right frequency / voltage pair for the OPPs.
However it limits the maximum frequency for some speed bins, also seems
to not support all frequencies in all speed bins, which requires us to
introduce the opp-supported-hw property.

Add this property to the list of allowed properties, also drop the
requirement for the revision specific opp-microvolt properties, since
they might not be needed if using opp-supported-hw.

Also use to opportunity to adjust some wording, and drop a sentence
referring to the Linux driver and the OPP subsystem.

Shorten the existing example and add another example, showcasing the
opp-supported-hw property.

Signed-off-by: Martin Botka <martin.botka@somainline.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 .../allwinner,sun50i-h6-operating-points.yaml | 86 +++++++++----------
 1 file changed, 42 insertions(+), 44 deletions(-)

diff --git a/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml b/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml
index 51f62c3ae1947..d679b2e4a7199 100644
--- a/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml
+++ b/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml
@@ -13,25 +13,25 @@ maintainers:
 description: |
   For some SoCs, the CPU frequency subset and voltage value of each
   OPP varies based on the silicon variant in use. Allwinner Process
-  Voltage Scaling Tables defines the voltage and frequency value based
-  on the speedbin blown in the efuse combination. The
-  sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
-  provide the OPP framework with required information.
+  Voltage Scaling Tables define the voltage and frequency values based
+  on the speedbin blown in the efuse combination.
 
 allOf:
   - $ref: opp-v2-base.yaml#
 
 properties:
   compatible:
-    const: allwinner,sun50i-h6-operating-points
+    enum:
+      - allwinner,sun50i-h6-operating-points
+      - allwinner,sun50i-h616-operating-points
 
   nvmem-cells:
     description: |
       A phandle pointing to a nvmem-cells node representing the efuse
-      registers that has information about the speedbin that is used
+      register that has information about the speedbin that is used
       to select the right frequency/voltage value pair. Please refer
-      the for nvmem-cells bindings
-      Documentation/devicetree/bindings/nvmem/nvmem.txt and also
+      to the nvmem-cells bindings in
+      Documentation/devicetree/bindings/nvmem/nvmem.yaml and also the
       examples below.
 
   opp-shared: true
@@ -47,15 +47,17 @@ patternProperties:
     properties:
       opp-hz: true
       clock-latency-ns: true
+      opp-microvolt: true
+      opp-supported-hw:
+        description: |
+          A single 32 bit bitmap value, representing compatible HW, one
+          bit per speed bin index.
 
     patternProperties:
       "^opp-microvolt-speed[0-9]$": true
 
     required:
       - opp-hz
-      - opp-microvolt-speed0
-      - opp-microvolt-speed1
-      - opp-microvolt-speed2
 
     unevaluatedProperties: false
 
@@ -77,58 +79,54 @@ examples:
             opp-microvolt-speed2 = <800000>;
         };
 
-        opp-720000000 {
+        opp-1080000000 {
             clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <720000000>;
+            opp-hz = /bits/ 64 <1080000000>;
 
-            opp-microvolt-speed0 = <880000>;
-            opp-microvolt-speed1 = <820000>;
-            opp-microvolt-speed2 = <800000>;
+            opp-microvolt-speed0 = <1060000>;
+            opp-microvolt-speed1 = <880000>;
+            opp-microvolt-speed2 = <840000>;
         };
 
-        opp-816000000 {
+        opp-1488000000 {
             clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <816000000>;
+            opp-hz = /bits/ 64 <1488000000>;
 
-            opp-microvolt-speed0 = <880000>;
-            opp-microvolt-speed1 = <820000>;
-            opp-microvolt-speed2 = <800000>;
+            opp-microvolt-speed0 = <1160000>;
+            opp-microvolt-speed1 = <1000000>;
+            opp-microvolt-speed2 = <960000>;
         };
+    };
 
-        opp-888000000 {
-            clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <888000000>;
-
-            opp-microvolt-speed0 = <940000>;
-            opp-microvolt-speed1 = <820000>;
-            opp-microvolt-speed2 = <800000>;
-        };
+  - |
+    opp-table {
+        compatible = "allwinner,sun50i-h616-operating-points";
+        nvmem-cells = <&speedbin_efuse>;
+        opp-shared;
 
-        opp-1080000000 {
+        opp-480000000 {
             clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <1080000000>;
+            opp-hz = /bits/ 64 <480000000>;
 
-            opp-microvolt-speed0 = <1060000>;
-            opp-microvolt-speed1 = <880000>;
-            opp-microvolt-speed2 = <840000>;
+            opp-microvolt = <900000>;
+            opp-supported-hw = <0x1f>;
         };
 
-        opp-1320000000 {
+        opp-792000000 {
             clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <1320000000>;
+            opp-hz = /bits/ 64 <792000000>;
 
-            opp-microvolt-speed0 = <1160000>;
-            opp-microvolt-speed1 = <940000>;
-            opp-microvolt-speed2 = <900000>;
+            opp-microvolt-speed1 = <900000>;
+            opp-microvolt-speed4 = <940000>;
+            opp-supported-hw = <0x12>;
         };
 
-        opp-1488000000 {
+        opp-1512000000 {
             clock-latency-ns = <244144>; /* 8 32k periods */
-            opp-hz = /bits/ 64 <1488000000>;
+            opp-hz = /bits/ 64 <1512000000>;
 
-            opp-microvolt-speed0 = <1160000>;
-            opp-microvolt-speed1 = <1000000>;
-            opp-microvolt-speed2 = <960000>;
+            opp-microvolt = <1100000>;
+            opp-supported-hw = <0x0a>;
         };
     };
 
-- 
2.25.1