linux-kernel - [PATCH v5 2/4] dt-bindings: opp: opp-v2-kryo-cpu: Document named opp-microvolt property

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Message-ID: <20230930102218.229613-2-robimarko@gmail.com>
Date:   Sat, 30 Sep 2023 12:21:17 +0200
From:   Robert Marko <robimarko@...il.com>
To:     ilia.lin@...nel.org, vireshk@...nel.org, nm@...com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        rafael@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Christian Marangi <ansuelsmth@...il.com>,
        Robert Marko <robimarko@...il.com>
Subject: [PATCH v5 2/4] dt-bindings: opp: opp-v2-kryo-cpu: Document named opp-microvolt property

From: Christian Marangi <ansuelsmth@...il.com>

Document named opp-microvolt property for opp-v2-kryo-cpu schema.
This property is used to declare multiple voltage ranges selected on the
different values read from efuses. The selection is done based on the
speed pvs values and the named opp-microvolt property is selected by the
qcom-cpufreq-nvmem driver.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
Signed-off-by: Robert Marko <robimarko@...il.com>
---
Changes v5:
* Fix typo in opp items

Changes v4:
* Address comments from Rob (meaning of pvs, drop of
  driver specific info, drop of legacy single voltage OPP,
  better specify max regulators supported)

 .../bindings/opp/opp-v2-kryo-cpu.yaml         | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml b/Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml
index 27ea7eca73e5..8d2a47e9a854 100644
--- a/Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml
+++ b/Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml
@@ -65,6 +65,12 @@ patternProperties:
           5:  MSM8996SG, speedbin 1
           6:  MSM8996SG, speedbin 2
           7-31:  unused
+
+          Bitmap for IPQ806X SoC:
+          0:  IPQ8062
+          1:  IPQ8064/IPQ8066/IPQ8068
+          2:  IPQ8065/IPQ8069
+          3-31:  unused
         enum: [0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
                0x9, 0xd, 0xe, 0xf,
                0x10, 0x20, 0x30, 0x70]
@@ -73,6 +79,23 @@ patternProperties:
 
       required-opps: true
 
+    patternProperties:
+      '^opp-microvolt-speed[0-9]+-pvs[0-9]+$':
+        description: |
+          Named opp-microvolt property following the same generic
+          binding for named opp-microvolt.
+
+          The correct voltage range is selected based on the values
+          in the efuse for the speed and the pvs (power variable
+          scaling).
+        minItems: 1
+        maxItems: 4 # Up to 4 regulators: Core, Mem, Dig and HFPLL
+        items:
+          items:
+            - description: nominal voltage
+            - description: minimum voltage
+            - description: maximum voltage
+
     required:
       - opp-hz
 
@@ -258,6 +281,22 @@ examples:
             };
         };
 
+        /* Dummy opp table to give example for named opp-microvolt */
+        opp-table-2 {
+            compatible = "operating-points-v2-kryo-cpu";
+            nvmem-cells = <&speedbin_efuse>;
+
+            opp-384000000 {
+                opp-hz = /bits/ 64 <384000000>;
+                opp-microvolt-speed0-pvs0 = <1000000 950000 1050000>;
+                opp-microvolt-speed0-pvs1 = <925000 878750 971250>;
+                opp-microvolt-speed0-pvs2 = <875000 831250 918750>;
+                opp-microvolt-speed0-pvs3 = <800000 760000 840000>;
+                opp-supported-hw = <0x7>;
+                clock-latency-ns = <100000>;
+            };
+        };
+
         smem {
             compatible = "qcom,smem";
             memory-region = <&smem_mem>;
-- 
2.41.0