linux-kernel - [PATCH V7 01/13] dt-bindings: soc: Add dvfsrc driver bindings

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Message-ID: <1610092095-5113-2-git-send-email-henryc.chen@mediatek.com>
Date:   Fri, 8 Jan 2021 15:48:03 +0800
From:   Henry Chen <henryc.chen@...iatek.com>
To:     Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Ryan Case <ryandcase@...omium.org>,
        Mark Brown <broonie@...nel.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Nicolas Boichat <drinkcat@...gle.com>,
        Fan Chen <fan.chen@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Arvin Wang <arvin.wang@...iatek.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        Henry Chen <henryc.chen@...iatek.com>
Subject: [PATCH V7 01/13] dt-bindings: soc: Add dvfsrc driver bindings

Document the binding for enabling dvfsrc on MediaTek SoC.

Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
---
 .../devicetree/bindings/soc/mediatek/dvfsrc.yaml   | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/mediatek/dvfsrc.yaml

diff --git a/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.yaml b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.yaml
new file mode 100644
index 0000000..0b746a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/soc/mediatek/dvfsrc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: MediaTek dynamic voltage and frequency scaling resource collector (DVFSRC)
+
+description: |
+  The Dynamic Voltage and Frequency Scaling Resource Collector (DVFSRC) is a
+  HW module which is used to collect all the requests from both software and
+  hardware and turn into the decision of minimum operating voltage and minimum
+  DRAM frequency to fulfill those requests.
+
+maintainers:
+  - henryc.chen <henryc.chen@...iatek.com>
+
+properties:
+  reg:
+    description: DVFSRC common register address and length.
+
+  compatible:
+    enum:
+      - mediatek,mt6873-dvfsrc
+      - mediatek,mt8183-dvfsrc
+      - mediatek,mt8192-dvfsrc
+
+  '#interconnect-cells':
+    const: 1
+
+patternProperties:
+  dvfsrc-vcore:
+    type: object
+    description:
+      The DVFSRC regulator is modelled as a subdevice of the DVFSRC.
+      Because DVFSRC can request power directly via register read/write, likes
+      vcore which is a core power of mt8183. As such, the DVFSRC regulator
+      requires that DVFSRC nodes be present.
+    $ref: /schemas/regulator/regulator.yaml#
+
+required:
+  - compatible
+  - reg
+  - "#interconnect-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interconnect/mtk,mt8183-emi.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        dvfsrc@...12000 {
+            compatible = "mediatek,mt8183-dvfsrc";
+            reg = <0 0x10012000 0 0x1000>;
+            #interconnect-cells = <1>;
+            dvfsrc_vcore: dvfsrc-vcore {
+                    regulator-name = "dvfsrc-vcore";
+                    regulator-min-microvolt = <725000>;
+                    regulator-max-microvolt = <800000>;
+                    regulator-always-on;
+            };
+        };
+    };
-- 
1.9.1