linux-kernel - [PATCH v5 3/7] dt-bindings: soc: mediatek: Add DVFSRC bindings for MT8183 and MT8195

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Message-ID: <20240424095416.1105639-4-angelogioacchino.delregno@collabora.com>
Date: Wed, 24 Apr 2024 11:54:12 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: djakov@...nel.org
Cc: robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	keescook@...omium.org,
	gustavoars@...nel.org,
	henryc.chen@...iatek.com,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	kernel@...labora.com,
	wenst@...omium.org,
	amergnat@...libre.com
Subject: [PATCH v5 3/7] dt-bindings: soc: mediatek: Add DVFSRC bindings for MT8183 and MT8195

Add bindings for the MediaTek Dynamic Voltage and Frequency Scaling
Resource Collector (DVFSRC), a hardware module used to collect all the
requests from both software and the various remote processors embedded
into the SoC and decide about a minimum operating voltage and a minimum
DRAM frequency to fulfill those requests in an effort to provide the
best achievable performance per watt.

This hardware IP is capable of transparently performing direct register
R/W on all of the DVFSRC-controlled regulators and SoC bandwidth knobs.

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../soc/mediatek/mediatek,mt8183-dvfsrc.yaml  | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8183-dvfsrc.yaml

diff --git a/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8183-dvfsrc.yaml b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8183-dvfsrc.yaml
new file mode 100644
index 000000000000..1ad5b61b249f
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mt8183-dvfsrc.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/mediatek/mediatek,mt8183-dvfsrc.yaml#
+$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
+  Hardware module used to collect all the requests from both software and the
+  various remote processors embedded into the SoC and decide about a minimum
+  operating voltage and a minimum DRAM frequency to fulfill those requests in
+  an effort to provide the best achievable performance per watt.
+  This hardware IP is capable of transparently performing direct register R/W
+  on all of the DVFSRC-controlled regulators and SoC bandwidth knobs.
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
+  - Henry Chen <henryc.chen@...iatek.com>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - mediatek,mt8183-dvfsrc
+          - mediatek,mt8195-dvfsrc
+      - items:
+          - const: mediatek,mt8192-dvfsrc
+          - const: mediatek,mt8195-dvfsrc
+
+  reg:
+    maxItems: 1
+    description: DVFSRC common register address and length.
+
+  regulators:
+    type: object
+    $ref: /schemas/regulator/mediatek,mt6873-dvfsrc-regulator.yaml#
+
+  interconnect:
+    type: object
+    $ref: /schemas/interconnect/mediatek,mt8183-emi.yaml#
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        system-controller@...12000 {
+            compatible = "mediatek,mt8195-dvfsrc";
+            reg = <0 0x10012000 0 0x1000>;
+
+            regulators {
+                compatible = "mediatek,mt8195-dvfsrc-regulator";
+
+                dvfsrc_vcore: dvfsrc-vcore {
+                        regulator-name = "dvfsrc-vcore";
+                        regulator-min-microvolt = <550000>;
+                        regulator-max-microvolt = <750000>;
+                        regulator-always-on;
+                };
+
+                dvfsrc_vscp: dvfsrc-vscp {
+                        regulator-name = "dvfsrc-vscp";
+                        regulator-min-microvolt = <550000>;
+                        regulator-max-microvolt = <750000>;
+                        regulator-always-on;
+                };
+            };
+
+            emi_icc: interconnect {
+                compatible = "mediatek,mt8195-emi";
+                #interconnect-cells = <1>;
+            };
+        };
+    };
-- 
2.44.0