linux-kernel - [PATCH v6 1/3] dt-bindings: soc: add mtk svs dt-bindings

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Date:   Tue, 7 Jan 2020 15:01:52 +0800
From:   Roger Lu <roger.lu@...iatek.com>
To:     Kevin Hilman <khilman@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Nicolas Boichat <drinkcat@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>
CC:     Fan Chen <fan.chen@...iatek.com>,
        HenryC Chen <HenryC.Chen@...iatek.com>,
        YT Lee <yt.lee@...iatek.com>,
        Xiaoqing Liu <Xiaoqing.Liu@...iatek.com>,
        Charles Yang <Charles.Yang@...iatek.com>,
        Angus Lin <Angus.Lin@...iatek.com>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nishanth Menon <nm@...com>, Roger Lu <roger.lu@...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>
Subject: [PATCH v6 1/3] dt-bindings: soc: add mtk svs dt-bindings

Document the binding for enabling mtk svs on MediaTek SoC.

Signed-off-by: Roger Lu <roger.lu@...iatek.com>
---
 .../devicetree/bindings/power/mtk-svs.txt     | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/mtk-svs.txt

diff --git a/Documentation/devicetree/bindings/power/mtk-svs.txt b/Documentation/devicetree/bindings/power/mtk-svs.txt
new file mode 100644
index 000000000000..9a3e81b9e1d2
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/mtk-svs.txt
@@ -0,0 +1,76 @@
+* Mediatek Smart Voltage Scaling (MTK SVS)
+
+This describes the device tree binding for the MTK SVS controller (bank)
+which helps provide the optimized CPU/GPU/CCI voltages. This device also
+needs thermal data to calculate thermal slope for accurately compensate
+the voltages when temperature change.
+
+Required properties:
+- compatible:
+  - "mediatek,mt8183-svs" : For MT8183 family of SoCs
+- reg: Address range of the MTK SVS controller.
+- interrupts: IRQ for the MTK SVS controller.
+- clocks, clock-names: Clocks needed for the svs hardware. required
+                       clocks are:
+		       "main": Main clock for svs controller to work.
+- nvmem-cells: Phandle to the calibration data provided by a nvmem device.
+- nvmem-cell-names: Should be "svs-calibration-data" and "calibration-data"
+
+Subnodes:
+- svs-cpu-little: SVS bank device node of little CPU
+  compatible: "mediatek,mt8183-svs-cpu-little"
+  operating-points-v2: OPP table hooked by SVS little CPU bank.
+		       SVS will optimze this OPP table voltage part.
+  vcpu-little-supply: PMIC buck of little CPU
+- svs-cpu-big: SVS bank device node of big CPU
+  compatible: "mediatek,mt8183-svs-cpu-big"
+  operating-points-v2: OPP table hooked by SVS big CPU bank.
+		       SVS will optimze this OPP table voltage part.
+  vcpu-big-supply: PMIC buck of big CPU
+- svs-cci: SVS bank device node of CCI
+  compatible: "mediatek,mt8183-svs-cci"
+  operating-points-v2: OPP table hooked by SVS CCI bank.
+		       SVS will optimze this OPP table voltage part.
+  vcci-supply: PMIC buck of CCI
+- svs-gpu: SVS bank device node of GPU
+  compatible: "mediatek,mt8183-svs-gpu"
+  operating-points-v2: OPP table hooked by SVS GPU bank.
+		       SVS will optimze this OPP table voltage part.
+  vgpu-supply: PMIC buck of GPU
+
+Example:
+
+	svs: svs@...0b000 {
+		compatible = "mediatek,mt8183-svs";
+		reg = <0 0x1100b000 0 0x1000>;
+		interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&infracfg CLK_INFRA_THERM>;
+		clock-names = "main_clk";
+		nvmem-cells = <&svs_calibration>, <&thermal_calibration>;
+		nvmem-cell-names = "svs-calibration-data", "calibration-data";
+
+		svs_cpu_little: svs-cpu-little {
+			compatible = "mediatek,mt8183-svs-cpu-little";
+			operating-points-v2 = <&cluster0_opp>;
+			vcpu-little-supply = <&mt6358_vproc12_reg>;
+		};
+
+		svs_cpu_big: svs-cpu-big {
+			compatible = "mediatek,mt8183-svs-cpu-big";
+			operating-points-v2 = <&cluster1_opp>;
+			vcpu-big-supply = <&mt6358_vproc11_reg>;
+		};
+
+		svs_cci: svs-cci {
+			compatible = "mediatek,mt8183-svs-cci";
+			operating-points-v2 = <&cci_opp>;
+			vcci-supply = <&mt6358_vproc12_reg>;
+		};
+
+		svs_gpu: svs-gpu {
+			compatible = "mediatek,mt8183-svs-gpu";
+			power-domains = <&scpsys MT8183_POWER_DOMAIN_MFG_2D>;
+			operating-points-v2 = <&gpu_opp_table>;
+			vgpu-spply = <&mt6358_vgpu_reg>;
+		};
+	};
-- 
2.18.0