linux-kernel - [PATCH v2 1/2] dt-bindings: devfreq: mediatek: Add mtk cci devfreq dt-bindings

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Date:   Fri, 8 Apr 2022 13:21:49 +0800
From:   Johnson Wang <johnson.wang@...iatek.com>
To:     <cw00.choi@...sung.com>, <krzk+dt@...nel.org>,
        <robh+dt@...nel.org>, <kyungmin.park@...sung.com>
CC:     <khilman@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <jia-wei.chang@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>
Subject: [PATCH v2 1/2] dt-bindings: devfreq: mediatek: Add mtk cci devfreq dt-bindings

Add devicetree binding of mtk cci devfreq on MediaTek SoC.

Signed-off-by: Johnson Wang <johnson.wang@...iatek.com>
Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>
---
 .../devicetree/bindings/devfreq/mtk-cci.yaml  | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/devfreq/mtk-cci.yaml

diff --git a/Documentation/devicetree/bindings/devfreq/mtk-cci.yaml b/Documentation/devicetree/bindings/devfreq/mtk-cci.yaml
new file mode 100644
index 000000000000..ef4ea951025c
--- /dev/null
+++ b/Documentation/devicetree/bindings/devfreq/mtk-cci.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/devfreq/mtk-cci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Cache Coherent Interconnect (CCI) frequency and voltage scaling
+
+maintainers:
+  - Jia-Wei Chang <jia-wei.chang@...iatek.com>
+
+description: |
+  MediaTek Cache Coherent Interconnect (CCI) uses the software devfreq module
+  to scale the clock frequency and adjust the voltage. MediaTek CCI shares
+  the same power supplies with CPU, so the scheduling involves with CPUfreq.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt8183-cci
+      - mediatek,mt8186-cci
+
+  clocks:
+    items:
+      - description:
+          The multiplexer for clock input of CPU cluster.
+      - description:
+          A parent of "cpu" clock which is used as an intermediate clock source
+          when the original CPU is under transition and not stable yet.
+
+  clock-names:
+    items:
+      - const: cci
+      - const: intermediate
+
+  operating-points-v2:
+    description:
+      For details, please refer to
+      Documentation/devicetree/bindings/opp/opp-v2.yaml
+
+  proc-supply:
+    description:
+      Phandle of the regulator for CCI that provides the supply voltage.
+
+  sram-supply:
+    description:
+      Phandle of the regulator for sram of CCI that provides the supply
+      voltage. When it presents, the cci devfreq driver needs to do
+      "voltage tracking" to step by step scale up/down Vproc and Vsram to fit
+      SoC specific needs. When absent, the voltage scaling flow is handled by
+      hardware, hence no software "voltage tracking" is needed.
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - operating-points-v2
+  - proc-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mt8183-clk.h>
+    cci: cci {
+      compatible = "mediatek,mt8183-cci";
+      clocks = <&mcucfg CLK_MCU_BUS_SEL>,
+               <&topckgen CLK_TOP_ARMPLL_DIV_PLL1>;
+      clock-names = "cci", "intermediate";
+      operating-points-v2 = <&cci_opp>;
+      proc-supply = <&mt6358_vproc12_reg>;
+    };
-- 
2.18.0