linux-kernel - [PATCH v4 2/2] dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW

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Message-ID: <1599550547-27767-3-git-send-email-hector.yuan@mediatek.com>
Date:   Tue, 8 Sep 2020 15:35:47 +0800
From:   Hector Yuan <hector.yuan@...iatek.com>
To:     <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <wsd_upstream@...iatek.com>,
        <hector.yuan@...iatek.com>
Subject: [PATCH v4 2/2] dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW

From: "Hector.Yuan" <hector.yuan@...iatek.com>

Add devicetree bindings for MediaTek HW driver.

Signed-off-by: Hector.Yuan <hector.yuan@...iatek.com>
---
 .../bindings/cpufreq/cpufreq-mediatek-hw.yaml      |  141 ++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml

diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
new file mode 100644
index 0000000..5be5867
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/cpufreq-mediatek-hw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek's CPUFREQ Bindings
+
+maintainers:
+  - Hector Yuan <hector.yuan@...iatek.com>
+
+description:
+  CPUFREQ HW is a hardware engine used by MediaTek
+  SoCs to manage frequency in hardware. It is capable of controlling frequency
+  for multiple clusters.
+
+properties:
+  compatible:
+    const: mediatek,cpufreq-hw
+
+  reg:
+    minItems: 1
+    maxItems: 2
+    description: |
+      Addresses and sizes for the memory of the HW bases in each frequency domain.
+
+  reg-names:
+    items:
+      - const: "freq-domain0"
+      - const: "freq-domain1"
+    description: |
+      Frequency domain name. i.e.
+      "freq-domain0", "freq-domain1".
+
+  "#freq-domain-cells":
+    const: 1
+    description: |
+      Number of cells in a freqency domain specifier.
+
+  mtk-freq-domain:
+    maxItems: 1
+    description: |
+      Define this cpu belongs to which frequency domain. i.e.
+      cpu0-3 belong to frequency domain0,
+      cpu4-6 belong to frequency domain1.
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - "#freq-domain-cells"
+
+examples:
+  - |
+    cpus {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            cpu0: cpu@0 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 0>;
+                reg = <0x000>;
+            };
+
+            cpu1: cpu@1 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 0>;
+                reg = <0x100>;
+            };
+
+            cpu2: cpu@2 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 0>;
+                reg = <0x200>;
+            };
+
+            cpu3: cpu@3 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 0>;
+                reg = <0x300>;
+            };
+
+            cpu4: cpu@4 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 1>;
+                reg = <0x400>;
+            };
+
+            cpu5: cpu@5 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a55";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 1>;
+                reg = <0x500>;
+            };
+
+            cpu6: cpu@6 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a75";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 1>;
+                reg = <0x600>;
+            };
+
+            cpu7: cpu@7 {
+                device_type = "cpu";
+                compatible = "arm,cortex-a75";
+                enable-method = "psci";
+                mtk-freq-domain = <&cpufreq_hw 1>;
+                reg = <0x700>;
+            };
+    };
+
+    /* ... */
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        cpufreq_hw: cpufreq@...c00 {
+            compatible = "mediatek,cpufreq-hw";
+            reg = <0 0x11bc10 0 0x8c>,
+               <0 0x11bca0 0 0x8c>;
+            reg-names = "freq-domain0", "freq-domain1";
+            #freq-domain-cells = <1>;
+        };
+    };
+
+
+
+
-- 
1.7.9.5