linux-kernel - [PATCH v2 1/3] dt-bindings: power: Add Allwinner D1 PPU

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Message-Id: <20230126063419.15971-2-samuel@sholland.org>
Date:   Thu, 26 Jan 2023 00:34:17 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Samuel Holland <samuel@...lland.org>,
        Andre Przywara <andre.przywara@....com>,
        Conor Dooley <conor@...nel.org>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 1/3] dt-bindings: power: Add Allwinner D1 PPU

The Allwinner D1 family of SoCs contain a PPU power domain controller
separate from the PRCM. It can power down the video engine and DSP, and
it contains special logic for hardware-assisted CPU idle. Other recent
Allwinner SoCs (e.g. TV303) have a PPU with a different set of domains.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---

Changes in v2:
 - Removed quotes from "PPU"
 - Fixed indentation in binding example

 .../power/allwinner,sun20i-d1-ppu.yaml        | 54 +++++++++++++++++++
 .../power/allwinner,sun20i-d1-ppu.h           | 10 ++++
 2 files changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
 create mode 100644 include/dt-bindings/power/allwinner,sun20i-d1-ppu.h

diff --git a/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml b/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
new file mode 100644
index 000000000000..46e2647a5d72
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/allwinner,sun20i-d1-ppu.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/allwinner,sun20i-d1-ppu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner SoCs PPU power domain controller
+
+maintainers:
+  - Samuel Holland <samuel@...lland.org>
+
+description:
+  D1 and related SoCs contain a power domain controller for the CPUs, GPU, and
+  video-related hardware.
+
+properties:
+  compatible:
+    enum:
+      - allwinner,sun20i-d1-ppu
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: Bus Clock
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  '#power-domain-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+  - '#power-domain-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/sun20i-d1-r-ccu.h>
+    #include <dt-bindings/reset/sun20i-d1-r-ccu.h>
+
+    ppu: power-controller@...1000 {
+        compatible = "allwinner,sun20i-d1-ppu";
+        reg = <0x7001000 0x1000>;
+        clocks = <&r_ccu CLK_BUS_R_PPU>;
+        resets = <&r_ccu RST_BUS_R_PPU>;
+        #power-domain-cells = <1>;
+    };
diff --git a/include/dt-bindings/power/allwinner,sun20i-d1-ppu.h b/include/dt-bindings/power/allwinner,sun20i-d1-ppu.h
new file mode 100644
index 000000000000..23cfb57256d6
--- /dev/null
+++ b/include/dt-bindings/power/allwinner,sun20i-d1-ppu.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_POWER_SUN20I_D1_PPU_H_
+#define _DT_BINDINGS_POWER_SUN20I_D1_PPU_H_
+
+#define PD_CPU			0
+#define PD_VE			1
+#define PD_DSP			2
+
+#endif /* _DT_BINDINGS_POWER_SUN20I_D1_PPU_H_ */
-- 
2.37.4