linux-kernel - Re: [PATCH RFC 1/3] dt-bindings: soc: sophgo: add TOP syscon for CV18XX/SG200X series SoC

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Message-ID: <20250612-culpable-roman-295df1360198@spud>
Date: Thu, 12 Jun 2025 17:04:46 +0100
From: Conor Dooley <conor@...nel.org>
To: Inochi Amaoto <inochiama@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Yu Yuan <yu.yuan@...u.edu.cn>, Yixun Lan <dlan@...too.org>,
	Ze Huang <huangze@...t.edu.cn>,
	Thomas Bonnefille <thomas.bonnefille@...tlin.com>,
	devicetree@...r.kernel.org, sophgo@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH RFC 1/3] dt-bindings: soc: sophgo: add TOP syscon for
 CV18XX/SG200X series SoC

On Wed, Jun 11, 2025 at 04:24:49PM +0800, Inochi Amaoto wrote:
> The Sophgo CV1800/SG2000 SoC top misc system controller provides register
> access to configure related modules. It includes a usb2 phy and a dma
> multiplexer.
> 
> Signed-off-by: Inochi Amaoto <inochiama@...il.com>
> ---
>  .../soc/sophgo/sophgo,cv1800b-top-syscon.yaml | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml
> new file mode 100644
> index 000000000000..e8093a558c4e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/sophgo/sophgo,cv1800b-top-syscon.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV18XX/SG200X SoC top system controller
> +
> +maintainers:
> +  - Inochi Amaoto <inochiama@...look.com>
> +
> +description:
> +  The Sophgo CV18XX/SG200X SoC top misc system controller provides
> +  register access to configure related modules.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - const: sophgo,cv1800b-top-syscon
> +          - const: syscon
> +          - const: simple-mfd
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1
> +
> +patternProperties:
> +  "dma-router@[0-9a-f]+$":
> +    $ref: /schemas/dma/sophgo,cv1800b-dmamux.yaml#

I think you're supposed to add "unevaluatedProperties: false" to each of
these nodes.

> +
> +  "phy@[0-9a-f]+$":
> +    $ref: /schemas/phy/sophgo,cv1800b-usb2-phy.yaml#

Why are these permitting random addresses? Are they not at fixed
addreses given that you only support one platform (modulo the rebrand)?

> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    syscon@...0000 {
> +      compatible = "sophgo,cv1800b-top-syscon", "syscon", "simple-mfd";
> +      reg = <0x03000000 0x1000>;
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +    };
> +
> +...
> -- 
> 2.49.0
> 

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