linux-kernel - Re: [PATCH v4 1/3] dt-bindings: soc: sophgo: add TOP syscon for CV18XX/SG200X series SoC

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Message-ID: <20251024-universe-undertake-8ff51d27d2cb@spud>
Date: Fri, 24 Oct 2025 17:47:48 +0100
From: Conor Dooley <conor@...nel.org>
To: Longbin Li <looong.bin@...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>,
	Inochi Amaoto <inochiama@...il.com>, Paul Walmsley <pjw@...nel.org>,
	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>, Ze Huang <huangze@...t.edu.cn>,
	devicetree@...r.kernel.org, sophgo@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] dt-bindings: soc: sophgo: add TOP syscon for
 CV18XX/SG200X series SoC

On Fri, Oct 24, 2025 at 05:46:03PM +0100, Conor Dooley wrote:
> On Fri, Oct 24, 2025 at 11:05:14AM +0800, Longbin Li wrote:
> > The Sophgo CV1800/SG2000 SoC top misc system controller provides register
> 
> Please remind me how it works, sg2000 is just a rebadge and really this
> just refers to one device?
> 
> > access to configure related modules. It includes a usb2 phy and a dma
> > multiplexer.
> > 
> > Co-developed-by: Inochi Amaoto <inochiama@...il.com>
> > Signed-off-by: Inochi Amaoto <inochiama@...il.com>
> > Signed-off-by: Longbin Li <looong.bin@...il.com>
> > ---
> >  .../soc/sophgo/sophgo,cv1800b-top-syscon.yaml | 81 +++++++++++++++++++
> >  1 file changed, 81 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..d044ca661fa2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-top-syscon.yaml
> > @@ -0,0 +1,81 @@
> > +# 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.
> 
> Here and in the title you have Xs, are those placeholder or is this
> going into cv180x.dtsi and going to be used on multiple devices?

nvm, I read the next patch. It's going into cv180x.dtsi.

> > +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
> > +
> > +  ranges: true
> 
> Do you actually use ranges?
> 
> > +patternProperties:
> > +  "dma-router@[0-9a-f]+$":
> 
> Do these actually appear at variable addresses, or is it always 48 for
> the phy and 53 for the dma router?
> 
> > +    $ref: /schemas/dma/sophgo,cv1800b-dmamux.yaml#
> > +    unevaluatedProperties: false
> > +
> > +  "phy@[0-9a-f]+$":
> > +    $ref: /schemas/phy/sophgo,cv1800b-usb2-phy.yaml#
> > +    unevaluatedProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - "#address-cells"
> > +  - "#size-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/sophgo,cv1800.h>
> > +
> > +    syscon@...0000 {
> > +      compatible = "sophgo,cv1800b-top-syscon", "syscon", "simple-mfd";
> > +      reg = <0x03000000 0x1000>;
> > +      #address-cells = <1>;
> > +      #size-cells = <1>;
> > +
> > +      usbphy: phy@48 {
> 
> Drop the labels off of these two, since they're unused in the example.
> 
> > +        compatible = "sophgo,cv1800b-usb2-phy";
> > +        reg = <0x48 0x4>;
> > +        #phy-cells = <0>;
> > +        clocks = <&clk CLK_USB_125M>,
> > +                 <&clk CLK_USB_33K>,
> > +                 <&clk CLK_USB_12M>;
> > +        clock-names = "app", "stb", "lpm";
> > +        resets = <&rst 58>;
> > +      };
> > +
> > +      dmamux: dma-router@154 {
> > +        compatible = "sophgo,cv1800b-dmamux";
> > +        reg = <0x154 0x8>, <0x298 0x4>;
> > +        #dma-cells = <2>;
> > +        dma-masters = <&dmac>;
> > +      };
> > +    };
> > +
> > +...
> > --
> > 2.51.0



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