linux-kernel - Re: [PATCH v2 2/3] dt-bindings: mfd: Add Realtek MISC system controller

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Message-ID: <20251113-ritzy-excluding-e2067916896e@spud>
Date: Thu, 13 Nov 2025 19:31:13 +0000
From: Conor Dooley <conor@...nel.org>
To: Yu-Chun Lin <eleanor.lin@...ltek.com>
Cc: afaerber@...e.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, lee@...nel.org, james.tai@...ltek.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-realtek-soc@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, cy.huang@...ltek.com,
	stanley_chang@...ltek.com
Subject: Re: [PATCH v2 2/3] dt-bindings: mfd: Add Realtek MISC system
 controller

On Thu, Nov 13, 2025 at 08:30:08PM +0800, Yu-Chun Lin wrote:
> Add DT binding schema for Realtek system controller.
> 
> Signed-off-by: Yu-Chun Lin <eleanor.lin@...ltek.com>
> ---
>  .../devicetree/bindings/mfd/realtek,misc.yaml | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/realtek,misc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/realtek,misc.yaml b/Documentation/devicetree/bindings/mfd/realtek,misc.yaml
> new file mode 100644
> index 000000000000..4f4a9ae250be
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/realtek,misc.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/realtek,misc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Realtek MISC System Controller
> +
> +description:
> +  The Realtek MISC System Controller is a register area that contains
> +  miscellaneous system registers for the SoC and serves as a parent node
> +  for other functions.
> +
> +maintainers:
> +  - James Tai <james.tai@...ltek.com>
> +  - Yu-Chun Lin <eleanor.lin@...ltek.com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - realtek,misc

You need a soc-specific compatible. It's hard to believe that every
realtek device will have the exact same miscellaneous register region ;)

> +      - const: syscon
> +      - const: simple-mfd
> +
> +  reg:
> +    maxItems: 1
> +
> +  ranges:
> +    maxItems: 1
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
> +patternProperties:
> +  "^serial@[0-9a-f]+$":
> +    type: object
> +    description: UART controllers inside MISC area

How many of these actually are there?
If they're always dw uarts, please add a reference to that schema.

pw-bot: changes-requested

> +
> +required:
> +  - compatible
> +  - reg
> +  - ranges
> +  - '#address-cells'
> +  - '#size-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    syscon@...0 {
> +        compatible = "realtek,misc", "syscon", "simple-mfd";
> +        reg = <0x7000 0x1000>;
> +        ranges = <0x0 0x7000 0x1000>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        uart0: serial@800 {
> +            compatible = "snps,dw-apb-uart";
> +            reg = <0x800 0x100>;
> +            clock-frequency = <432000000>;
> +            interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>;
> +            reg-io-width = <4>;
> +            reg-shift = <2>;
> +            status = "disabled";
> +        };
> +    };
> -- 
> 2.34.1
> 

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