linux-kernel - Re: [PATCH v3 2/2] dt-bindings: usb: Add bindings doc for Sunplus EHCI driver

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Message-ID: <67ec6f3a-1579-f77a-a54d-381472252d6b@canonical.com>
Date:   Sun, 6 Mar 2022 13:07:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Vincent Shih <vincent.sunplus@...il.com>,
        gregkh@...uxfoundation.org, stern@...land.harvard.edu,
        p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, wells.lu@...plus.com
Subject: Re: [PATCH v3 2/2] dt-bindings: usb: Add bindings doc for Sunplus
 EHCI driver

On 06/03/2022 07:10, Vincent Shih wrote:
> Add bindings doc for Sunplus EHCI driver
> 
> Signed-off-by: Vincent Shih <vincent.sunplus@...il.com>
> ---
> Changes in v2:
>   - Address the comments by Rob Herring.
> 
>  .../bindings/usb/sunplus,sp7021-usb-ehci.yaml      | 63 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ehci.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ehci.yaml b/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ehci.yaml
> new file mode 100644
> index 0000000..905f68c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ehci.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) Sunplus Co., Ltd. 2021
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/sunplus,sp7021-usb-ehci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sunplus SP7021 EHCI Controller Device Tree bindings

s/Device Tree bindings//
(title describes hardware)

> +
> +allOf:
> +  - $ref: usb-hcd.yaml#
> +
> +maintainers:
> +  - Vincent Shih <vincent.sunplus@...il.com>
> +
> +properties:
> +  compatible:
> +    const: sunplus,sp7021-usb2-ehci

You do not use this compatible in the driver.

> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    minItems: 1

Suddenly it became minItems. This looks odd, it should be maxItems: 1
rather. How many reset lines do you have there?


> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  phys:
> +    maxItems: 1
> +
> +  phy-names:
> +    maxItems: 1

phy-names needs list of names.

> +
> +required:
> +  - compatible
> +  - clocks
> +  - resets
> +  - reg
> +  - interrupts
> +  - phys
> +  - phy-names
> +
> +additionalProperties: false

This should be unevaluatedProperties:false, because you reference
usb-hcd schema.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    sp_ehci0: usb@...02100 {
> +      compatible = "sunplus,sp7021-usb-ehci";
> +      clocks = <&clkc 0x3a>;
> +      resets = <&rstc 0x2a>;
> +      reg = <0x9c102100 0x68>;

reg goes after compatible in DTS.

Best regards,
Krzysztof