linux-kernel - Re: [PATCH V2 1/2] dt-bindings: usb: misc: Add binding for Microchip usb2244 Controller

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Message-ID: <YaWIafw+XB8tknpJ@robh.at.kernel.org>
Date:   Mon, 29 Nov 2021 20:11:53 -0600
From:   Rob Herring <robh@...nel.org>
To:     Piyush Mehta <piyush.mehta@...inx.com>
Cc:     gregkh@...uxfoundation.org, mka@...omium.org,
        ravisadineni@...omium.org, stern@...land.harvard.edu,
        alcooperx@...il.com, michal.simek@...inx.com,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, git@...inx.com, sgoud@...inx.com
Subject: Re: [PATCH V2 1/2] dt-bindings: usb: misc: Add binding for Microchip
 usb2244 Controller

On Mon, Nov 22, 2021 at 11:58:33AM +0530, Piyush Mehta wrote:
> Microchip's USB224x family of Hi-Speed USB 2.0 flash media card controllers
> provides an ultra-fast interface between a USB host controller and flash
> media cards.
> 
> Add dt-bindings documentation for Microchip's usb2244 Controller.
> USB224x is a USB 2.0 compliant ultra fast USB 2.0 multi-format,
> SD/MMC, and MS Flash Media Controllers.
> 
> Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
> ---
> Changes for V2:
> - Update reset polarity, make reset ACTIVE LOW in the dt-binding document.
> - Added usbsd node under the usb controller (usb0) node.
> - Remove Warning: decoded text below may be mangled, UTF-8 assumed.
> 
> Review comments:
> Link: https://lore.kernel.org/lkml/CAL_JsqKu6vr3iCz1G7MtK6gyqAvn4s4mpuLOwPzJDEmyZeROig@mail.gmail.com/
> ---
>  .../devicetree/bindings/usb/microchip,usb2244.yaml | 47 ++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/microchip,usb2244.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/microchip,usb2244.yaml b/Documentation/devicetree/bindings/usb/microchip,usb2244.yaml
> new file mode 100644
> index 0000000..1854313
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/microchip,usb2244.yaml
> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/usb/microchip,usb2244.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Bindings for the Microchip USB2244 Ultra Fast USB-SD Controller
> +
> +description:
> +  Microchip USB224x is a USB 2.0 compliant, Hi-Speed bulk only mass
> +  storage class peripheral controller intended for reading and writing
> +  to popular flash media from the xDPicture Card, Memory Stick (MS),
> +  Secure Digital (SD), and MultiMediaCard (MMC) families.
> +
> +  USB224x is a flash media card reader solution fully compliant with the
> +  USB 2.0 specification.
> +
> +maintainers:
> +  - Piyush Mehta <piyush.mehta@...inx.com>
> +
> +properties:
> +  compatible:
> +    const: microchip,usb2244
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description:
> +      The phandle and specifier for the GPIO that controls the RESET line of
> +      flash media controller.
> +
> +required:
> +  - compatible
> +  - reset-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    usb0 {
> +        usbsd {
> +            compatible = "microchip,usb2244";
> +            reset-gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
> +        };

This is not how the USB device binding works. See usb-device.yaml.

> +    };
> +
> +...
> -- 
> 2.7.4
> 
>