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

[Michal Simek <michal.simek@xxxxxxxxxx>]

On 11/30/21 03:11, Rob Herring wrote:
> 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@xxxxxxxxxx>
> > ---
> > 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@xxxxxxxxxxxxxx/
> > ---
> >   .../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@xxxxxxxxxx>
> > +
> > +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.

Is this fine?

device@1 {
    compatible = "usb424,2240";
    reg = <1>;
    reset-gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
};

If yes, this means that we should use usb driver instead of platform driver.

Thanks,
Michal