linux-kernel - Re: [PATCH v1 2/2] dt-bindings: usb: Add bindings doc for Sunplus USB HOST OHCI driver

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Date:   Thu, 17 Mar 2022 18:24:33 +0800
From:   施錕鴻 <vincent.sunplus@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Greg KH <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 v1 2/2] dt-bindings: usb: Add bindings doc for Sunplus USB
 HOST OHCI driver

Hi, Krzysztof

Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> 於 2022年3月15日
週二 上午12:42寫道：
>
> On 14/03/2022 06:32, Vincent Shih wrote:
> > Add bindings doc for Sunplus USB HOST OHCI driver
> >
> > Signed-off-by: Vincent Shih <vincent.sunplus@...il.com>
> > ---
> >  .../bindings/usb/sunplus,sp7021-usb-ohci.yaml      | 69 ++++++++++++++++++++++
> >  MAINTAINERS                                        |  1 +
> >  2 files changed, 70 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ohci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ohci.yaml b/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ohci.yaml
> > new file mode 100644
> > index 0000000..7583b68
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/sunplus,sp7021-usb-ohci.yaml
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +# Copyright (C) Sunplus Co., Ltd. 2021
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/usb/sunplus,sp7021-usb-ohci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
>
> Looks good. Few minor nitpicks:
>
> > +title: Sunplus SP7021 OHCI Controller Device Tree Bindings
>
> Remove "Device Tree Bindings" words here. Title is about hardware.
>

Yes, I will remove it.

> > +
> > +allOf:
> > +  - $ref: usb-hcd.yaml#
>
> Put entire "allOf:" just before "properties:".

Yes, I will modify it.

>
> > +
> > +maintainers:
> > +  - Vincent Shih <vincent.sunplus@...il.com>
> > +
> > +description:
> > +  Sunplus SP7021 USB HOST IP is a USB2.0 Host Controller. It supports both
> > +  Enhanced Host Controller Interface (EHCI) and Open Host Controller Interface
> > +  (OHCI).
> > +
> > +  It supports 32-bits address bus and 64bit data bus interface, compliant
> > +  to AMBA AXI interface for data transfer.
> > +
> > +  It supports 32-bits address and data bus interface, compliant to AMBA
> > +  AHB interface for register configurations.
> > +
> > +  It supports 32-bits address and data bus interface, compliant to AMBA
> > +  AXI interface for register alternative configurations.
> > +
> > +  The UTM Interface block generates PHY control signals, compliant to
> > +  USB2.0 Transceiver Macrocell Interface Specification Revision 1.0.
> > +
> > +properties:
> > +  compatible:
> > +    const: sunplus,sp7021-usb-ohci
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  resets:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
>
> You might need here phys. Are you sure you do not need to configure the
> phy for OHCI? You should not assume it would be configured by other driver.
>

Yes, OHCI driver does not need to configure phy according to the
suggestion of our RD.
The default status of phy after power-on is good enough for OHCI.

> Best regards,
> Krzysztof

Thanks for your review.