linux-kernel - Re: [PATCH 2/7] dt-bindings: phy: add binding document for Allwinner F1C100s USB PHY

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Message-ID: <20220616155934.GA3543984-robh@kernel.org>
Date:   Thu, 16 Jun 2022 09:59:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Icenowy Zheng <uwu@...nowy.me>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bin Liu <b-liu@...com>, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/7] dt-bindings: phy: add binding document for Allwinner
 F1C100s USB PHY

On Wed, Jun 08, 2022 at 10:52:52PM +0800, Icenowy Zheng wrote:
> 在 2022-06-08星期三的 08:49 -0600，Rob Herring写道：
> > On Wed, Jun 08, 2022 at 03:04:47PM +0800, Icenowy Zheng wrote:
> > > Allwinner F1C100s has the most simple USB PHY among all Allwinner
> > > SoCs,
> > > because it has only one OTG USB controller, no host-only OHCI/EHCI
> > > controllers.
> > > 
> > > Add a binding document for it.
> > > 
> > > Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> > > ---
> > >  .../phy/allwinner,suniv-f1c100s-usb-phy.yaml  | 83
> > > +++++++++++++++++++
> > >  1 file changed, 83 insertions(+)
> > >  create mode 100644
> > > Documentation/devicetree/bindings/phy/allwinner,suniv-f1c100s-usb-
> > > phy.yaml
> > > 
> > > diff --git a/Documentation/devicetree/bindings/phy/allwinner,suniv-
> > > f1c100s-usb-phy.yaml
> > > b/Documentation/devicetree/bindings/phy/allwinner,suniv-f1c100s-
> > > usb-phy.yaml
> > > new file mode 100644
> > > index 000000000000..180fa8840bf7
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/phy/allwinner,suniv-
> > > f1c100s-usb-phy.yaml
> > > @@ -0,0 +1,83 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > 
> > Dual license please.
> 
> I am based on another Allwinner USB PHY binding file in the same
> directory, and that file is single licensed. I created a new file
> because each variant of the PHY has a single file now.

Okay, describing the source and the differences in the commit message 
would be helpful.

> 
> > 
> > > +%YAML 1.2
> > > +---
> > > +$id:
> > > http://devicetree.org/schemas/phy/allwinner,suniv-f1c100s-usb-phy.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Allwinner F1C100s USB PHY Device Tree Bindings
> > > +
> > > +maintainers:
> > > +  - Chen-Yu Tsai <wens@...e.org>
> > > +  - Maxime Ripard <mripard@...nel.org>
> > > +
> > > +properties:
> > > +  "#phy-cells":
> > > +    const: 1
> > > +
> > > +  compatible:
> > > +    const: allwinner,suniv-f1c100s-usb-phy
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +    description: PHY Control registers
> > > +
> > > +  reg-names:
> > > +    const: phy_ctrl
> > > +
> > > +  clocks:
> > > +    maxItems: 1
> > > +    description: USB OTG PHY bus clock
> > > +
> > > +  clock-names:
> > > +    const: usb0_phy
> > 
> > *-names is not needed with only one entry. Plus, just using the
> > module 
> > name is not a great choice.
> 
> However the driver expects it...
> 
> Should I patch the driver to use no name on F1C100s?
> 
> > 
> > > +
> > > +  resets:
> > > +    maxItems: 1
> > > +    description: USB OTG reset
> > > +
> > > +  reset-names:
> > > +    const: usb0_reset
> > 
> > Same here.
> > 
> > > +  usb0_id_det-gpios:
> > > +    maxItems: 1
> > > +    description: GPIO to the USB OTG ID pin
> > > +
> > > +  usb0_vbus_det-gpios:
> > > +    maxItems: 1
> > > +    description: GPIO to the USB OTG VBUS detect pin
> > > +
> > > +  usb0_vbus_power-supply:
> > > +    description: Power supply to detect the USB OTG VBUS
> > > +
> > > +  usb0_vbus-supply:
> > > +    description: Regulator controlling USB OTG VBUS
> > 
> > Why the 'usb0_' prefix?
> > 
> > Are these GPIOs and Vbus supply connected to the phy? If not, these
> > all 
> > belong in a connector node (as that is where they are connected to in
> > h/w).
> 
> Well these are historical things of phy-sun4i-usb driver too.

Okay, there should perhaps be a common schema so this sharing is clear. 
Though longer term there should be a move to the common way of handling 
these for new platforms.

So I guess in summary:

Reviewed-by: Rob Herring <robh@...nel.org>