linux-kernel - Re: [PATCH v3 2/3] dt-bindings: phy: Add i.MX8Q HSIO SerDes PHY binding

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Date: Wed, 24 Apr 2024 10:39:22 -0400
From: Frank Li <Frank.li@....com>
To: Richard Zhu <hongxing.zhu@....com>
Cc: Richard Zhu <hongxing.zhu@....com>, vkoul@...nel.org, kishon@...nel.org,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	imx@...ts.linux.dev
Subject: Re: [PATCH v3 2/3] dt-bindings: phy: Add i.MX8Q HSIO SerDes PHY
 binding

On Wed, Apr 24, 2024 at 01:04:27PM +0100, Conor Dooley wrote:
> On Wed, Apr 24, 2024 at 02:21:22PM +0800, Richard Zhu wrote:
> > Add i.MX8QM and i.MX8QXP HSIO SerDes PHY binding.
> > Introduce one HSIO configuration 'fsl,hsio-cfg', which need be set at
> > initialization according to board design.
> > 
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  .../bindings/phy/fsl,imx8qm-hsio.yaml         | 146 ++++++++++++++++++
> >  1 file changed, 146 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/fsl,imx8qm-hsio.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8qm-hsio.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8qm-hsio.yaml
> > new file mode 100644
> > index 000000000000..3e2824d1616c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/fsl,imx8qm-hsio.yaml
> > @@ -0,0 +1,146 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/phy/fsl,imx8qm-hsio.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Freescale i.MX8QM SoC series HSIO SERDES PHY
> > +
> > +maintainers:
> > +  - Richard Zhu <hongxing.zhu@....com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - fsl,imx8qm-hsio
> > +      - fsl,imx8qxp-hsio
> > +  reg:
> > +    minItems: 4
> > +    maxItems: 4
> > +
> > +  "#phy-cells":
> > +    const: 3
> > +    description:
> > +      The first defines the type of the PHY refer to the include phy.h.
> > +      The second defines controller index.
> > +      The third defines the lane mask of the lane ID, indicated which
> > +      lane is used by the PHY. They are defined as HSIO_LAN* in
> > +      dt-bindings/phy/phy-imx8-pcie.h
> > +
> > +  reg-names:
> > +    items:
> > +      - const: reg
> > +      - const: phy
> > +      - const: ctrl
> > +      - const: misc
> > +
> > +  clocks:
> > +    minItems: 5
> > +    maxItems: 14
> > +
> > +  clock-names:
> > +    minItems: 5
> > +    maxItems: 14
> > +
> > +  fsl,hsio-cfg:
> > +    description: Refer macro HSIO_CFG* include/dt-bindings/phy/phy-imx8-pcie.h.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +
> > +  fsl,refclk-pad-mode:
> > +    description:
> > +      Specifies the mode of the refclk pad used. It can be UNUSED(PHY
> > +      refclock is derived from SoC internal source), INPUT(PHY refclock
> > +      is provided externally via the refclk pad) or OUTPUT(PHY refclock
> > +      is derived from SoC internal source and provided on the refclk pad).
> > +      Refer include/dt-bindings/phy/phy-imx8-pcie.h for the constants
> > +      to be used.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    default: IMX8_PCIE_REFCLK_PAD_OUTPUT
> 
> My comments on this are still not addressed. Please go back and read my
> comments about this property on v1.

Richard: I think we missunderstand conor's means at v1.

"Why do we need numbers and a header here at all? The enum should be an
enum of strings input, output & unused. Oh and "unused" can just be
dropped, and not having the property at all would mean "unused"."

fsl,refclk-pad-mode:
  description:
    ...
  enum: ["input", "output"].

If not exist "fsl,refclk-pad-mode" means "unused".

Frank