linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: mediatek,xfi-tphy: add new bindings

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Date: Sun, 4 Feb 2024 06:17:53 +0000
From: Chunfeng Yun (云春峰) <Chunfeng.Yun@...iatek.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	SkyLake Huang (黃啟澤)
	<SkyLake.Huang@...iatek.com>, "kishon@...nel.org" <kishon@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "john@...ozen.org"
	<john@...ozen.org>, "krzysztof.kozlowski@...aro.org"
	<krzysztof.kozlowski@...aro.org>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>,
	Bc-bocun Chen (陳柏村)
	<bc-bocun.chen@...iatek.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	Steven Liu (劉人豪) <steven.liu@...iatek.com>,
	"vkoul@...nel.org" <vkoul@...nel.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "daniel@...rotopia.org"
	<daniel@...rotopia.org>, "linux-phy@...ts.infradead.org"
	<linux-phy@...ts.infradead.org>, "dqfext@...il.com" <dqfext@...il.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/2] dt-bindings: phy: mediatek,xfi-tphy: add new bindings

On Fri, 2024-02-02 at 09:21 +0100, Krzysztof Kozlowski wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On 01/02/2024 22:52, Daniel Golle wrote:
> > Add bindings for the MediaTek XFI T-PHY Ethernet SerDes PHY found
> in the
> > MediaTek MT7988 SoC which can operate at various interfaces modes:
> > 
> > via USXGMII PCS:
> >  * USXGMII
> >  * 10GBase-R
> >  * 5GBase-R
> > 
> > via LynxI SGMII PCS:
> >  * 2500Base-X
> >  * 1000Base-X
> >  * Cisco SGMII (MAC side)
> > 
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> >  .../bindings/phy/mediatek,xfi-tphy.yaml       | 80
> +++++++++++++++++++
> >  1 file changed, 80 insertions(+)
> >  create mode 100644
> Documentation/devicetree/bindings/phy/mediatek,xfi-tphy.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/mediatek,xfi-
> tphy.yaml b/Documentation/devicetree/bindings/phy/mediatek,xfi-
> tphy.yaml
> > new file mode 100644
> > index 0000000000000..e897118dcf7e6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/mediatek,xfi-tphy.yaml
> > @@ -0,0 +1,80 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/phy/mediatek,xfi-tphy.yaml#
> 
> Please use compatible as filename. Your binding says only one is
> possible (const, not enum), so there is no reasoning for different
> filename.
> 
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MediaTek XFI T-PHY
> > +
> > +maintainers:
> > +  - Daniel Golle <daniel@...rotopia.org>
> > +
> > +description:
> > +  The MediaTek XFI SerDes T-PHY provides the physical SerDes lanes
> > +  used by the (10G/5G) USXGMII PCS and (1G/2.5G) LynxI PCS found
> in
> > +  MediaTek's 10G-capabale SoCs.
> > +
> > +properties:
> > +  $nodename:
> > +    pattern: "^phy@[0-9a-f]+$"
> 
> No need for nodename in individual bindings file.
> 
> > +
> > +  compatible:
> > +    const: mediatek,mt7988-xfi-tphy
Add a generic compatible "mediatek,xfi-tphy"?

Other socs also use this phy but not upstream.

> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: XFI PHY clock
> > +      - description: XFI register clock
> > +
> > +  clock-names:
> > +    items:
> > +      - const: xfipll
> > +      - const: topxtal
> > +
> > +  resets:
> > +    items:
> > +      - description: PEXTP reset
> > +
> > +  mediatek,usxgmii-performance-errata:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description:
> > +      One instance of the T-PHY on MT7988 suffers from a
> performance
> > +      problem in 10GBase-R mode which needs a work-around in the
> driver.
> 
> Can you explain what is this issue and errata about (except
> performance)?
> 
> > +      The work-around is enabled using this flag.
> > +
> > +  "#phy-cells":
> > +    const: 0
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - resets
> > +  - "#phy-cells"
> > +
> > +additionalProperties: false
> 
> 
> Best regards,
> Krzysztof
>