netdev - Re: [PATCH net-next v1 1/3] dt-bindings: net: Add Motorcomm yt8xxx ethernet phy Driver bindings

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Date:   Fri, 6 Jan 2023 17:17:04 +0800
From:   "Frank.Sae" <Frank.Sae@...or-comm.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Peter Geis <pgwipeout@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     xiaogang.fan@...or-comm.com, fei.zhang@...or-comm.com,
        hua.sun@...or-comm.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/3] dt-bindings: net: Add Motorcomm yt8xxx
 ethernet phy Driver bindings

Hi Krzysztof Kozlowski,

On 2023/1/6 16:26, Krzysztof Kozlowski wrote:
> On 05/01/2023 08:30, Frank wrote:
>> Add a YAML binding document for the Motorcom yt8xxx Ethernet phy driver.
>>
> 
> Subject: drop second, redundant "Driver bindings".

Change Subject from
dt-bindings: net: Add Motorcomm yt8xxx ethernet phy Driver bindings
to
dt-bindings: net: Add Motorcomm yt8xxx ethernet phy
?

> 
>> Signed-off-by: Frank <Frank.Sae@...or-comm.com>
> 
> Use full first and last name. Your email suggests something more than
> only "Frank".
> 

OK , I will use  Frank.Sae <Frank.Sae@...or-comm.com>

>> ---
>>  .../bindings/net/motorcomm,yt8xxx.yaml        | 180 ++++++++++++++++++
>>  .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
>>  MAINTAINERS                                   |   1 +
>>  3 files changed, 183 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>> new file mode 100644
>> index 000000000000..337a562d864c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>> @@ -0,0 +1,180 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/net/motorcomm,yt8xxx.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MotorComm yt8xxx Ethernet PHY
>> +
>> +maintainers:
>> +  - frank <frank.sae@...or-comm.com>
>> +
>> +description: |
>> +  Bindings for MotorComm yt8xxx PHYs.
> 
> Instead describe the hardware. No need to state the obvious that these
> are bindings.
> 

I will fix.

>> +  yt8511 will be supported later.
> 
> Bindings should be complete. Your driver support is not relevant here.

I will fix.

> 
>> +
>> +allOf:
>> +  - $ref: ethernet-phy.yaml#
>> +
>> +properties:
>> +  motorcomm,clk-out-frequency:
> 
> Use property suffixes matching the type.
> 
>> +    description: clock output in Hertz on clock output pin.
> 
> Drop "Hertz". It should be obvious from the suffix.
> 
>> +    $ref: /schemas/types.yaml#/definitions/uint32
> 
> Drop.
> 
> Anyway, does it fit standard clock-frequency property?
> 
>> +    enum: [0, 25000000, 125000000]
>> +    default: 0
>> +

Yes, I will fix.

>> +  motorcomm,rx-delay-basic:
>> +    description: |
>> +      Tristate, setup the basic RGMII RX Clock delay of PHY.
>> +      This basic delay is fixed at 2ns (1000Mbps) or 8ns (100Mbps、10Mbps).
>> +      This basic delay usually auto set by hardware according to the voltage
>> +      of RXD0 pin (low = 0, turn off;   high = 1, turn on).
>> +      If not exist, this delay is controlled by hardware.
> 
> I don't understand that at all. What "not exist"? There is no verb and
> no subject.
> 
> The type and description are really unclear.
> 
>> +      0: turn off;   1: turn on.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [0, 1]
> 
> So this is bool?
> 

This basic delay can be controlled by hardware or dts.

Default value depends on power on strapping, according to the voltage
of RXD0 pin (low = 0, turn off;   high = 1, turn on).

"not exist" means that This basic delay is controlled by hardware,
and software don't change this.

I will fix.

>> +
>> +  motorcomm,rx-delay-additional-ps:
>> +    description: |
>> +      Setup the additional RGMII RX Clock delay of PHY defined in pico seconds.
>> +      RGMII RX Clock Delay = rx-delay-basic + rx-delay-additional-ps.
>> +    enum:
> 
> Best regards,
> Krzysztof