linux-kernel - Re: [PATCH v4 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg

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Message-ID: <c0f533a4-d196-649b-957e-eea6cd9e227c@starfivetech.com>
Date:   Mon, 17 Jul 2023 16:35:28 +0800
From:   Guo Samin <samin.guo@...rfivetech.com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <netdev@...r.kernel.org>, Peter Geis <pgwipeout@...il.com>,
        Frank <Frank.Sae@...or-comm.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Conor Dooley <conor@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        "Heiner Kallweit" <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: net: motorcomm: Add pad driver
 strength cfg

-------- 原始信息 --------
主题: Re: [PATCH v4 1/2] dt-bindings: net: motorcomm: Add pad driver strength cfg
From: Rob Herring <robh@...nel.org>
收件人: Samin Guo <samin.guo@...rfivetech.com>
日期: 2023/7/15

> On Fri, Jul 14, 2023 at 06:14:05PM +0800, Samin Guo wrote:
>> The motorcomm phy (YT8531) supports the ability to adjust the drive
>> strength of the rx_clk/rx_data.
>>
>> The YT8531 RGMII LDO voltage supports 1.8V/3.3V, and the
>> LDO voltage can be configured with hardware pull-up resistors to match
>> the SOC voltage (usually 1.8V). The software can read the registers
>> 0xA001 obtain the current LDO voltage value.
>>
>> When we configure the drive strength, we need to read the current LDO
>> voltage value to ensure that it is a legal value at that LDO voltage.
>>
>> Reviewed-by: Hal Feng <hal.feng@...rfivetech.com>
>> Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
>> ---
>>  .../bindings/net/motorcomm,yt8xxx.yaml        | 46 +++++++++++++++++++
>>  1 file changed, 46 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>> index 157e3bbcaf6f..097bf143af35 100644
>> --- a/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>> +++ b/Documentation/devicetree/bindings/net/motorcomm,yt8xxx.yaml
>> @@ -52,6 +52,52 @@ properties:
>>        for a timer.
>>      type: boolean
>>  
>> +  motorcomm,rx-clk-driver-strength:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
> 
> As the units are uA, drop the type and add '-microamp' suffix. 
> 'motorcomm,rx-clk-drv-microamp' is probably sufficient.
>
Thanks for the guidance, will be improved in the next version.
 
>> +    description: |
>> +      drive strength of rx_clk rgmii pad.
>> +      |----------------------------------|
>> +      |        rx_clk ds map table       |
>> +      |----------------------------------|
>> +      | DS(3b) |  wol@...v  |  wol@...v  |
>> +      |________|_________________________|
>> +      |        | current(uA)| current(uA)|
>> +      |   000  |     1200   |    3070    |
>> +      |   001  |     2100   |    4080    |
>> +      |   010  |     2700   |    4370    |
>> +      |   011  |     2910   |    4680    |
>> +      |   100  |     3110   |    5020    |
>> +      |   101  |     3600   |    5450    |
>> +      |   110  |     3970   |    5740    |
>> +      |   111  |     4350   |    6140    |
>> +      |--------|------------|------------|
>> +    enum: [ 1200, 2100, 2700, 2910, 3070, 3110, 3600, 3970,
>> +            4080, 4350, 4370, 4680, 5020, 5450, 5740, 6140 ]
>> +    default: 2910
>> +
>> +  motorcomm,rx-data-driver-strength:
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      drive strength of rx_data/rx_ctl rgmii pad.
>> +      |----------------------------------|
>> +      |        rx_data ds map table      |
>> +      |----------------------------------|
>> +      | DS(3b) |  wol@...v  |  wol@...v  |
>> +      |________|_________________________|
>> +      |        | current(uA)| current(uA)|
>> +      |   000  |     1200   |    3070    |
>> +      |   001  |     2100   |    4080    |
>> +      |   010  |     2700   |    4370    |
>> +      |   011  |     2910   |    4680    |
>> +      |   100  |     3110   |    5020    |
>> +      |   101  |     3600   |    5450    |
>> +      |   110  |     3970   |    5740    |
>> +      |   111  |     4350   |    6140    |
>> +      |--------|------------|------------|
>> +    enum: [ 1200, 2100, 2700, 2910, 3070, 3110, 3600, 3970,
>> +            4080, 4350, 4370, 4680, 5020, 5450, 5740, 6140 ]
>> +    default: 2910
>> +
>>    motorcomm,tx-clk-adj-enabled:
>>      description: |
>>        This configuration is mainly to adapt to VF2 with JH7110 SoC.
>> -- 
>> 2.17.1
>>

Best regards,
Samin