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

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Date: Fri, 14 Jul 2023 20:47:11 -0600
From: Rob Herring <robh@...nel.org>
To: Samin Guo <samin.guo@...rfivetech.com>
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

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.

> +    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
>