netdev - Re: [PATCH net-next v3 8/8] dt-bindings: net: sparx5: document RGMII delays

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Message-ID: <20241119182255.GA1967508-robh@kernel.org>
Date: Tue, 19 Nov 2024 12:22:55 -0600
From: Rob Herring <robh@...nel.org>
To: Daniel Machon <daniel.machon@...rochip.com>
Cc: UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Russell King <linux@...linux.org.uk>, jacob.e.keller@...el.com,
	krzk+dt@...nel.org, conor+dt@...nel.org, devicetree@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v3 8/8] dt-bindings: net: sparx5: document RGMII
 delays

On Mon, Nov 18, 2024 at 02:00:54PM +0100, Daniel Machon wrote:
> The lan969x switch device supports two RGMII port interfaces that can be
> configured for MAC level rx and tx delays.
> 
> Document two new properties {rx,tx}-internal-delay-ps. Make them
> required properties, if the phy-mode is one of: rgmii, rgmii_id,
> rgmii-rxid or rgmii-txid. Also specify accepted values.

Doesn't look like they are required to me.

> 
> Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
> ---
>  .../bindings/net/microchip,sparx5-switch.yaml          | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml b/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> index dedfad526666..2e9ef0f7bb4b 100644
> --- a/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> +++ b/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> @@ -129,6 +129,24 @@ properties:
>              minimum: 0
>              maximum: 383
>  
> +          rx-internal-delay-ps:
> +            description: |

Don't need '|' if there is not formatting to preserve.

> +              RGMII Receive Clock Delay defined in pico seconds, used to select
> +              the DLL phase shift between 1000 ps (45 degree shift at 1Gbps) and
> +              3300 ps (147 degree shift at 1Gbps). A value of 0 ps will disable
> +              any delay. The Default is no delay.
> +            enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
> +            default: 0
> +
> +          tx-internal-delay-ps:
> +            description: |
> +              RGMII Transmit Clock Delay defined in pico seconds, used to select
> +              the DLL phase shift between 1000 ps (45 degree shift at 1Gbps) and
> +              3300 ps (147 degree shift at 1Gbps). A value of 0 ps will disable
> +              any delay. The Default is no delay.
> +            enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
> +            default: 0
> +
>          required:
>            - reg
>            - phys
> 
> -- 
> 2.34.1
>