linux-kernel - Re: [PATCH net-next 1/2] dt-bindings: dp83td510: Add binding for DP83TD510 Ethernet PHY

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Message-ID: <b704d919-b665-04e7-39bf-fadd5bc35ecf@gmail.com>
Date:   Thu, 8 Oct 2020 10:11:18 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Dan Murphy <dmurphy@...com>, davem@...emloft.net, andrew@...n.ch,
        hkallweit1@...il.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] dt-bindings: dp83td510: Add binding for
 DP83TD510 Ethernet PHY



On 10/8/2020 9:23 AM, Dan Murphy wrote:
> The DP83TD510 is a 10M single twisted pair Ethernet PHY
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>   .../devicetree/bindings/net/ti,dp83td510.yaml | 70 +++++++++++++++++++
>   1 file changed, 70 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/net/ti,dp83td510.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/ti,dp83td510.yaml b/Documentation/devicetree/bindings/net/ti,dp83td510.yaml
> new file mode 100644
> index 000000000000..0f0eac77a11a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/ti,dp83td510.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Texas Instruments Incorporated
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/net/ti,dp83td510.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: TI DP83TD510 ethernet PHY
> +
> +allOf:
> +  - $ref: "ethernet-controller.yaml#"
> +
> +maintainers:
> +  - Dan Murphy <dmurphy@...com>
> +
> +description: |
> +  The PHY is an twisted pair 10Mbps Ethernet PHY that support MII, RMII and
> +  RGMII interfaces.
> +
> +  Specifications about the Ethernet PHY can be found at:
> +    http://www.ti.com/lit/ds/symlink/dp83td510e.pdf
> +
> +properties:
> +  reg:
> +    maxItems: 1
> +
> +  tx-fifo-depth:
> +    description: |
> +       Transmitt FIFO depth for RMII mode.  The PHY only exposes 4 nibble
> +       depths. The valid nibble depths are 4, 5, 6 and 8.
> +    default: 5
> +
> +  rx-internal-delay-ps:
> +    description: |
> +       Setting this property to a non-zero number sets the RX internal delay
> +       for the PHY.  The internal delay for the PHY is fixed to 30ns relative
> +       to receive data.
> +
> +  tx-internal-delay-ps:
> +    description: |
> +       Setting this property to a non-zero number sets the TX internal delay
> +       for the PHY.  The internal delay for the PHY has a range of -4 to 4ns
> +       relative to transmit data.

Those two properties are already defined as part of 
Documentation/devicetree/bindings/net/ethernet-phy.yaml, so you can 
reference that binding, too.

> +
> +  ti,master-slave-mode:
> +    $ref: /schemas/types.yaml#definitions/uint32
> +    default: 0
> +    description: |
> +      Force the PHY to be configured to a specific mode.
> +      Force Auto Negotiation - 0
> +      Force Master mode at 1v p2p - 1
> +      Force Master mode at 2.4v p2p - 2
> +      Force Slave mode at 1v p2p - 3
> +      Force Slave mode at 2.4v p2p - 4

If you accept different values you should be indicating which values are 
supported with an enumeration.
-- 
Florian