linux-kernel - Re: [PATCH v2 3/5] dt-bindings: net: Add HPE GXP UMAC

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Message-ID: <20230803-balance-octopus-3d36f784f776@spud>
Date:   Thu, 3 Aug 2023 16:52:09 +0100
From:   Conor Dooley <conor@...nel.org>
To:     nick.hawkins@....com
Cc:     christophe.jaillet@...adoo.fr, simon.horman@...igine.com,
        andrew@...n.ch, verdun@....com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] dt-bindings: net: Add HPE GXP UMAC

On Wed, Aug 02, 2023 at 03:18:22PM -0500, nick.hawkins@....com wrote:
> From: Nick Hawkins <nick.hawkins@....com>
> 
> Provide access to the register regions and interrupt for Universal
> MAC(UMAC). The driver under the hpe,gxp-umac binding will provide an
> interface for sending and receiving networking data from both of the
> UMACs on the system.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@....com>
> 
> ---
> 
> v2:
>  *Move mac-addresses into ports
>  *Remove | where not needed
> ---
>  .../devicetree/bindings/net/hpe,gxp-umac.yaml | 112 ++++++++++++++++++
>  1 file changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/hpe,gxp-umac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/hpe,gxp-umac.yaml b/Documentation/devicetree/bindings/net/hpe,gxp-umac.yaml
> new file mode 100644
> index 000000000000..ff1a3a201dcf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/hpe,gxp-umac.yaml
> @@ -0,0 +1,112 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/hpe,gxp-umac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HPE GXP Unified MAC Controller
> +
> +maintainers:
> +  - Nick Hawkins <nick.hawkins@....com>
> +
> +description:
> +  HPE GXP 802.3 10/100/1000T Ethernet Unifed MAC controller.
> +  Device node of the controller has following properties.
> +
> +properties:
> +  compatible:
> +    const: hpe,gxp-umac
> +

> +  use-ncsi:
> +    type: boolean
> +    description:
> +      Indicates if the device should use NCSI (Network Controlled
> +      Sideband Interface).

How is one supposed to know if the device should use NCSI? If the
property is present does that mean that the mac hardware supports
it? Or is it determined by what board this mac is on?
Or is this software configuration?

Thanks,
Conor.

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