[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <b35cd9c1-6778-4ca7-9961-f7e98a60d20b@lunn.ch>
Date: Sat, 22 Jun 2024 20:44:01 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Kamil Horák (2N) <kamilh@...s.com>
Cc: florian.fainelli@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
netdev@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v9 3/4] dt-bindings: ethernet-phy: add optional brr-mode
flag
On Fri, Jun 21, 2024 at 01:26:32PM +0200, Kamil Horák (2N) wrote:
> There is a group of PHY chips supporting BroadR-Reach link modes in
> a manner allowing for more or less identical register usage as standard
> Clause 22 PHY.
> These chips support standard Ethernet link modes as well, however, the
> circuitry is mutually exclusive and cannot be auto-detected.
> The link modes in question are 100Base-T1 as defined in IEEE802.3bw,
> based on Broadcom's 1BR-100 link mode, and newly defined 10Base-T1BRR
> (1BR-10 in Broadcom documents).
>
> Add optional brr-mode flag to switch the PHY to BroadR-Reach mode.
>
> Signed-off-by: Kamil Horák (2N) <kamilh@...s.com>
> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> ---
> Documentation/devicetree/bindings/net/ethernet-phy.yaml | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> index 8fb2a6ee7e5b..0353ef98f2e1 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> @@ -93,6 +93,13 @@ properties:
> the turn around line low at end of the control phase of the
> MDIO transaction.
>
> + brr-mode:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Request the PHY to operate in BroadR-Reach mode. This means the
> + PHY will use the BroadR-Reach protocol to communicate with the other
> + end of the link, including LDS auto-negotiation if applicable.
DT is supposed to describe hardware, not configuration. So i would
have a different description. Say that the coupling to the cable is
that for BroadR-Reach, not standard base-T.
The driver can then imply it needs to configure the hardware to
BroadR-Reach.
Andrew
Powered by blists - more mailing lists