netdev - Re: [PATCH net-next 2/2] net: axienet: Add support for AXI 2.5G MAC

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Message-ID: <ZztjvkxbCiLER-PJ@shell.armlinux.org.uk>
Date: Mon, 18 Nov 2024 15:56:46 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Suraj Gupta <suraj.gupta2@....com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, michal.simek@....com,
	sean.anderson@...ux.dev, radhey.shyam.pandey@....com,
	horms@...nel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	git@....com, harini.katakam@....com
Subject: Re: [PATCH net-next 2/2] net: axienet: Add support for AXI 2.5G MAC

On Mon, Nov 18, 2024 at 01:48:22PM +0530, Suraj Gupta wrote:
> Add AXI 2.5G MAC support, which is an incremental speed upgrade
> of AXI 1G MAC and supports 2.5G speed only. "max-speed" DT property
> is used in driver to distinguish 1G and 2.5G MACs of AXI 1G/2.5G IP.
> If max-speed property is missing, 1G is assumed to support backward
> compatibility.
> 
> Co-developed-by: Harini Katakam <harini.katakam@....com>
> Signed-off-by: Harini Katakam <harini.katakam@....com>
> Signed-off-by: Suraj Gupta <suraj.gupta2@....com>
> ---

...

> -	lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE |
> -		MAC_10FD | MAC_100FD | MAC_1000FD;
> +	lp->phylink_config.mac_capabilities = MAC_SYM_PAUSE | MAC_ASYM_PAUSE;
> +
> +	/* Set MAC capabilities based on MAC type */
> +	if (lp->max_speed == SPEED_1000)
> +		lp->phylink_config.mac_capabilities |= MAC_10FD | MAC_100FD | MAC_1000FD;
> +	else
> +		lp->phylink_config.mac_capabilities |= MAC_2500FD;

The MAC can only operate at (10M, 100M, 1G) _or_ 2.5G ?

Normally, max speeds can be limited using phylink_limit_mac_speed()
which will clear any MAC capabilities for speeds faster than the
speed specified.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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