Re: [PATCH net-next 0/5] net: cadence: macb: add IEEE 802.3az EEE support

On Mon, Feb 23, 2026 at 10:04:07AM +0100, Nicolai Buchwitz wrote:

Add Energy Efficient Ethernet (IEEE 802.3az) support to the Cadence GEM
(macb) driver. The GEM MAC has hardware LPI registers but no built-in
idle timer, so the driver implements software-managed TX LPI using a
delayed_work timer, as recommended by Microchip's GMAC documentation.

The series is structured as follows:

  1. Register definitions: LPI counter offsets (0x270-0x27c), TXLPIEN
     bitfield (NCR bit 19), and a MACB_CAPS_EEE capability flag.

  2. LPI statistics: Expose the four hardware EEE counters (RX/TX LPI
     transitions and time) through ethtool -S, accumulated in software
     since they are clear-on-read.

  3. TX LPI engine: A delayed_work-based idle timer that enters LPI
     after 250ms of TX inactivity and wakes before transmit with a
     conservative 50us PHY wake delay. LPI entry is deferred 1 second
     after link-up per IEEE 802.3az.

  4. ethtool EEE ops: get_eee/set_eee delegating to phylink for PHY
     negotiation; the MAC-level TXLPIEN is controlled only from the
     phylink mac_link_up/mac_link_down callbacks.

This needs a rewrite - phylink has EEE support now, with new callbacks
and configuration. There is no need to use the obsolete (and incorrect)
phy_init_eee() anymore.

Please see:

e9f03a6a879b net: phylink: add support for notifying PCS about EEE

and

03abf2a7c654 net: phylink: add EEE management

Thanks.

-- 
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