Date:   Fri, 19 Aug 2022 02:11:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     andrei.tachici@...d.acs.upb.ro
Cc:     linux-kernel@...r.kernel.org, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        vegard.nossum@...cle.com, joel@....id.au, l.stelmach@...sung.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org
Subject: Re: [net-next v4 2/3] net: ethernet: adi: Add ADIN1110 support

On Wed, Aug 17, 2022 at 07:02:35PM +0300, andrei.tachici@...d.acs.upb.ro wrote:
> From: Alexandru Tachici <alexandru.tachici@...log.com>
> 
> The ADIN1110 is a low power single port 10BASE-T1L MAC-PHY
> designed for industrial Ethernet applications. It integrates
> an Ethernet PHY core with a MAC and all the associated analog
> circuitry, input and output clock buffering.
> 
> ADIN1110 MAC-PHY encapsulates the ADIN1100 PHY. The PHY registers
> can be accessed through the MDIO MAC registers.
> We are registering an MDIO bus with custom read/write in order
> to let the PHY to be discovered by the PAL. This will let
> the ADIN1100 Linux driver to probe and take control of
> the PHY.
> 
> The ADIN2111 is a low power, low complexity, two-Ethernet ports
> switch with integrated 10BASE-T1L PHYs and one serial peripheral
> interface (SPI) port.
> 
> The device is designed for industrial Ethernet applications using
> low power constrained nodes and is compliant with the IEEE 802.3cg-2019
> Ethernet standard for long reach 10 Mbps single pair Ethernet (SPE).
> The switch supports various routing configurations between
> the two Ethernet ports and the SPI host port providing a flexible
> solution for line, daisy-chain, or ring network topologies.
> 
> The ADIN2111 supports cable reach of up to 1700 meters with ultra
> low power consumption of 77 mW. The two PHY cores support the
> 1.0 V p-p operating mode and the 2.4 V p-p operating mode defined
> in the IEEE 802.3cg standard.
> 
> The device integrates the switch, two Ethernet physical layer (PHY)
> cores with a media access control (MAC) interface and all the
> associated analog circuitry, and input and output clock buffering.
> 
> The device also includes internal buffer queues, the SPI and
> subsystem registers, as well as the control logic to manage the reset
> and clock control and hardware pin configuration.
> 
> Access to the PHYs is exposed via an internal MDIO bus. Writes/reads
> can be performed by reading/writing to the ADIN2111 MDIO registers
> via SPI.
> 
> On probe, for each port, a struct net_device is allocated and
> registered. When both ports are added to the same bridge, the driver
> will enable offloading of frame forwarding at the hardware level.
> 
> Driver offers STP support. Normal operation on forwarding state.
> Allows only frames with the 802.1d DA to be passed to the host
> when in any of the other states.
> 
> Supports both VEB and VEPA modes. In VEB mode multicast/broadcast
> and unknown frames are handled by the ADIN2111, sw bridge will
> not see them (this is to save SPI bandwidth). In VEPA mode,
> all forwarding will be handled by the sw bridge, ADIN2111 will
> not attempt to forward any frames in hardware to the other port.
> 
> Co-developed-by: Lennart Franzen <lennart@...omain.com>
> Signed-off-by: Lennart Franzen <lennart@...omain.com>
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew

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