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Date:   Sat, 30 May 2020 13:55:16 -0700
From:   Florian Fainelli <>
To:     Vladimir Oltean <>,
Subject: Re: [PATCH v2 net-next 13/13] net: dsa: felix: introduce support for
 Seville VSC9953 switch

On 5/30/2020 4:51 AM, Vladimir Oltean wrote:
> From: Maxim Kochetkov <>
> This is another switch from Vitesse / Microsemi / Microchip, that has
> 10 port (8 external, 2 internal) and is integrated into the Freescale /
> NXP T1040 PowerPC SoC. It is very similar to Felix from NXP LS1028A,
> except that this is a platform device and Felix is a PCI device, and it
> doesn't support IEEE 1588 and TSN.
> Like Felix, this driver configures its own PCS on the internal MDIO bus
> using a phy_device abstraction for it (yes, it will be refactored to use
> a raw mdio_device, like other phylink drivers do, but let's keep it like
> that for now). But unlike Felix, the MDIO bus and the PCS are not from
> the same vendor. The PCS is the same QorIQ/Layerscape PCS as found in
> Felix/ENETC/DPAA*, but the internal MDIO bus that is used to access it
> is actually an instantiation of drivers/net/phy/mdio-mscc-miim.c. But it
> would be difficult to reuse that driver (it doesn't even use regmap, and
> it's less than 200 lines of code), so we hand-roll here some internal
> MDIO bus accessors within seville_vsc9953.c, which serves the purpose of
> driving the PCS absolutely fine.
> Also, same as Felix, the PCS doesn't support dynamic reconfiguration of
> SerDes protocol, so we need to do pre-validation of PHY mode from device
> tree and not let phylink change it.
> Signed-off-by: Maxim Kochetkov <>
> Signed-off-by: Vladimir Oltean <>

Reviewed-by: Florian Fainelli <>

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