linux-kernel - Re: [net-next PATCH v8 3/4] net: phy: aquantia: add firmware load support

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Message-ID: <94a68354-1956-49dd-9fb6-edb3fefaf5d7@lunn.ch>
Date:   Tue, 14 Nov 2023 23:18:27 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Robert Marko <robimarko@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v8 3/4] net: phy: aquantia: add firmware load
 support

On Tue, Nov 14, 2023 at 03:08:43PM +0100, Christian Marangi wrote:
> From: Robert Marko <robimarko@...il.com>
> 
> Aquantia PHY-s require firmware to be loaded before they start operating.
> It can be automatically loaded in case when there is a SPI-NOR connected
> to Aquantia PHY-s or can be loaded from the host via MDIO.
> 
> This patch adds support for loading the firmware via MDIO as in most cases
> there is no SPI-NOR being used to save on cost.
> Firmware loading code itself is ported from mainline U-boot with cleanups.
> 
> The firmware has mixed values both in big and little endian.
> PHY core itself is big-endian but it expects values to be in little-endian.
> The firmware is little-endian but CRC-16 value for it is stored at the end
> of firmware in big-endian.
> 
> It seems the PHY does the conversion internally from firmware that is
> little-endian to the PHY that is big-endian on using the mailbox
> but mailbox returns a big-endian CRC-16 to verify the written data
> integrity.
> 
> Co-developed-by: Christian Marangi <ansuelsmth@...il.com>
> Signed-off-by: Robert Marko <robimarko@...il.com>
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

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

    Andrew