linux-kernel - Re: [PATCH net-next v4 2/4] net: ethernet: altera-tse: Convert to mdio-regmap and use PCS Lynx

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Date:   Mon, 5 Jun 2023 15:15:14 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Mark Brown <broonie@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexis.lothore@...tlin.com, thomas.petazzoni@...tlin.com,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net-next v4 2/4] net: ethernet: altera-tse: Convert to
 mdio-regmap and use PCS Lynx

Hi,

On Thu,  1 Jun 2023 16:14:52 +0200
Maxime Chevallier <maxime.chevallier@...tlin.com> wrote:

> The newly introduced regmap-based MDIO driver allows for an easy mapping
> of an mdiodevice onto the memory-mapped TSE PCS, which is actually a
> Lynx PCS.
> 
> Convert Altera TSE to use this PCS instead of the pcs-altera-tse, which
> is nothing more than a memory-mapped Lynx PCS.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
[ ... ]

> -	ret = request_and_map(pdev, "pcs", &pcs_res,
> -			      &priv->pcs_base);
> +	ret = request_and_map(pdev, "pcs", &pcs_res, &priv->pcs_base);

It turns out I'm missing the zeroing of pcs_regmap_cfg, which can trigger
errors at probe time. I know this series has been applied, and that I can
send a followup fix, but due to the missing regmap patch in the net-next
tree, this series will break altera_tse and dwmac_socfpga anyway,as
mentionned here (and in the cover):

https://lore.kernel.org/netdev/20230605142039.3f8d1530@pc-7.home/

Is reverting the way to go then ?

Best regards,

Maxime