netdev - Re: [PATCH net-next v2 2/3] net: stmmac: dwmac-renesas-gbeth: Use OF data for configuration

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Message-ID: <aLn7XVnWmHv1Bfe2@shell.armlinux.org.uk>
Date: Thu, 4 Sep 2025 21:49:33 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Richard Cochran <richardcochran@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next v2 2/3] net: stmmac: dwmac-renesas-gbeth: Use OF
 data for configuration

On Thu, Sep 04, 2025 at 09:39:48PM +0100, Prabhakar wrote:
>  	plat_dat->init = renesas_gbeth_init;
>  	plat_dat->exit = renesas_gbeth_exit;
> -	plat_dat->flags |= STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY |
> -			   STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP |
> -			   STMMAC_FLAG_SPH_DISABLE;
> +	plat_dat->flags |= gbeth->of_data->stmmac_flags;

You include the first two flags in your new device. I would like to see
at least STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP always being set. The only
reason we have the STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP flag is to avoid
changing existing behaviour and causing regressions. New stuff should
always set this.

If there is a reason not to have this set (e.g., PCS doesn't support
it) then we need to make that a PCS property and extend phylink's EEE
support. If there's something wrong in the setup that stmmac does for
EEE, then I'd like to hear about it as well.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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