linux-kernel - Re: [PATCH net-next v5 3/3] net: stmmac: Add glue layer for Sophgo SG2044 SoC

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Message-ID: <5e481b95-3cf8-4f71-a76b-939d96e1c4f3@lunn.ch>
Date: Sun, 16 Feb 2025 18:07:05 +0100
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Inochi Amaoto <inochiama@...il.com>,
	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>,
	Chen Wang <unicorn_wang@...look.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Richard Cochran <richardcochran@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Jan Petrous (OSS)" <jan.petrous@....nxp.com>,
	Hariprasad Kelam <hkelam@...vell.com>,
	Clément Léger <clement.leger@...tlin.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	Emil Renner Berthing <emil.renner.berthing@...onical.com>,
	Drew Fustini <dfustini@...storrent.com>,
	Furong Xu <0x1207@...il.com>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Joe Hattori <joe@...is.s.u-tokyo.ac.jp>,
	Serge Semin <fancer.lancer@...il.com>,
	Lothar Rubusch <l.rubusch@...il.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	sophgo@...ts.linux.dev, linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, Yixun Lan <dlan@...too.org>,
	Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH net-next v5 3/3] net: stmmac: Add glue layer for Sophgo
 SG2044 SoC

On Sun, Feb 16, 2025 at 03:47:18PM +0000, Russell King (Oracle) wrote:
> On Sun, Feb 16, 2025 at 08:39:51PM +0800, Inochi Amaoto wrote:
> > +static void sophgo_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
> > +{
> > +	struct sophgo_dwmac *dwmac = priv;
> > +	long rate;
> > +	int ret;
> > +
> > +	rate = rgmii_clock(speed);
> > +	if (rate < 0) {
> > +		dev_err(dwmac->dev, "invalid speed %u\n", speed);
> > +		return;
> > +	}
> > +
> > +	ret = clk_set_rate(dwmac->clk_tx, rate);
> > +	if (ret)
> > +		dev_err(dwmac->dev, "failed to set tx rate %ld: %pe\n",
> > +			rate, ERR_PTR(ret));
> > +}
> 
> There are a bunch of other platform support in stmmac that are doing
> the same:
> 
> dwmac-s32.c is virtually identical
> dwmac-imx.c does the same, although has some pre-conditions
> dwmac-dwc-qos-eth.c is virually identical but the two steps are split
>   across a bunch of register writes
> dwmac-starfive.c looks the same
> dwmac-rk.c also
> dwmac-intel-plat.c also
> 
> So, I wonder whether either this should be a helper, or whether core
> code should be doing this. Maybe something to look at as a part of
> this patch submission?

Inochi, please could you look at the datasheet for this IP. Is the
transmit clock a part of the IP? Can we expect all devices integrating
this IP to have such a clock? That would be a good indicator the clock
handling should be moved into the core.

	Andrew