linux-kernel - Re: [PATCH] net: stmmac: dwmac-sophgo: Add phy interface filter

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Message-ID: <hmch7csqotxt42snddksce2mpnjeglbgvoxs6r5qlu7v2ayxyk@zctj7xhugeln>
Date: Sat, 18 Oct 2025 08:43:47 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Yixun Lan <dlan@...too.org>, Inochi Amaoto <inochiama@...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>, 
	Chen Wang <unicorn_wang@...look.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, 
	Han Gao <rabenda.cn@...il.com>, Icenowy Zheng <uwu@...nowy.me>, 
	Vivian Wang <wangruikang@...as.ac.cn>, Yao Zi <ziyao@...root.org>, netdev@...r.kernel.org, 
	sophgo@...ts.linux.dev, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH] net: stmmac: dwmac-sophgo: Add phy interface filter

On Sat, Oct 18, 2025 at 08:05:48AM +0800, Yixun Lan wrote:
> Hi Inochi,
> 
> On 09:18 Fri 17 Oct     , Inochi Amaoto wrote:
> > As the SG2042 has an internal rx delay, the delay should be remove
>                                                      s/remove/removed/
> > when init the mac, otherwise the phy will be misconfigurated.
> s/init/initialize/
> > 
> > Fixes: 543009e2d4cd ("net: stmmac: dwmac-sophgo: Add support for Sophgo SG2042 SoC")
> > Signed-off-by: Inochi Amaoto <inochiama@...il.com>
> > Tested-by: Han Gao <rabenda.cn@...il.com>
> > ---
> >  .../ethernet/stmicro/stmmac/dwmac-sophgo.c    | 25 ++++++++++++++++++-
> >  1 file changed, 24 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
> > index 3b7947a7a7ba..b2dee1399eb0 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
> > @@ -7,6 +7,7 @@
> > 
> >  #include <linux/clk.h>
> >  #include <linux/module.h>
> > +#include <linux/property.h>
> >  #include <linux/mod_devicetable.h>
> >  #include <linux/platform_device.h>
> > 
> > @@ -29,8 +30,23 @@ static int sophgo_sg2044_dwmac_init(struct platform_device *pdev,
> >  	return 0;
> >  }
> > 
> > +static int sophgo_sg2042_set_mode(struct plat_stmmacenet_data *plat_dat)
> > +{
> > +	switch (plat_dat->phy_interface) {
> > +	case PHY_INTERFACE_MODE_RGMII_ID:
> > +		plat_dat->phy_interface = PHY_INTERFACE_MODE_RGMII_TXID;
> > +		return 0;
> > +	case PHY_INTERFACE_MODE_RGMII_RXID:
> > +		plat_dat->phy_interface = PHY_INTERFACE_MODE_RGMII;
> > +		return 0;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +
> >  static int sophgo_dwmac_probe(struct platform_device *pdev)
> >  {
> > +	int (*plat_set_mode)(struct plat_stmmacenet_data *plat_dat);
> >  	struct plat_stmmacenet_data *plat_dat;
> >  	struct stmmac_resources stmmac_res;
> >  	struct device *dev = &pdev->dev;
> > @@ -50,11 +66,18 @@ static int sophgo_dwmac_probe(struct platform_device *pdev)
> >  	if (ret)
> >  		return ret;
> > 
> > +	plat_set_mode = device_get_match_data(&pdev->dev);
> > +	if (plat_set_mode) {
> > +		ret = plat_set_mode(plat_dat);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> >  	return stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
> >  }
> > 

> >  static const struct of_device_id sophgo_dwmac_match[] = {
> > -	{ .compatible = "sophgo,sg2042-dwmac" },
> > +	{ .compatible = "sophgo,sg2042-dwmac", .data = sophgo_sg2042_set_mode },
> I'd personally prefer to introduce a flag for this, it would be more readable and
> maintainable, something like
> struct sophgo_dwmac_compitable_data {
> 	bool has_internal_rx_delay;
> }
> 
> then.
> 	if (data->has_internal_rx_delay)
> 		sophgo_sg2042_set_mode(..)
> 
> 
> >  	{ .compatible = "sophgo,sg2044-dwmac" },
> >  	{ /* sentinel */ }
> >  };

Yeah, I think this is a good idea, thanks.

Regards,
Inochi