[PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

[Inochi Amaoto]

On Tue, Oct 22, 2024 at 03:51:08PM +0200, Andrew Lunn wrote:
> On Tue, Oct 22, 2024 at 06:21:49PM +0800, Inochi Amaoto wrote:
> > On Mon, Oct 21, 2024 at 03:27:18PM +0200, Andrew Lunn wrote:
> > > > It is related to the RGMII delay. On sg2044, when the phy 
> > > > sets rx-delay, the interal mac is not set the same delay, 
> > > > so this is needed to be set.
> > > 
> > > This is the wrong way to do it. Please look at how phy-mode should be
> > > used, the four different "rgmii" values. Nearly everybody gets this
> > > wrong, so there are plenty of emails from me in the netdev list about
> > > how it should be done.
> > > 
> > 
> > The phy-mode is alreay set to the "rgmii-id" and a rx delay is already
> > set (a default tx delay is set by the phy driver). In the scenario 
> > the extra bit is used to fix 2ns difference between the sampling clock
> > and data. It is more like an extra setting and the kernel can not handle
> > it by only setting the phy-mode.
> 
> This sounds wrong.
> 
> So in DT you have rgmii-id? You say the PHY is doing TX delay. So you
> pass PHY_INTERFACE_MODE_RGMII_TXID to the PHY? It is not clear from
> this patch, i don't see any code mentioning
> PHY_INTERFACE_MODE_RGMII_TXID. Could you point me at that code.
> 
> 	Andrew

The phy on the board I have is YT8531, The config code is here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/phy/motorcomm.c#n868

As the syscon only has a config on rx delay. I have
already fix the code and only set the bit when the
mac is rgmii-rxid/id.

Regards,
Inochi.