netdev - Re: [EXT] Re: [PATCH] net: stmmac: dwmac-imx: pause the TXC clock in fixed-link

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Message-ID: <ea1a6423-64ff-426e-888c-0fb92c86581a@lunn.ch>
Date: Wed, 26 Jul 2023 20:30:57 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Shawn Guo <shawnguo@...nel.org>, dl-linux-imx <linux-imx@....com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-stm32@...md-mailman.stormreply.com" <linux-stm32@...md-mailman.stormreply.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	Frank Li <frank.li@....com>
Subject: Re: [EXT] Re: [PATCH] net: stmmac: dwmac-imx: pause the TXC clock in
 fixed-link

> > > +&eqos {
> > > +       pinctrl-names = "default";
> > > +       pinctrl-0 = <&pinctrl_eqos_rgmii>;
> > > +       phy-mode = "rgmii-rxid";
> > > +       phy-handle = <&fixed0>;
> > > +       status = "okay";
> > > +
> > > +       fixed0: fixed-link {
> > > +               speed = <1000>;
> > > +               full-duplex;
> > > +       };
> >
> > This is just totally botched up.
> >
> > "fixed0" is _not_ a PHY, therefore you should NOT be referencing it in phy-
> > handle. Please see the DT binding document:
> >
> 
> If there is a hidden rule here, it should be added to the CHECK_DTBS schema target.
> That way, users would get a warning or syntax error when running the tools, reminding
> them to follow the undisclosed rule.

I've no idea how to actually express that in yaml. phy-handle is just
a pointer to another node. There is no type associated to it, so i
don't see how we can say it needs to point to a node within an MDIO
bus. I wounder if it is possible to do a pattern match on the name of
the reference? It probably should match "*phy*".

    Andrew