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From: Andrew Lunn <andrew@lunn.ch>
To: Madalin Bucur <madalin.bucur@nxp.com>
Cc: "Russell King" <linux@armlinux.org.uk>,
	"Pali Rohár" <pali@kernel.org>,
	"Igal Liberman" <Igal.Liberman@freescale.com>,
	"Shruti Kanetkar" <Shruti@freescale.com>,
	"Emil Medve" <Emilian.Medve@freescale.com>,
	"Scott Wood" <oss@buserror.net>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Camelia Alexandra Groza (OSS)" <camelia.groza@oss.nxp.com>
Subject: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts
Date: Fri, 4 Jun 2021 22:23:40 +0200	[thread overview]
Message-ID: <YLqLzOltcb6jan+B@lunn.ch> (raw)
In-Reply-To: <AM6PR04MB39768A569CE3CC4EC61A8769EC3B9@AM6PR04MB3976.eurprd04.prod.outlook.com>

> The "sgmii-2500" compatible in that device tree describes an SGMII HW
> block, overclocked at 2.5G. Without that overclocking, it's a plain
> Cisco (like) SGMII HW block. That's the reason you need to disable it's
> AN setting when overclocked. With the proper Reset Configuration Word,
> you could remove the overclocking and transform that into a plain "sgmii".
> Thus, the dts compatible describes the HW, as it is.

It sounds like the hardware is capable of swapping between SGMII and
2500BaseX.

What we have in DT in this case is not describing the hardware, but
how we configure the hardware. It is one of the few places we abuse DT
for configuration.

    Andrew

  parent reply	other threads:[~2021-06-04 20:24 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 14:34 Pali Rohár
2021-06-03 15:12 ` Andrew Lunn
2021-06-03 19:48   ` Pali Rohár
2021-06-04  7:35     ` Madalin Bucur
2021-06-04 17:32       ` Pali Rohár
2021-06-04 19:13         ` Madalin Bucur
2021-06-04 19:27       ` Russell King (Oracle)
2021-06-04 19:39         ` Madalin Bucur
2021-06-04 20:00           ` Russell King (Oracle)
2021-06-04 21:37             ` Madalin Bucur
2021-06-04 20:23           ` Andrew Lunn [this message]
2021-06-04 21:47             ` Madalin Bucur
2021-06-04 23:34               ` Pali Rohár
2021-06-05  0:33                 ` Russell King (Oracle)
2021-06-05 12:26                   ` Vladimir Oltean
2021-06-05 12:50                     ` What is inside GPON SFP module? (Was: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts) Pali Rohár
2021-06-05 13:04                       ` Hauke Mehrtens
2021-06-05 13:31                         ` What is inside GPON SFP module? Pali Rohár
2021-06-05 14:17                           ` Hauke Mehrtens
2021-06-05 14:41                         ` What is inside GPON SFP module? (Was: Re: Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts) Russell King (Oracle)
2021-06-08 10:33                           ` What is inside GPON SFP module? Pali Rohár
2021-06-19 20:35                 ` Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts Pali Rohár
2021-07-04 13:43                 ` [PATCH] powerpc/fsl/dts: Fix phy-connection-type for fm1mac3 Pali Rohár
2021-07-14 17:11                   ` Scott Wood
2021-08-27 11:38                     ` Pali Rohár
2021-09-28 21:39                       ` Pali Rohár
2021-09-29 14:25                         ` Andrew Lunn
2021-10-02  9:06                           ` Pali Rohár
2021-06-04 23:18         ` Unsupported phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts Pali Rohár

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