From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Wed, 24 Sep 2014 11:36:16 +0200 Subject: [PATCHv4 3/6] ARM: dts: Add initial LS1021A TWR board dts support In-Reply-To: References: <1411371952-5618-1-git-send-email-jingchang.lu@freescale.com> <3321146.kBfn28qbNM@wuerfel> Message-ID: <4264466.HtkUxyxBW8@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 24 September 2014 05:47:53 Jingchang Lu wrote: > > The ethernet device nodes already have the phy-handle properties to their mdio nodes. > > The alias for PHY nodes here is: > The ethernet has two kind of PHY interface, one is SGMII, and the other is RGMII, > The selection is done by the reset configuration word(RCW), so Phy-handle properties > should be change properly to reflecting the PHY interface selection. This is done > by fixing up dtb in u-boot before booting the kernel. Thus the alias for PHY nodes > is added here for fdt finding the PHY nodes easily. Ok, I see. I thought that this was what the labels in the dtb were supposed to be used for. Can't you do the same thing in u-boot by using a label as opposed to the alias? IIRC you should be able to add an additional label like +&mdio0 { + enet1_sgmii_phy: sgmii_phy0: ethernet-phy at 0 { + reg = <0x0>; + }; and then use libfdt to find the node through that, rather than through the alias. I don't know how things are handled on other platforms, but I think that was how it was initially thought up when we introduced the fdt format on PowerPC. Arnd