From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Schocher Subject: powerpc, fs_enet: scanning PHY after Linux is up Date: Mon, 04 Oct 2010 09:32:26 +0200 Message-ID: <4CA9830A.2030605@denx.de> Reply-To: hs@denx.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7BIT Cc: devicetree-discuss@lists.ozlabs.org, Holger Brunck , Detlev Zundel , netdev@vger.kernel.org To: linuxppc-dev@ozlabs.org Return-path: Received: from a.relay.invitel.net ([62.77.203.3]:43880 "EHLO a.relay.invitel.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753174Ab0JDHmQ (ORCPT ); Mon, 4 Oct 2010 03:42:16 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hello all, we have on the mgcoge arch/powerpc/boot/dts/mgcoge.dts 3 fs_enet devices. The first is accessible on boot, and so get correct probed and works fine. For the other two fs_enet devices the PHYs are on startup in reset, and gets later, through userapplikations, out of reset ... so, on bootup, this 2 fs_enet devices could not detect the PHY in drivers/of/of_mdio.c of_mdiobus_register(), and if we want to use them later, we get for example: -bash-3.2# ifconfig eth2 172.31.31.33 net eth2: Could not attach to PHY SIOCSIFFLAGS: No such device So the problem is, that we cannot rescan the PHYs, if they are accessible. Also we could not load the fs_enet driver as a module, because the first port is used fix. So, first question which comes in my mind, is: Is detecting the phy in drivers/of/of_mdio.c of_mdiobus_register() the right place, or should it not better be done, when really using the port? But we found another way to solve this issue: After the PHYs are out of reset, we just have to rescan the PHYs with (for example PHY with addr 1) err = mdiobus_scan(bus, 1); and of_find_node_by_path("/soc@f0000000/cpm@119c0/mdio@10d40/ethernet-phy@1"); of_node_get(np); dev_archdata_set_node(&err->dev.archdata, np); but thats just a hack ... So, the question is, is there a possibility to solve this problem? If there is no standard option, what would be with adding a "scan_phy" file in /proc/device-tree/soc\@f0000000/cpm\@119c0/mdio\@10d40 (or better destination?) which with we could rescan a PHY with "echo addr > /proc/device-tree/soc\@f0000000/cpm\@119c0/mdio\@10d40/scan_phy" (so there is no need for using of_find_node_by_path(), as we should have the associated device node here, and can step through the child nodes with "for_each_child_of_node(np, child)" and check if reg == addr) or shouldn;t be at least, if the phy couldn;t be found when opening the port, retrigger a scanning, if the phy now is accessible? bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany