netdev - [PATCH 7/11] ibm_newemac: Skip EMACs that are marked unused by the firmware

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Message-Id: <20071205001539.97730DE091@ozlabs.org>
Date:	Wed, 05 Dec 2007 11:14:30 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	<jgarzik@...ox.com>
CC:	<netdev@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
Subject: [PATCH 7/11] ibm_newemac: Skip EMACs that are marked unused by the firmware

From: Hugh Blemings <hugh@...mings.org>

Depending on how the 44x processors are wired, some EMAC cells
might not be useable (and not connected to a PHY). However, some
device-trees may choose to still expose them (since their registers
are present in the MMIO space) but with an "unused" property in them.

Signed-off-by: Hugh Blemings <hugh@...mings.org>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---

 drivers/net/ibm_newemac/core.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-work/drivers/net/ibm_newemac/core.c
===================================================================
--- linux-work.orig/drivers/net/ibm_newemac/core.c	2007-11-20 14:47:02.000000000 +1100
+++ linux-work/drivers/net/ibm_newemac/core.c	2007-11-20 14:47:05.000000000 +1100
@@ -2550,6 +2550,10 @@ static int __devinit emac_probe(struct o
 	struct device_node **blist = NULL;
 	int err, i;
 
+	/* Skip unused/unwired EMACS */
+	if (of_get_property(np, "unused", NULL))
+		return -ENODEV;
+
 	/* Find ourselves in the bootlist if we are there */
 	for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
 		if (emac_boot_list[i] == np)
--
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