[MMC] sdhci: support controller specific quirks

As some specific controllers will have bugs, we need a way to map special
behaviour to certain hardware.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index 8111fa3..f245334 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -204,6 +204,8 @@
 struct sdhci_chip {
 	struct pci_dev		*pdev;
 
+	unsigned long		quirks;
+
 	int			num_slots;	/* Slots on controller */
 	struct sdhci_host	*hosts[0];	/* Pointers to hosts */
 };