mmc: Disabler for Ricoh MMC controller

Thanks to Matt Domsch and Rezwanul Kabir at Dell, we know how to disable the
MMC controller on the multi-function Ricoh R5C832. The MMC controller needs
to be disabled or it will steal MMC cards from the SD controller where they
would otherwise be supported by the Linux SDHCI driver.

Signed-off-by: Philipl Langdale <philipl@overt.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 68fb052afd3e..5fef6783c716 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -35,6 +35,23 @@ config MMC_SDHCI
 
           If unsure, say N.
 
+config MMC_RICOH_MMC
+        tristate "Ricoh MMC Controller Disabler  (EXPERIMENTAL)"
+        depends on PCI && EXPERIMENTAL && MMC_SDHCI
+        help
+          This selects the disabler for the Ricoh MMC Controller. This
+          proprietary controller is unnecessary because the SDHCI driver
+          supports MMC cards on the SD controller, but if it is not
+          disabled, it will steal the MMC cards away - rendering them
+          useless. It is safe to select this driver even if you don't
+          have a Ricoh based card reader.
+
+
+          To compile this driver as a module, choose M here:
+          the module will be called ricoh_mmc.
+
+          If unsure, say Y.
+
 config MMC_OMAP
         tristate "TI OMAP Multimedia Card Interface support"
         depends on ARCH_OMAP