mmc: USB SD Host Controller (USHC) driver
Add a driver for USB SD Host Controller devices. These devices are
Cypress Astoria chips with firmware compliant with issue 2 of CSR's USHC
specification.
[cjb: adapt to block layer deprecation of max_{hw,phys}_segs]
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 68d1279..8de7b9e 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -451,3 +451,17 @@
SoCs.
If you have a board based on such a SoC and with a SD/MMC slot,
say Y or M here.
+
+config MMC_USHC
+ tristate "USB SD Host Controller (USHC) support"
+ depends on USB
+ help
+ This selects support for USB SD Host Controllers based on
+ the Cypress Astoria chip with firmware compliant with CSR's
+ USB SD Host Controller specification (CS-118793-SP).
+
+ CSR boards with this device include: USB<>SDIO (M1985v2),
+ and Ultrasira.
+
+ Note: These controllers only support SDIO cards and do not
+ support MMC or SD memory cards.