diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 3e7615e..338a9b3 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -51,6 +51,35 @@
 };
 
 struct mmc_host_ops {
+	/*
+	 * Hosts that support power saving can use the 'enable' and 'disable'
+	 * methods to exit and enter power saving states. 'enable' is called
+	 * when the host is claimed and 'disable' is called (or scheduled with
+	 * a delay) when the host is released. The 'disable' is scheduled if
+	 * the disable delay set by 'mmc_set_disable_delay()' is non-zero,
+	 * otherwise 'disable' is called immediately. 'disable' may be
+	 * scheduled repeatedly, to permit ever greater power saving at the
+	 * expense of ever greater latency to re-enable. Rescheduling is
+	 * determined by the return value of the 'disable' method. A positive
+	 * value gives the delay in milliseconds.
+	 *
+	 * In the case where a host function (like set_ios) may be called
+	 * with or without the host claimed, enabling and disabling can be
+	 * done directly and will nest correctly. Call 'mmc_host_enable()' and
+	 * 'mmc_host_lazy_disable()' for this purpose, but note that these
+	 * functions must be paired.
+	 *
+	 * Alternatively, 'mmc_host_enable()' may be paired with
+	 * 'mmc_host_disable()' which calls 'disable' immediately.  In this
+	 * case the 'disable' method will be called with 'lazy' set to 0.
+	 * This is mainly useful for error paths.
+	 *
+	 * Because lazy disable may be called from a work queue, the 'disable'
+	 * method must claim the host when 'lazy' != 0, which will work
+	 * correctly because recursion is detected and handled.
+	 */
+	int (*enable)(struct mmc_host *host);
+	int (*disable)(struct mmc_host *host, int lazy);
 	void	(*request)(struct mmc_host *host, struct mmc_request *req);
 	/*
 	 * Avoid calling these three functions too often or in a "fast path",
@@ -118,6 +147,7 @@
 #define MMC_CAP_SPI		(1 << 4)	/* Talks only SPI protocols */
 #define MMC_CAP_NEEDS_POLL	(1 << 5)	/* Needs polling for card-detection */
 #define MMC_CAP_8_BIT_DATA	(1 << 6)	/* Can the host do 8 bit transfers */
+#define MMC_CAP_DISABLE		(1 << 7)	/* Can the host be disabled */
 
 	/* host specific block data */
 	unsigned int		max_seg_size;	/* see blk_queue_max_segment_size */
@@ -142,6 +172,13 @@
 	unsigned int		removed:1;	/* host is being removed */
 #endif
 
+	/* Only used with MMC_CAP_DISABLE */
+	int			enabled;	/* host is enabled */
+	int			nesting_cnt;	/* "enable" nesting count */
+	int			en_dis_recurs;	/* detect recursion */
+	unsigned int		disable_delay;	/* disable delay in msecs */
+	struct delayed_work	disable;	/* disabling work */
+
 	struct mmc_card		*card;		/* device attached to this host */
 
 	wait_queue_head_t	wq;
@@ -197,5 +234,15 @@
 int mmc_regulator_get_ocrmask(struct regulator *supply);
 int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit);
 
+int mmc_host_enable(struct mmc_host *host);
+int mmc_host_disable(struct mmc_host *host);
+int mmc_host_lazy_disable(struct mmc_host *host);
+
+static inline void mmc_set_disable_delay(struct mmc_host *host,
+					 unsigned int disable_delay)
+{
+	host->disable_delay = disable_delay;
+}
+
 #endif