[PATCH 2/3] mmc: host: add kdoc for mmc_retune_{en|dis}able

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

I wanted to use it in a wrong way, so document the intended way.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/mmc/core/host.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index eda4a1892c33..0f084c9b2684 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -95,6 +95,10 @@ void mmc_unregister_host_class(void)
 	class_unregister(&mmc_host_class);
 }
 
+/**
+ * mmc_retune_enable() - enter a transfer mode that requires retuning
+ * @host: host which should retune now
+ */
 void mmc_retune_enable(struct mmc_host *host)
 {
 	host->can_retune = 1;
@@ -126,6 +130,12 @@ void mmc_retune_unpause(struct mmc_host *host)
 }
 EXPORT_SYMBOL(mmc_retune_unpause);
 
+/**
+ * mmc_retune_disable() - exit a transfer mode that requires retuning
+ * @host: host which should not retune anymore
+ *
+ * It is not meant for temporarily preventing retuning!
+ */
 void mmc_retune_disable(struct mmc_host *host)
 {
 	mmc_retune_unpause(host);
-- 
2.30.2