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-rw-r--r--Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
index 18e33cbe7eec..49ed3ad2524a 100644
--- a/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
+++ b/Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
@@ -32,6 +32,10 @@ Optional Properties:
probing, low speeds or in case where all phases work at tuning time.
If not specified 0 deg will be used.
+* rockchip,desired-num-phases: The desired number of times that the host
+ execute tuning when needed. If not specified, the host will do tuning
+ for 360 times, namely tuning for each degree.
+
Example:
rkdwmmc0@12200000 {