dt-bindings: mmc: document alias support

As for I2C and SPI, it now is possible to reserve a fixed index for
mmc/mmcblk devices.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/20200901085004.2512-1-matthias.schiffer@ew.tq-group.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index b96da0c7f819df3de818d16f6921c19bbbe046ac..f928f66fc59a940f6bd4a321ae08c116472b90e8 100644 (file)
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -14,6 +14,10 @@ description: |
   that requires the respective functionality should implement them using
   these definitions.
 
+  It is possible to assign a fixed index mmcN to an MMC host controller
+  (and the corresponding mmcblkN devices) by defining an alias in the
+  /aliases device tree node.
+
 properties:
   $nodename:
     pattern: "^mmc(@.*)?$"