[PATCH v3 1/2] dt-bindings: mmc: Add power-off-delay-us property

Add power-off-delay-us property to MMC controller common.

This property shall be used to specify value of delay after
deasserting power during MMC power cycles. Default for delay
is 1000us but custom delay can be passed in to work around
hardware issues such as slow RC discharge on MMC VDD rails.

Signed-off-by: Judith Mendez <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
---
Changes since v2:
- Make minimum 0 instead of 1 (for no delay, early return)
- Add Rob's review tag
---
 .../devicetree/bindings/mmc/mmc-controller-common.yaml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
index 3d7195e9461c3..8b9b3b0361296 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
@@ -275,6 +275,16 @@ properties:
       not available.
     default: 10
 
+  power-off-delay-us:
+    description:
+      Delay in microseconds after card power is deasserted during a power
+      cycle to allow time for proper power discharge. Larger values can be
+      configured to work around hardware issues such as slow RC discharge
+      on MMC VDD rails.
+    minimum: 0
+    maximum: 10000000
+    default: 1000
+
   supports-cqe:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.54.0