[PATCH v4 1/3] dt-bindings: mmc: synopsys-dw-mshc: relax clocks constraint

["ping.gao" <ping.gao@samsung.com>]

From: Ping Gao <ping.gao@samsung.com>

In some SoC designs (e.g., certain Samsung Exynos platforms), the Bus
Interface Unit (BIU) and Card Interface Unit (CIU) clocks are tied
together or driven by a single clock source. In such hardware
configurations, only one clock entry needs to be described in the
device tree.

Relax the clocks and clock-names constraints to allow a single clock
while maintaining backward compatibility for existing dual-clock
designs.

Signed-off-by: Ping Gao <ping.gao@samsung.com>
---
 .../devicetree/bindings/mmc/synopsys-dw-mshc.yaml   | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
index a6292777e376..47dff8d4be27 100644
--- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
+++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
@@ -24,16 +24,21 @@ properties:
     maxItems: 1
 
   clocks:
-    minItems: 2
+    minItems: 1
     maxItems: 2
     description:
       Handle to "biu" and "ciu" clocks for the
       bus interface unit clock and the card interface unit clock.
 
   clock-names:
-    items:
-      - const: biu
-      - const: ciu
+    minItems: 1
+    maxItems: 2
+    oneOf:
+      - items:
+          - const: biu
+          - const: ciu
+      - items:
+          - const: ciu
 
   iommus:
     maxItems: 1
-- 
2.50.1