[PATCHv6 1/6] dt-bindings: mmc: synopsys-dw-mshc: document "altr,sysmgr-syscon"

[Dinh Nguyen <dinguyen@kernel.org>]

Document the optional "altr,sysmgr-syscon" binding that is used to
access the System Manager register that controls the SDMMC clock
phase.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
---
v6: make "altr,sysmgr-syscon" optional
v5: document reg shift
v4: add else statement
v3: document that the "altr,sysmgr-syscon" binding is only applicable to
    "altr,socfpga-dw-mshc"
v2: document "altr,sysmgr-syscon" in the MMC section
---
 .../bindings/mmc/synopsys-dw-mshc.yaml        | 23 ++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
index ae6d6fca79e2..0e2024eb9018 100644
--- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
+++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
@@ -6,9 +6,6 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Synopsys Designware Mobile Storage Host Controller Binding
 
-allOf:
-  - $ref: "synopsys-dw-mshc-common.yaml#"
-
 maintainers:
   - Ulf Hansson <ulf.hansson@linaro.org>
 
@@ -38,6 +35,26 @@ properties:
       - const: biu
       - const: ciu
 
+allOf:
+  - $ref: synopsys-dw-mshc-common.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: altr,socfpga-dw-mshc
+    then:
+      properties:
+        altr,sysmgr-syscon:
+          $ref: /schemas/types.yaml#/definitions/phandle-array
+          items:
+            - description: phandle to the sysmgr node
+            - description: register offset that controls the SDMMC clock phase
+            - description: register shift for the smplsel(drive in) setting
+    else:
+      properties:
+        altr,sysmgr-syscon: false
+
 required:
   - compatible
   - reg
-- 
2.25.1