[PATCH v3 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

[Prabhakar <prabhakar.csengg@gmail.com>]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
of the R-Car Gen3, but it has some differences:
- HS400 is not supported.
- It supports the SD_IOVS bit to control the IO voltage level.
- It supports fixed address mode.

To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
compatible string is added.

A 'vqmmc-regulator' object is introduced to handle the power enable (PWEN)
and voltage level switching for the SD/MMC.

Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
to indicate that an internal regulator is used instead of a
GPIO-controlled regulator. This flag will help configure the internal
regulator and avoid special handling when GPIO is used for voltage
regulation instead of the SD_(IOVS/PWEN) pins.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2->v3
- Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
- Added regulator-compatible property for vqmmc-regulator
- Added 'renesas,sdhi-use-internal-regulator' property

v1->v2
- Moved vqmmc object in the if block
- Updated commit message
---
 .../devicetree/bindings/mmc/renesas,sdhi.yaml | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
index 3d0e61e59856..20769434a422 100644
--- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
+++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
@@ -18,6 +18,7 @@ properties:
           - renesas,sdhi-r7s9210 # SH-Mobile AG5
           - renesas,sdhi-r8a73a4 # R-Mobile APE6
           - renesas,sdhi-r8a7740 # R-Mobile A1
+          - renesas,sdhi-r9a09g057 # RZ/V2H(P)
           - renesas,sdhi-sh73a0  # R-Mobile APE6
       - items:
           - enum:
@@ -118,7 +119,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: renesas,rzg2l-sdhi
+            enum:
+              - renesas,sdhi-r9a09g057
+              - renesas,rzg2l-sdhi
     then:
       properties:
         clocks:
@@ -204,6 +207,31 @@ allOf:
         sectioned off to be run by a separate second clock source to allow
         the main core clock to be turned off to save power.
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,sdhi-r9a09g057
+    then:
+      properties:
+        renesas,sdhi-use-internal-regulator:
+          $ref: /schemas/types.yaml#/definitions/flag
+          description:
+            Flag to indicate internal regulator is being used instead of GPIO regulator.
+
+        vqmmc-regulator:
+          type: object
+          description: VQMMC SD regulator
+          $ref: /schemas/regulator/regulator.yaml#
+          unevaluatedProperties: false
+
+          properties:
+            regulator-compatible:
+              pattern: "^vqmmc-r9a09g057-regulator"
+
+      required:
+        - vqmmc-regulator
+
 required:
   - compatible
   - reg
-- 
2.34.1