dt-bindings: mmc: sdhci: document sdhci-caps and sdhci-caps-mask

The Linux SDHCI driver core reads 'sdhci-caps' and 'sdhci-caps-mask'
properties and few devices already use it (e.g. Qualcomm SM8450), so add
them to a shared SDHCI bindings.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

Documentation/devicetree/bindings/mmc/sdhci-am654.yaml

···
   - Ulf Hansson <[e-mail]>
 
 allOf:
-  - $ref: mmc-controller.yaml#
+  - $ref: sdhci-common.yaml#
 
 properties:
   compatible:
···
     items:
       - const: clk_ahb
       - const: clk_xin
-
-  sdhci-caps-mask: true
 
   dma-coherent:
     type: boolean

Documentation/devicetree/bindings/mmc/sdhci-common.yaml

···
+# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/sdhci-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SDHCI Controller Common Properties
+
+maintainers:
+  - Adrian Hunter <[e-mail]>
+
+description:
+  Common properties present on Secure Digital Host Controller Interface (SDHCI)
+  devices.
+
+properties:
+  sdhci-caps:
+    $ref: /schemas/types.yaml#/definitions/uint64
+    description:
+      Additionally present SDHCI capabilities - values for SDHCI_CAPABILITIES
+      and SDHCI_CAPABILITIES_1 registers.
+
+  sdhci-caps-mask:
+    $ref: /schemas/types.yaml#/definitions/uint64
+    description:
+      Masked SDHCI capabilities to remove from SDHCI_CAPABILITIES and
+      SDHCI_CAPABILITIES_1 registers.
+
+allOf:
+  - $ref: mmc-controller.yaml#
+
+additionalProperties: true

Documentation/devicetree/bindings/mmc/sdhci-msm.yaml

···
   - interrupts
 
 allOf:
-  - $ref: mmc-controller.yaml#
+  - $ref: sdhci-common.yaml#
 
   - if:
       properties:

MAINTAINERS

···
 M:	Adrian Hunter <[e-mail]>
 L:	[e-mail]
 S:	Supported
+F:	Documentation/devicetree/bindings/mmc/sdhci-common.yaml
 F:	drivers/mmc/host/sdhci*
 
 SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) MICROCHIP DRIVER