[RFC PATCH] dt-bindings: mfd: Add Renesas R2A11302FT PMIC

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

Internal RFC for now.

Basic binding description for the above PMIC already referenced in
upstream DTs for the Renesas Lager and Koelsch boards.

Do you think we could / should upstream it? Passes dt_binding_check and
dtbs_check.

Fixes:
arch/arm/boot/dts/renesas/r8a7790-lager.dtb: /soc/spi@e6e10000/pmic@0: failed to match any schema with compatible: ['renesas,r2a11302ft']
arch/arm/boot/dts/renesas/r8a7791-koelsch.dtb: /soc/spi@e6e20000/pmic@0: failed to match any schema with compatible: ['renesas,r2a11302ft']

Notes:

Would have loved to add this to 'trivial-devices' but 'spi-cpol' and
'spi-cpha' are not allowed there.

There is no driver and there will likely never be one.

I don't have and couldn't find any datasheet.

Maybe Geert wants to be listed as maintainer? He is the only one who
ever playes with this device. All is fine with me...

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 .../bindings/mfd/renesas,r2a11302ft.yaml      | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/renesas,r2a11302ft.yaml

diff --git a/Documentation/devicetree/bindings/mfd/renesas,r2a11302ft.yaml b/Documentation/devicetree/bindings/mfd/renesas,r2a11302ft.yaml
new file mode 100644
index 000000000000..fc94f26f2bcd
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/renesas,r2a11302ft.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/renesas,r2a11302ft.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas R2A11302FT Power Supply ICs for R-Car
+
+maintainers:
+  - Wolfram Sang <wsa+renesas@sang-engineering.com>
+
+properties:
+  compatible:
+    const: renesas,r2a11302ft
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 6000000
+
+  spi-cpol: true
+
+  spi-cpha: true
+
+required:
+  - compatible
+  - reg
+  - spi-cpol
+  - spi-cpha
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pmic: pmic@0 {
+                compatible = "renesas,r2a11302ft";
+                reg = <0>;
+                spi-max-frequency = <6000000>;
+                spi-cpol;
+                spi-cpha;
+        };
+    };
+...
-- 
2.47.2