[PATCH v8 06/17] dt-bindings: mfd: amd,pensando-elbasr: Add AMD Pensando Elba System Resource chip

[Brad Larson <brad@pensando.io>]

Add support for the AMD Pensando Elba SoC System Resource chip
using the SPI interface.

Signed-off-by: Brad Larson <blarson@amd.com>
---

v8:
 - Apply review request changes and picked the two unique examples
   for the 4 chip-selects as one has the reset control support and
   the other an interrupt.  Missed the --in-reply-to in git
   send-email for v7, included in this update.

v7:
 - Use system-controller for the device with four chip-selects
   connected over spi.
 - Delete child by moving reset-controller into the parent.
 - Updated and used dtschema-2022.11 and yamllint-1.28.0

v6:
 - Expand description, rename nodes and change compatible usage

v5:
 - Change to AMD Pensando instead of Pensando

v4:
 - Change Maintained to Supported

 .../bindings/mfd/amd,pensando-elbasr.yaml     | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml

diff --git a/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml b/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml
new file mode 100644
index 000000000000..622c93402a86
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/amd,pensando-elbasr.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/amd,pensando-elbasr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AMD Pensando Elba SoC Resource Controller
+
+description: |
+  AMD Pensando Elba SoC Resource Controller functions are
+  accessed with four chip-selects.  Reset control is on CS0.
+
+maintainers:
+  - Brad Larson <blarson@amd.com>
+
+properties:
+  compatible:
+    enum:
+      - amd,pensando-elbasr
+
+  "#reset-cells":
+    const: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        num-cs = <4>;
+
+        system-controller@0 {
+            compatible = "amd,pensando-elbasr";
+            reg = <0>;
+            spi-max-frequency = <12000000>;
+            #reset-cells = <1>;
+        };
+
+        system-controller@2 {
+            compatible = "amd,pensando-elbasr";
+            reg = <2>;
+            spi-max-frequency = <12000000>;
+            interrupt-parent = <&porta>;
+            interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };
-- 
2.17.1