[PATCH v4 1/6] dt-bindings: mfd: add NVIDIA VRS PSEQ

[Shubhi Garg]

Add support for NVIDIA VRS (Voltage Regulator Specification) power
sequencer device. NVIDIA VRS PSEQ provides 32kHz RTC support with backup
battery for system timing. It controls ON/OFF and suspend/resume power
sequencing of system power rails on below NVIDIA platforms:

- NVIDIA Jetson AGX Orin Developer Kit
- NVIDIA IGX Orin Development Kit
- NVIDIA Jetson Orin NX Developer Kit
- NVIDIA Jetson Orin Nano Developer Kit

Signed-off-by: Shubhi Garg <shgarg at nvidia.com>
---

v4:
- no changes

v3:
- fixed device tree node name to generic "pmic at 3c"
- fixed indentation

v2:
- fixed copyrights
- updated description with RTC information
- added status node in dtb node example

 .../bindings/mfd/nvidia,vrs-pseq.yaml         | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/nvidia,vrs-pseq.yaml

diff --git a/Documentation/devicetree/bindings/mfd/nvidia,vrs-pseq.yaml b/Documentation/devicetree/bindings/mfd/nvidia,vrs-pseq.yaml
new file mode 100644
index 000000000000..65bf77f70c44
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/nvidia,vrs-pseq.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/nvidia,vrs-pseq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Voltage Regulator Specification Power Sequencer
+
+maintainers:
+  - Shubhi Garg <shgarg at nvidia.com>
+
+description:
+  NVIDIA Voltage Regulator Specification Power Sequencer device controls
+  ON/OFF and suspend/resume power sequencing of system power rails for NVIDIA
+  SoCs. It provides 32kHz RTC clock support with backup battery for system
+  timing. The device also acts as an interrupt controller for managing
+  interrupts from the VRS power sequencer.
+
+properties:
+  compatible:
+    const: nvidia,vrs-pseq
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 2
+    description:
+      The first cell is the IRQ number, the second cell is the trigger type.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pmic at 3c {
+            compatible = "nvidia,vrs-pseq";
+            reg = <0x3c>;
+            interrupt-parent = <&pmc>;
+            interrupts = <24 IRQ_TYPE_LEVEL_LOW>;
+            interrupt-controller;
+            #interrupt-cells = <2>;
+        };
+    };
-- 
2.43.0