dt-bindings: misc: esm: Add ESM support for TI K3 devices

Document the binding for TI K3 ESM (Error Signaling Module) block.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230504080526.133149-2-n-francis@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/misc/ti,j721e-esm.yaml b/Documentation/devicetree/bindings/misc/ti,j721e-esm.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2022 Texas Instruments Incorporated
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/ti,j721e-esm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments K3 ESM
+
+maintainers:
+  - Neha Malcom Francis <n-francis@ti.com>
+
+description:
+  The ESM (Error Signaling Module) is an IP block on TI K3 devices
+  that allows handling of safety events somewhat similar to what interrupt
+  controller would do. The safety signals have their separate paths within
+  the SoC, and they are handled by the ESM, which routes them to the proper
+  destination, which can be system reset, interrupt controller, etc. In the
+  simplest configuration the signals are just routed to reset the SoC.
+
+properties:
+  compatible:
+    const: ti,j721e-esm
+
+  reg:
+    maxItems: 1
+
+  ti,esm-pins:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+      integer array of ESM interrupt pins to route to external event pin
+      which can be used to reset the SoC.
+    minItems: 1
+    maxItems: 255
+
+required:
+  - compatible
+  - reg
+  - ti,esm-pins
+
+additionalProperties: false
+
+examples:
+  - |
+    bus {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        esm@700000 {
+            compatible = "ti,j721e-esm";
+            reg = <0x0 0x700000 0x0 0x1000>;
+            ti,esm-pins = <344>, <345>;
+        };
+    };