dt-bindings: display: imx: Add i.MX8qxp Display Controller AXI performance counter

i.MX8qxp Display Controller contains a AXI performance counter which allows
measurement of average bandwidth and latency during operation.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250414035028.1561475-6-victor.liu@nxp.com

diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dc-axi-performance-counter.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qxp Display Controller AXI Performance Counter
+
+description: |
+  Performance counters are provided to allow measurement of average bandwidth
+  and latency during operation. The following features are supported:
+
+  * Manual and timer controlled measurement mode.
+
+  * Measurement counters:
+    - GLOBAL_COUNTER for overall measurement time
+    - BUSY_COUNTER for number of data bus busy cycles
+    - DATA_COUNTER for number of data transfer cycles
+    - TRANSFER_COUNTER for number of transfers
+    - ADDRBUSY_COUNTER for number of address bus busy cycles
+    - LATENCY_COUNTER for average latency
+
+  * Counter overflow detection.
+
+  * Outstanding Transfer Counters (OTC) which are used for latency measurement
+    have to run immediately after reset, but can be disabled by software when
+    there is no need for latency measurement.
+
+maintainers:
+  - Liu Ying <victor.liu@nxp.com>
+
+properties:
+  compatible:
+    const: fsl,imx8qxp-dc-axi-performance-counter
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-lpcg.h>
+
+    pmu@5618f000 {
+        compatible = "fsl,imx8qxp-dc-axi-performance-counter";
+        reg = <0x5618f000 0x90>;
+        clocks = <&dc0_lpcg IMX_LPCG_CLK_5>;
+    };