DDRPERFM is the DDR Performance Monitor embedded in STM32MPU SoC.
It allows to monitor DDR events that come from the DDR Controller
such as read or write events.

Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
---
 .../devicetree/bindings/perf/st,stm32-ddr-pmu.yaml | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml b/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml
new file mode 100644
index 000000000000..98775f32475a
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/perf/st,stm32-ddr-pmu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+maintainers:
+  - Clément Le Goffic <clement.legoffic@foss.st.com>
+
+title: STMicroelectronics STM32 DDR Performance Monitor (DDRPERFM)
+
+properties:
+  compatible:
+    oneOf:
+      enum:
+        - st,stm32mp131-ddr-pmu
+        - st,stm32mp151-ddr-pmu
+      const: st,stm32mp251-ddr-pmu
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  access-controllers:
+    minItems: 1
+    maxItems: 2
+
+  memory-channel:
+    description: |
+      The memory channel this DDRPERFM is attached to.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - st,stm32mp131-ddr-pmu
+              - st,stm32mp151-ddr-pmu
+    then:
+      required:
+        - clocks
+        - resets
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: st,stm32mp251-ddr-pmu
+    then:
+      required:
+        - access-controllers
+        - st,dram-type
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    #include <dt-bindings/reset/stm32mp1-resets.h>
+
+    perf@5a007000 {
+        compatible = "st,stm32mp151-ddr-pmu";
+        reg = <0x5a007000 0x400>;
+        clocks = <&rcc DDRPERFM>;
+        resets = <&rcc DDRPERFM_R>;
+    };
+
+  - |
+    ddr_channel: ddr4-channel@0 {
+        compatible = "jedec,ddr4-channel";
+        io-width = <32>;
+    };
+
+    perf@48041000 {
+      compatible = "st,stm32mp251-ddr-pmu";
+      reg = <0x48041000 0x400>;
+      access-controllers = <&rcc 104>;
+      memory-channel = <&ddr_channel>;
+    };

-- 
2.43.0

On Thu, 26 Jun 2025 21:48:35 +0200, Clément Le Goffic wrote:
> DDRPERFM is the DDR Performance Monitor embedded in STM32MPU SoC.
> It allows to monitor DDR events that come from the DDR Controller
> such as read or write events.
> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com>
> ---
>  .../devicetree/bindings/perf/st,stm32-ddr-pmu.yaml | 90 ++++++++++++++++++++++
>  1 file changed, 90 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml: ignoring, error in schema: properties: compatible: oneOf
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml: properties:compatible:oneOf: {'enum': ['st,stm32mp131-ddr-pmu', 'st,stm32mp151-ddr-pmu'], 'const': 'st,stm32mp251-ddr-pmu'} is not of type 'array'
	from schema $id: http://json-schema.org/draft-07/schema#
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml: properties:compatible:oneOf: {'enum': ['st,stm32mp131-ddr-pmu', 'st,stm32mp151-ddr-pmu'], 'const': 'st,stm32mp251-ddr-pmu'} should not be valid under {'items': {'propertyNames': {'const': 'const'}, 'required': ['const']}}
	hint: Use 'enum' rather than 'oneOf' + 'const' entries
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml: properties:compatible:oneOf: {'enum': ['st,stm32mp131-ddr-pmu', 'st,stm32mp151-ddr-pmu'], 'const': 'st,stm32mp251-ddr-pmu'} is not of type 'array'
	from schema $id: http://devicetree.org/meta-schemas/string-array.yaml#
Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.example.dts:44.37-47.11: Warning (unit_address_vs_reg): /example-1/ddr4-channel@0: node has a unit name, but no reg or ranges property
Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.example.dtb: /example-0/perf@5a007000: failed to match any schema with compatible: ['st,stm32mp151-ddr-pmu']
Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.example.dtb: /example-1/perf@48041000: failed to match any schema with compatible: ['st,stm32mp251-ddr-pmu']

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20250626-ddr-bindings-v1-2-cae30933c54c@foss.st.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.