[PATCH v3 11/19] dt-bindings: perf: stm32: introduce DDRPERFM dt-bindings
From: Clément Le Goffic <hidden>
Date: 2025-07-22 14:07:01
Also in:
linux-clk, linux-devicetree, linux-doc, linux-perf-users, lkml
Subsystem:
arm pmu profiling and debugging, open firmware and flattened device tree bindings, the rest · Maintainers:
Will Deacon, Mark Rutland, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- .../devicetree/bindings/perf/st,stm32-ddr-pmu.yaml | 94 ++++++++++++++++++++++ 1 file changed, 94 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..34e1bba65f04
--- /dev/null
+++ b/Documentation/devicetree/bindings/perf/st,stm32-ddr-pmu.yaml@@ -0,0 +1,94 @@ +# 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 <legoffic.clement@gmail.com> + +title: STMicroelectronics STM32 DDR Performance Monitor (DDRPERFM) + +properties: + compatible: + oneOf: + - items: + - const: st,stm32mp131-ddr-pmu + - items: + - enum: + - st,stm32mp151-ddr-pmu + - const: st,stm32mp131-ddr-pmu + - items: + - 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: + const: st,stm32mp131-ddr-pmu + then: + required: + - clocks + - resets + + - if: + properties: + compatible: + contains: + const: st,stm32mp251-ddr-pmu + then: + required: + - access-controllers + - memory-channel + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/stm32mp1-clks.h> + #include <dt-bindings/reset/stm32mp1-resets.h> + + perf@5a007000 { + compatible = "st,stm32mp151-ddr-pmu", "st,stm32mp131-ddr-pmu"; + reg = <0x5a007000 0x400>; + clocks = <&rcc DDRPERFM>; + resets = <&rcc DDRPERFM_R>; + }; + + - | + ddr_channel: ddr3-channel { + #address-cells = <1>; + #size-cells = <0>; + compatible = "jedec,ddr3-channel"; + io-width = <16>; + }; + + perf@48041000 { + compatible = "st,stm32mp251-ddr-pmu"; + reg = <0x48041000 0x400>; + access-controllers = <&rcc 104>; + memory-channel = <&ddr_channel>; + };
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2.43.0