diff --git a/Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml b/Documentation/devicetree/bindings/memory-controllers/st,stm32mp25-omm.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/st,stm32mp25-omm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STM32 Octo Memory Manager (OMM)
+
+maintainers:
+  - Patrice Chotard <patrice.chotard@foss.st.com>
+
+description: |
+  The STM32 Octo Memory Manager is a low-level interface that enables an
+  efficient OCTOSPI pin assignment with a full I/O matrix (before alternate
+  function map) and multiplex of single/dual/quad/octal SPI interfaces over
+  the same bus. It Supports up to:
+    - Two single/dual/quad/octal SPI interfaces
+    - Two ports for pin assignment
+
+properties:
+  compatible:
+    const: st,stm32mp25-omm
+
+  "#address-cells":
+    const: 2
+
+  "#size-cells":
+    const: 1
+
+  ranges:
+    description: |
+      Reflects the memory layout with four integer values per OSPI instance.
+      Format:
+      <chip-select> 0 <registers base address> <size>
+    minItems: 2
+    maxItems: 2
+
+  reg:
+    items:
+      - description: OMM registers
+      - description: OMM memory map area
+
+  reg-names:
+    items:
+      - const: regs
+      - const: memory_map
+
+  memory-region:
+    description: |
+      Memory region shared between the 2 OCTOSPI instance.
+      One or two phandle to a node describing a memory mapped region
+      depending of child number.
+    minItems: 1
+    maxItems: 2
+
+  memory-region-names:
+    description: |
+      OCTOSPI instance's name to which memory region is associated
+    items:
+      enum: [ospi1, ospi2]
+    minItems: 1
+    maxItems: 2
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  access-controllers:
+    maxItems: 1
+
+  st,syscfg-amcr:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: |
+      The Address Mapping Control Register (AMCR) is used to split the 256MB
+      memory map area shared between the 2 OSPI instance. The Octo Memory
+      Manager sets the AMCR depending of the memory-region configuration.
+      The memory split bitmask description is:
+        - 000: OCTOSPI1 (256 Mbytes), OCTOSPI2 unmapped
+        - 001: OCTOSPI1 (192 Mbytes), OCTOSPI2 (64 Mbytes)
+        - 010: OCTOSPI1 (128 Mbytes), OCTOSPI2 (128 Mbytes)
+        - 011: OCTOSPI1 (64 Mbytes), OCTOSPI2 (192 Mbytes)
+        - 1xx: OCTOSPI1 unmapped, OCTOSPI2 (256 Mbytes)
+    items:
+      - description: phandle to syscfg
+      - description: register offset within syscfg
+      - description: register bitmask for memory split
+
+  st,omm-req2ack-ns:
+    description: |
+      In multiplexed mode (MUXEN = 1), this field defines the time in
+      nanoseconds between two transactions.
+
+  st,omm-cssel-ovr:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Configure the chip select selector override for the 2 OCTOSPIs.
+      - 0: OCTOSPI1 chip select send to NCS1 OCTOSPI2 chip select send to NCS1
+      - 1: OCTOSPI1 chip select send to NCS2 OCTOSPI2 chip select send to NCS1
+      - 2: OCTOSPI1 chip select send to NCS1 OCTOSPI2 chip select send to NCS2
+      - 3: OCTOSPI1 chip select send to NCS2 OCTOSPI2 chip select send to NCS2
+    minimum: 0
+    maximum: 3
+
+  st,omm-mux:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Configure the muxing between the 2 OCTOSPIs busses and the 2 output ports.
+      - 0: direct mode, default
+      - 1: mux OCTOSPI1 and OCTOSPI2 to port 1
+      - 2: swapped mode
+      - 3: mux OCTOSPI1 and OCTOSPI2 to port 2
+    minimum: 0
+    maximum: 3
+
+  power-domains:
+    maxItems: 1
+
+patternProperties:
+  ^spi@[a-f0-9]+$:
+    type: object
+    $ref: /schemas/spi/st,stm32mp25-ospi.yaml#
+    description: Required spi child node
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - clocks
+  - st,syscfg-amcr
+  - ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/st,stm32mp25-rcc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/reset/st,stm32mp25-rcc.h>
+    ommanager@40500000 {
+      compatible = "st,stm32mp25-omm";
+      reg = <0x40500000 0x400>, <0x60000000 0x10000000>;
+      reg-names = "regs", "memory_map";
+      ranges = <0 0 0x40430000 0x400>,
+               <1 0 0x40440000 0x400>;
+      memory-region = <&mm_ospi1>, <&mm_ospi2>;
+      memory-region-names = "ospi1", "ospi2";
+      pinctrl-0 = <&ospi_port1_clk_pins_a
+                   &ospi_port1_io03_pins_a
+                   &ospi_port1_cs0_pins_a>;
+      pinctrl-1 = <&ospi_port1_clk_sleep_pins_a
+                   &ospi_port1_io03_sleep_pins_a
+                   &ospi_port1_cs0_sleep_pins_a>;
+      pinctrl-names = "default", "sleep";
+      clocks = <&rcc CK_BUS_OSPIIOM>;
+      resets = <&rcc OSPIIOM_R>;
+      access-controllers = <&rifsc 111>;
+      power-domains = <&CLUSTER_PD>;
+      #address-cells = <2>;
+      #size-cells = <1>;
+      st,syscfg-amcr = <&syscfg 0x2c00 0x7>;
+      st,omm-req2ack-ns = <0>;
+      st,omm-mux = <0>;
+      st,omm-cssel-ovr = <0>;
+
+      spi@40430000 {
+        compatible = "st,stm32mp25-ospi";
+        reg = <0 0 0x400>;
+        memory-region = <&mm_ospi1>;
+        interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&hpdma 2 0x62 0x00003121 0x0>,
+               <&hpdma 2 0x42 0x00003112 0x0>;
+        dma-names = "tx", "rx";
+        clocks = <&scmi_clk CK_SCMI_OSPI1>;
+        resets = <&scmi_reset RST_SCMI_OSPI1>, <&scmi_reset RST_SCMI_OSPI1DLL>;
+        access-controllers = <&rifsc 74>;
+        power-domains = <&CLUSTER_PD>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        st,syscfg-dlyb = <&syscfg 0x1000>;
+      };
+
+      spi@40440000 {
+        compatible = "st,stm32mp25-ospi";
+        reg = <1 0 0x400>;
+        memory-region = <&mm_ospi1>;
+        interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
+        dmas = <&hpdma 3 0x62 0x00003121 0x0>,
+               <&hpdma 3 0x42 0x00003112 0x0>;
+        dma-names = "tx", "rx";
+        clocks = <&scmi_clk CK_KER_OSPI2>;
+        resets = <&scmi_reset RST_SCMI_OSPI2>, <&scmi_reset RST_SCMI_OSPI1DLL>;
+        access-controllers = <&rifsc 75>;
+        power-domains = <&CLUSTER_PD>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        st,syscfg-dlyb = <&syscfg 0x1000>;
+      };
+    };
