dt-bindings: dma: New directory for STM32 DMA controllers bindings

Gather the STM32 DMA controllers bindings under ./dma/stm32/.
Then fix reference to old path in spi/st,stm32-spi.yaml: update the dmas
property description by referring to all STM32 DMA controllers bindings.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20240531150712.2503554-2-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/stm32/st,stm32-dma.yaml

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/dma/st,stm32-dma.yaml#
+$id: http://devicetree.org/schemas/dma/stm32/st,stm32-dma.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: STMicroelectronics STM32 DMA Controller
@@ -53,7 +53,7 @@ maintainers:
   - Amelie Delaunay <amelie.delaunay@foss.st.com>
 
 allOf:
-  - $ref: dma-controller.yaml#
+  - $ref: /schemas/dma/dma-controller.yaml#
 
 properties:
   "#dma-cells":

Documentation/devicetree/bindings/dma/stm32/st,stm32-dmamux.yaml

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/dma/st,stm32-dmamux.yaml#
+$id: http://devicetree.org/schemas/dma/stm32/st,stm32-dmamux.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: STMicroelectronics STM32 DMA MUX (DMA request router)
@@ -10,7 +10,7 @@ maintainers:
   - Amelie Delaunay <amelie.delaunay@foss.st.com>
 
 allOf:
-  - $ref: dma-router.yaml#
+  - $ref: /schemas/dma/dma-router.yaml#
 
 properties:
   "#dma-cells":

Documentation/devicetree/bindings/dma/stm32/st,stm32-mdma.yaml

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/dma/st,stm32-mdma.yaml#
+$id: http://devicetree.org/schemas/dma/stm32/st,stm32-mdma.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: STMicroelectronics STM32 MDMA Controller
@@ -53,7 +53,7 @@ maintainers:
   - Amelie Delaunay <amelie.delaunay@foss.st.com>
 
 allOf:
-  - $ref: dma-controller.yaml#
+  - $ref: /schemas/dma/dma-controller.yaml#
 
 properties:
   "#dma-cells":

Documentation/devicetree/bindings/spi/st,stm32-spi.yaml

@@ -42,7 +42,7 @@ properties:
   dmas:
     description: |
       DMA specifiers for tx and rx dma. DMA fifo mode must be used. See
-      the STM32 DMA bindings Documentation/devicetree/bindings/dma/st,stm32-dma.yaml.
+      the STM32 DMA controllers bindings Documentation/devicetree/bindings/dma/stm32/*.yaml.
     items:
       - description: rx DMA channel
       - description: tx DMA channel