dt-bindings: dma: dma40: Prefer to pass sram through phandle

Extend the DMA40 bindings so that we can pass two SRAM
segments as phandles instead of directly referring to the
memory address in the second reg cell. This enables more
granular control over the SRAM, and adds the optiona LCLA
SRAM segment as well.

Deprecate the old way of passing LCPA as a second reg cell,
make sram compulsory.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230417-ux500-dma40-cleanup-v3-1-60bfa6785968@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/stericsson,dma40.yaml

@@ -112,14 +112,23 @@ properties:
       - const: stericsson,dma40
 
   reg:
-    items:
-      - description: DMA40 memory base
-      - description: LCPA memory base
+    oneOf:
+      - items:
+          - description: DMA40 memory base
+      - items:
+          - description: DMA40 memory base
+          - description: LCPA memory base, deprecated, use eSRAM pool instead
+        deprecated: true
+
 
   reg-names:
-    items:
-      - const: base
-      - const: lcpa
+    oneOf:
+      - items:
+          - const: base
+      - items:
+          - const: base
+          - const: lcpa
+        deprecated: true
 
   interrupts:
     maxItems: 1
@@ -127,6 +136,15 @@ properties:
   clocks:
     maxItems: 1
 
+  sram:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: A phandle array with inner size 1 (no arg cells).
+      First phandle is the LCPA (Logical Channel Parameter Address) memory.
+      Second phandle is the  LCLA (Logical Channel Link base Address) memory.
+    maxItems: 2
+    items:
+      maxItems: 1
+
   memcpy-channels:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description: Array of u32 elements indicating which channels on the DMA
@@ -138,6 +156,7 @@ required:
   - reg
   - interrupts
   - clocks
+  - sram
   - memcpy-channels
 
 additionalProperties: false
@@ -149,8 +168,9 @@ examples:
     #include <dt-bindings/mfd/dbx500-prcmu.h>
     dma-controller@801c0000 {
         compatible = "stericsson,db8500-dma40", "stericsson,dma40";
-        reg = <0x801c0000 0x1000>, <0x40010000 0x800>;
-        reg-names = "base", "lcpa";
+        reg = <0x801c0000 0x1000>;
+        reg-names = "base";
+        sram = <&lcpa>, <&lcla>;
         interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
         #dma-cells = <3>;
         memcpy-channels = <56 57 58 59 60>;