spi: dt-bindings: add spi-{tx,rx}-lane-map properties

Add spi-tx-lane-map and spi-rx-lane-map properties to the SPI peripheral
device tree binding. These properties allow specifying the mapping of
peripheral data lanes to controller data lanes. This is needed e.g. when
some lanes are skipped on the controller side so that the controller
can correctly route data to/from the peripheral.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20260123-spi-add-multi-bus-support-v6-2-12af183c06eb@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: dlech

Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml

@@ -75,6 +75,13 @@ properties:
       enum: [0, 1, 2, 4, 8]
     default: [1]
 
+  spi-rx-lane-map:
+    description: Mapping of peripheral SDO lanes to controller SDI lanes.
+      Each index in the array represents a peripheral SDO lane, and the value
+      at that index represents the corresponding controller SDI lane.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    default: [0, 1, 2, 3, 4, 5, 6, 7]
+
   spi-rx-delay-us:
     description:
       Delay, in microseconds, after a read transfer.
@@ -99,6 +106,13 @@ properties:
       enum: [0, 1, 2, 4, 8]
     default: [1]
 
+  spi-tx-lane-map:
+    description: Mapping of peripheral SDI lanes to controller SDO lanes.
+      Each index in the array represents a peripheral SDI lane, and the value
+      at that index represents the corresponding controller SDO lane.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    default: [0, 1, 2, 3, 4, 5, 6, 7]
+
   spi-tx-delay-us:
     description:
       Delay, in microseconds, after a write transfer.