[PATCH 07/11] DT: nand-controller: Reflect reality of marvell,orion-nand

[Andrew Lunn <andrew@lunn.ch>]

The Marvell Orion NAND driver comes from before the time of the
standardised NAND binding. The controller only supports a single
device, and expects the NAND partition table to be directly in the
controller node. This goes against the standardised NAND binding which
expects a sub node per NAND device, which contains the partition
table.

Since the partition table contains a reg property indicating the start
address of the partition and its length, it needs #size-cells set to
1. However, for a list of nand devices, the reg value is the device
number, requiring #size-cells of 0.

Add an exception to nand-controller.yaml to allow this #size-cells
value when the compatible matches the orion controller.

In order that the example works, it needs a compatible string so the
comparison can be made.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 .../bindings/mtd/nand-controller.yaml           | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mtd/nand-controller.yaml b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
index 359a015d4e5a..ab90e34557ad 100644
--- a/Documentation/devicetree/bindings/mtd/nand-controller.yaml
+++ b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
@@ -34,7 +34,7 @@ properties:
     const: 1
 
   "#size-cells":
-    const: 0
+    enum: [0, 1]
 
   ranges: true
 
@@ -130,11 +130,26 @@ required:
   - "#address-cells"
   - "#size-cells"
 
+if:
+  properties:
+    compatible:
+      contains:
+        const: marvell,orion-nand
+then:
+  properties:
+    "#size-cells":
+      const: 1
+else:
+  properties:
+    "#size-cells":
+      const: 0
+
 additionalProperties: true
 
 examples:
   - |
     nand-controller {
+      compatible = "bar";
       #address-cells = <1>;
       #size-cells = <0>;
       cs-gpios = <0>, <&gpioA 1>; /* A single native CS is available */
-- 
2.37.2