[PATCH v11 1/2] dt-bindings: mtd: Document nand-ecc-engine

[Miquel Raynal]

This property is needed to precisely point to the hardware ECC engine
to use when there are several of them available. Here, hardware also
refers to the on-die possibility.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
 .../devicetree/bindings/mtd/nand-controller.yaml     | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/nand-controller.yaml b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
index 4a0798247d2d..0969d2e6720b 100644
--- a/Documentation/devicetree/bindings/mtd/nand-controller.yaml
+++ b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
@@ -56,6 +56,18 @@ patternProperties:
           (Linux will handle the calculations). soft_bch is deprecated
           and should be replaced by soft and nand-ecc-algo.
 
+      nand-ecc-engine:
+        maxItems: 1
+        description:
+	  A phandle on the hardware ECC engine if any. There are
+          basically three possibilities:
+          1/ The ECC engine is part of the NAND controller, in this
+          case the phandle should reference the parent node.
+          2/ The ECC engine is part of the NAND part (on-die), in this
+          case the phandle should reference the node itself.
+          3/ The ECC engine is external, in this case the phandle should
+          reference the specific ECC engine node.
+
       nand-ecc-placement:
         allOf:
           - $ref: /schemas/types.yaml#/definitions/string
-- 
2.20.1