linux-kernel - [PATCH 1/2] dt-bindings: mtd: gpmi-nand: specify fsl,use-minimum-ecc behavior

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Message-Id: <20180206174021.5947-1-stefan@agner.ch>
Date:   Tue,  6 Feb 2018 18:40:20 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     han.xu@....com, boris.brezillon@...e-electrons.com
Cc:     marek.vasut@...il.com, richard@....at, dwmw2@...radead.org,
        cyrille.pitchen@...ev4u.fr, max.oss.09@...il.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH 1/2] dt-bindings: mtd: gpmi-nand: specify fsl,use-minimum-ecc behavior

The dt property fsl,use-minimum-ecc requires a NAND chip to
provide a ECC strength/step size, otherwise the driver fails
to probe. This is by design to avoid that the driver uses a
fallback and later changes ECC parameters due to additionion
of a NAND chip driver. Document the current behavior.

Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 Documentation/devicetree/bindings/mtd/gpmi-nand.txt | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
index b289ef3c1b7e..eb2d9919d063 100644
--- a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
@@ -34,9 +34,8 @@ Optional properties:
                        automatically discoverable for some flash
                        (e.g., according to the ONFI standard).
                        However, note that if this strength is not
-                       discoverable or this property is not enabled,
-                       the software may chooses an implementation-defined
-                       ECC scheme.
+                       discoverable the driver will fail probing with
+                       an error.
   - fsl,no-blockmark-swap: Don't swap the bad block marker from the OOB
                        area with the byte in the data area but rely on the
                        flash based BBT for identifying bad blocks.
-- 
2.16.1