[PATCH 1/4] dt-bindings: mtd: jedec,spi-nor: Add disable-quad-mode property

[Hsin-Yi Wang <hsinyi@chromium.org>]

Some flash devices, eg. gd25lq64c, enable quad mode by default after
spi_nor_parse_bfpt(). However, the systems using these flash devices may
required the quad mode to be turned off for using write protection or to
avoid a potential short issue[1].

Add a disable-quad-mode property in devicetree that system can use it to
override the quad mode status parsed from BFPT.

[1]
https://www.elm-tech.com/ja/products/spi-flash-memory/gd25lq64/gd25lq64.pdf
page 13

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
 Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
index 58f0cea160ef5..4cf1da1108500 100644
--- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
@@ -72,6 +72,13 @@ properties:
       be used on such systems, to denote the absence of a reliable reset
       mechanism.
 
+  disable-quad-mode:
+    type: boolean
+    description:
+      Some flash devices enables QE bit after BFPT is parsed. However, some system
+      may required quad mode to be disabled to use write protection. This boolean
+      flag is to override the quad enable status parsed from BFPT.
+
   no-wp:
     type: boolean
     description:
-- 
2.41.0.694.ge786442a9b-goog