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@xxxxxxxxxxxx> --- 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
