On gigadevice gd25lq64c, the quad mode is enabled after BFPT is parsed. According to datasheet[1], Quad enable (QE) bit needs to be set to 0 to use write protection (WP) pin. It also recommends setting default value of QE to 0 to avoid a potential short issue. Add a disable-quad-mode property in devicetree that platform can use it to override the quad mode status parsed from BFPT to use write protection. [1] https://www.elm-tech.com/ja/products/spi-flash-memory/gd25lq64/gd25lq64.pdf page 13 Hsin-Yi Wang (4): dt-bindings: mtd: jedec,spi-nor: Add disable-quad-mode property mtd: spi-nor: sfdp: read disable-quad-mode property arm64: dts: mediatek: mt8183: disable quad mode for spi nor arm64: dts: qcom: sc7180: disable quad mode for spi nor Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 7 +++++++ arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 1 + arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 + drivers/mtd/spi-nor/core.c | 5 +++++ drivers/mtd/spi-nor/core.h | 1 + drivers/mtd/spi-nor/debugfs.c | 1 + 6 files changed, 16 insertions(+) -- 2.41.0.694.ge786442a9b-goog