linux-kernel - [PATCH 0/4] Add a property to override the quad mode

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Message-ID: <20230815154412.713846-1-hsinyi@chromium.org>
Date:   Tue, 15 Aug 2023 23:31:51 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Pratyush Yadav <pratyush@...nel.org>,
        Michael Walle <michael@...le.cc>,
        "Miquel Raynal )" <miquel.raynal@...tlin.com>,
        "Richard Weinberger )" <richard@....at>,
        "Vignesh Raghavendra )" <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        cros-qcom-dts-watchers@...omium.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH 0/4] Add a property to override the quad mode

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