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

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Message-ID: <20230815154412.713846-2-hsinyi@chromium.org>
Date:   Tue, 15 Aug 2023 23:31:52 +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 1/4] dt-bindings: mtd: jedec,spi-nor: Add disable-quad-mode property

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@...omium.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