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Tue, 15 Aug 2023 08:44:51 -0700 (PDT) Received: from hsinyi-z840.tpe.corp.google.com ([2401:fa00:1:10:40cf:3807:f8c8:2d76]) by smtp.gmail.com with ESMTPSA id n13-20020aa78a4d000000b0065e154bac6dsm9431247pfa.133.2023.08.15.08.44.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Aug 2023 08:44:51 -0700 (PDT) From: Hsin-Yi Wang To: Tudor Ambarus , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , Bjorn Andersson Cc: Pratyush Yadav , Michael Walle , "Miquel Raynal )" , "Richard Weinberger )" , "Vignesh Raghavendra )" , Rob Herring , linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, cros-qcom-dts-watchers@chromium.org, Andy Gross , Konrad Dybcio Subject: [PATCH 1/4] dt-bindings: mtd: jedec,spi-nor: Add disable-quad-mode property Date: Tue, 15 Aug 2023 23:31:52 +0800 Message-ID: <20230815154412.713846-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.41.0.694.ge786442a9b-goog In-Reply-To: <20230815154412.713846-1-hsinyi@chromium.org> References: <20230815154412.713846-1-hsinyi@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230815_084454_765236_5D5A2594 X-CRM114-Status: GOOD ( 10.70 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.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 --- 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: