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Date: Mon, 17 Feb 2020 14:56:40 +0800 From: Mason Yang <masonccyang@...c.com.tw> To: miquel.raynal@...tlin.com, richard@....at, vigneshr@...com, robh+dt@...nel.org, mark.rutland@....com Cc: devicetree@...r.kernel.org, tglx@...utronix.de, juliensu@...c.com.tw, frieder.schrempf@...tron.de, allison@...utok.net, linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org, yuehaibing@...wei.com, Mason Yang <masonccyang@...c.com.tw> Subject: [PATCH v5 2/2] dt-bindings: mtd: Document Macronix NAND device bindings Document the bindings used by the Macronix NAND device. Signed-off-by: Mason Yang <masonccyang@...c.com.tw> Reviewed-by: Rob Herring <robh@...nel.org> --- .../devicetree/bindings/mtd/nand-macronix.txt | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/nand-macronix.txt diff --git a/Documentation/devicetree/bindings/mtd/nand-macronix.txt b/Documentation/devicetree/bindings/mtd/nand-macronix.txt new file mode 100644 index 0000000..1d7a895 --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/nand-macronix.txt @@ -0,0 +1,28 @@ +Macronix NANDs Device Tree Bindings +----------------------------------- + +Macronix NANDs support randomizer operation for user data scrambled, +which can be enabled with a SET_FEATURE. The penalty of randomizer are +subpage accesses prohibited and more time period is needed in program +operation, i.e., tPROG 300us to 340us(randomizer enabled). +Randomizer enabled is a one time persistent and non reversible operatoin. + +For more high-reliability concern, if subpage write not available with +hardware ECC and filesystem and then to enable randomizer is recommended +by default. + +By adding a new specific property in children nodes to enable +randomizer function. + +Required NAND chip properties in children mode: +- randomizer enable: should be "mxic,enable-randomizer-otp" + +Example: + + nand: nand-controller@...t-address { + + nand@0 { + reg = <0>; + mxic,enable-randomizer-otp; + }; + }; -- 1.9.1
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