linux-kernel - [PATCH v5 2/2] dt-bindings: mtd: Document Macronix NAND device bindings

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Message-Id: <1581922600-25461-3-git-send-email-masonccyang@mxic.com.tw>
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