From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13366C7619B for ; Mon, 17 Feb 2020 06:58:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D98E7206D5 for ; Mon, 17 Feb 2020 06:58:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726791AbgBQG6V (ORCPT ); Mon, 17 Feb 2020 01:58:21 -0500 Received: from twhmllg3.macronix.com ([122.147.135.201]:57641 "EHLO TWHMLLG3.macronix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725855AbgBQG6Q (ORCPT ); Mon, 17 Feb 2020 01:58:16 -0500 Received: from localhost.localdomain ([172.17.195.96]) by TWHMLLG3.macronix.com with ESMTP id 01H6ug7R005796; Mon, 17 Feb 2020 14:56:44 +0800 (GMT-8) (envelope-from masonccyang@mxic.com.tw) From: Mason Yang To: miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, robh+dt@kernel.org, mark.rutland@arm.com Cc: devicetree@vger.kernel.org, tglx@linutronix.de, juliensu@mxic.com.tw, frieder.schrempf@kontron.de, allison@lohutok.net, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, yuehaibing@huawei.com, Mason Yang Subject: [PATCH v5 2/2] dt-bindings: mtd: Document Macronix NAND device bindings Date: Mon, 17 Feb 2020 14:56:40 +0800 Message-Id: <1581922600-25461-3-git-send-email-masonccyang@mxic.com.tw> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1581922600-25461-1-git-send-email-masonccyang@mxic.com.tw> References: <1581922600-25461-1-git-send-email-masonccyang@mxic.com.tw> X-MAIL: TWHMLLG3.macronix.com 01H6ug7R005796 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document the bindings used by the Macronix NAND device. Signed-off-by: Mason Yang Reviewed-by: Rob Herring --- .../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@unit-address { + + nand@0 { + reg = <0>; + mxic,enable-randomizer-otp; + }; + }; -- 1.9.1