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Mon, 20 May 2019 03:06:35 +0000 From: Peng Fan To: "srinivas.kandagatla@linaro.org" , "robh+dt@kernel.org" , "shawnguo@kernel.org" , "mark.rutland@arm.com" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" Subject: [RFC 1/2] dt-bindings: imx-ocotp: Add fusable-node property Thread-Topic: [RFC 1/2] dt-bindings: imx-ocotp: Add fusable-node property Thread-Index: AQHVDrkIcB6j+hDf/kC51b4HJvSviA== Date: Mon, 20 May 2019 03:06:35 +0000 Message-ID: <20190520032020.7920-1-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.16.4 x-clientproxiedby: HK0PR03CA0055.apcprd03.prod.outlook.com (2603:1096:203:52::19) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1a61d514-2f7a-40b8-bdaa-08d6dcd02acf x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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The property will only be used by Firmware(eg. U-Boot) to runtime disable the nodes. Take i.MX6ULL for example, there are several parts that only have limited modules enabled controlled by OCOTP fuse. It is not flexible to provide several dts for the serval parts, instead we could provide one device tree and let Firmware to runtime disable the device tree nodes for those modules that are disable(fused). Signed-off-by: Peng Fan --- Currently NXP vendor use U-Boot to set status to disabled for devices that could not function, https://source.codeaurora.org/external/imx/uboot-imx/tree/arch/arm/mach-imx/mx6/module_fuse.c?h=imx_v2018.03_4.14.98_2.0.0_ga#n149 But this approach is will not work if kernel dts node path changed. There are two approaches to resolve: 1. This patch is to add a fusable-node property, and Firmware will parse the property and read fuse to decide whether to disable or keeep enable the nodes. 2. There is another approach is that add nvmem-cells for all nodes that could be disabled(fused). Then in each linux driver to use nvmem api to detect fused or not, or in linux driver common code to check device functionable or not with nvmem API. To make it easy to work, we choose [1] here. Please advise whether it is acceptable, because the property is not used by linux driver in approach [1]. Or you prefer [2] or please advise if any better solution. Thanks. Documentation/devicetree/bindings/nvmem/imx-ocotp.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt b/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt index 7a999a135e56..e9a998588dbd 100644 --- a/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt +++ b/Documentation/devicetree/bindings/nvmem/imx-ocotp.txt @@ -21,6 +21,8 @@ Required properties: Optional properties: - read-only: disable write access +- fusable-node: array of phandles with reg base and bit offset, this + property is used by Firmware to runtime disable nodes. Optional Child nodes: @@ -42,4 +44,7 @@ Example: tempmon_temp_grade: temp-grade@20 { reg = <0x20 4>; }; + + fusable-node = <&usdhc1 0x10 4 + &usdhc2 0x10 5>; }; From patchwork Mon May 20 03:06:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peng Fan X-Patchwork-Id: 10949809 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B5E961395 for ; Mon, 20 May 2019 03:06:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A3D3B2833E for ; Mon, 20 May 2019 03:06:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 968DA28555; Mon, 20 May 2019 03:06:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3A7FB2833E for ; 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Mon, 20 May 2019 03:06:39 +0000 From: Peng Fan To: "srinivas.kandagatla@linaro.org" , "robh+dt@kernel.org" , "shawnguo@kernel.org" , "mark.rutland@arm.com" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" Subject: [RFC 2/2] ARM: dts: imx6ull/z: add fusable-node property Thread-Topic: [RFC 2/2] ARM: dts: imx6ull/z: add fusable-node property Thread-Index: AQHVDrkK3jBoIPPnL0GIqBs7vhW/3w== Date: Mon, 20 May 2019 03:06:39 +0000 Message-ID: <20190520032020.7920-2-peng.fan@nxp.com> References: <20190520032020.7920-1-peng.fan@nxp.com> In-Reply-To: <20190520032020.7920-1-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.16.4 x-clientproxiedby: HK0PR03CA0055.apcprd03.prod.outlook.com (2603:1096:203:52::19) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a70147ba-43c6-4a30-b5f9-08d6dcd02d1a x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "devicetree@vger.kernel.org" , Peng Fan , "linux-kernel@vger.kernel.org" , dl-linux-imx , "festevam@gmail.com" , "linux-arm-kernel@lists.infradead.org" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add fusable-node property for OCOTP Signed-off-by: Peng Fan --- arch/arm/boot/dts/imx6ull.dtsi | 7 +++++++ arch/arm/boot/dts/imx6ulz.dtsi | 6 ++++++ 2 files changed, 13 insertions(+) diff --git a/arch/arm/boot/dts/imx6ull.dtsi b/arch/arm/boot/dts/imx6ull.dtsi index 22e4a307fa59..b616ed6ee4bf 100644 --- a/arch/arm/boot/dts/imx6ull.dtsi +++ b/arch/arm/boot/dts/imx6ull.dtsi @@ -32,6 +32,13 @@ &ocotp { compatible = "fsl,imx6ull-ocotp", "syscon"; + + fusable-node = <&tsc 0xc 22 + &can1 0xc 26 + &can2 0xc 27 + &usdhc1 0x10 4 + &usdhc2 0x10 5 + >; }; &usdhc1 { diff --git a/arch/arm/boot/dts/imx6ulz.dtsi b/arch/arm/boot/dts/imx6ulz.dtsi index 0b5f1a763567..8edd9008e38b 100644 --- a/arch/arm/boot/dts/imx6ulz.dtsi +++ b/arch/arm/boot/dts/imx6ulz.dtsi @@ -19,6 +19,12 @@ }; }; +&ocotp { + fusable-node = <&usdhc1 0x10 4 + &usdhc2 0x10 5 + >; +}; + /delete-node/ &adc1; /delete-node/ &ecspi3; /delete-node/ &ecspi4;