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Mon, 20 May 2019 03:06:35 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::3173:24:d401:2378]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::3173:24:d401:2378%6]) with mapi id 15.20.1900.020; 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; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce fusable-node property for i.MX OCOTP driver. 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>; }; -- 2.16.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peng Fan Subject: [RFC 1/2] dt-bindings: imx-ocotp: Add fusable-node property Date: Mon, 20 May 2019 03:06:35 +0000 Message-ID: <20190520032020.7920-1-peng.fan@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: "srinivas.kandagatla@linaro.org" , "robh+dt@kernel.org" , "shawnguo@kernel.org" , "mark.rutland@arm.com" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" Cc: "festevam@gmail.com" , dl-linux-imx , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Peng Fan List-Id: devicetree@vger.kernel.org SW50cm9kdWNlIGZ1c2FibGUtbm9kZSBwcm9wZXJ0eSBmb3IgaS5NWCBPQ09UUCBkcml2ZXIuDQpU aGUgcHJvcGVydHkgd2lsbCBvbmx5IGJlIHVzZWQgYnkgRmlybXdhcmUoZWcuIFUtQm9vdCkgdG8N CnJ1bnRpbWUgZGlzYWJsZSB0aGUgbm9kZXMuDQoNClRha2UgaS5NWDZVTEwgZm9yIGV4YW1wbGUs IHRoZXJlIGFyZSBzZXZlcmFsIHBhcnRzIHRoYXQgb25seQ0KaGF2ZSBsaW1pdGVkIG1vZHVsZXMg ZW5hYmxlZCBjb250cm9sbGVkIGJ5IE9DT1RQIGZ1c2UuIEl0IGlzDQpub3QgZmxleGlibGUgdG8g cHJvdmlkZSBzZXZlcmFsIGR0cyBmb3IgdGhlIHNlcnZhbCBwYXJ0cywgaW5zdGVhZA0Kd2UgY291 bGQgcHJvdmlkZSBvbmUgZGV2aWNlIHRyZWUgYW5kIGxldCBGaXJtd2FyZSB0byBydW50aW1lIGRp c2FibGUNCnRoZSBkZXZpY2UgdHJlZSBub2RlcyBmb3IgdGhvc2UgbW9kdWxlcyB0aGF0IGFyZSBk aXNhYmxlKGZ1c2VkKS4NCg0KU2lnbmVkLW9mZi1ieTogUGVuZyBGYW4gPHBlbmcuZmFuQG54cC5j b20+DQotLS0NCg0KQ3VycmVudGx5IE5YUCB2ZW5kb3IgdXNlIFUtQm9vdCB0byBzZXQgc3RhdHVz IHRvIGRpc2FibGVkIGZvciBkZXZpY2VzDQp0aGF0IGNvdWxkIG5vdCBmdW5jdGlvbiwNCmh0dHBz Oi8vc291cmNlLmNvZGVhdXJvcmEub3JnL2V4dGVybmFsL2lteC91Ym9vdC1pbXgvdHJlZS9hcmNo L2FybS9tYWNoLWlteC9teDYvbW9kdWxlX2Z1c2UuYz9oPWlteF92MjAxOC4wM180LjE0Ljk4XzIu MC4wX2dhI24xNDkNCkJ1dCB0aGlzIGFwcHJvYWNoIGlzIHdpbGwgbm90IHdvcmsgaWYga2VybmVs IGR0cyBub2RlIHBhdGggY2hhbmdlZC4NCg0KVGhlcmUgYXJlIHR3byBhcHByb2FjaGVzIHRvIHJl c29sdmU6DQoNCjEuIFRoaXMgcGF0Y2ggaXMgdG8gYWRkIGEgZnVzYWJsZS1ub2RlIHByb3BlcnR5 LCBhbmQgRmlybXdhcmUgd2lsbCBwYXJzZQ0KICAgdGhlIHByb3BlcnR5IGFuZCByZWFkIGZ1c2Ug dG8gZGVjaWRlIHdoZXRoZXIgdG8gZGlzYWJsZSBvciBrZWVlcCBlbmFibGUNCiAgIHRoZSBub2Rl cy4NCg0KMi4gVGhlcmUgaXMgYW5vdGhlciBhcHByb2FjaCBpcyB0aGF0IGFkZCBudm1lbS1jZWxs cyBmb3IgYWxsIG5vZGVzIHRoYXQNCiAgIGNvdWxkIGJlIGRpc2FibGVkKGZ1c2VkKS4gVGhlbiBp biBlYWNoIGxpbnV4IGRyaXZlciB0byB1c2UgbnZtZW0NCiAgIGFwaSB0byBkZXRlY3QgZnVzZWQg b3Igbm90LCBvciBpbiBsaW51eCBkcml2ZXIgY29tbW9uIGNvZGUgdG8gY2hlY2sNCiAgIGRldmlj ZSBmdW5jdGlvbmFibGUgb3Igbm90IHdpdGggbnZtZW0gQVBJLg0KDQoNClRvIG1ha2UgaXQgZWFz eSB0byB3b3JrLCB3ZSBjaG9vc2UgWzFdIGhlcmUuIFBsZWFzZSBhZHZpc2Ugd2hldGhlcg0KaXQg aXMgYWNjZXB0YWJsZSwgYmVjYXVzZSB0aGUgcHJvcGVydHkgaXMgbm90IHVzZWQgYnkgbGludXgg ZHJpdmVyIGluDQphcHByb2FjaCBbMV0uIE9yIHlvdSBwcmVmZXIgWzJdIG9yIHBsZWFzZSBhZHZp c2UgaWYgYW55IGJldHRlciBzb2x1dGlvbi4NCg0KVGhhbmtzLg0KDQogRG9jdW1lbnRhdGlvbi9k ZXZpY2V0cmVlL2JpbmRpbmdzL252bWVtL2lteC1vY290cC50eHQgfCA1ICsrKysrDQogMSBmaWxl IGNoYW5nZWQsIDUgaW5zZXJ0aW9ucygrKQ0KDQpkaWZmIC0tZ2l0IGEvRG9jdW1lbnRhdGlvbi9k ZXZpY2V0cmVlL2JpbmRpbmdzL252bWVtL2lteC1vY290cC50eHQgYi9Eb2N1bWVudGF0aW9uL2Rl dmljZXRyZWUvYmluZGluZ3MvbnZtZW0vaW14LW9jb3RwLnR4dA0KaW5kZXggN2E5OTlhMTM1ZTU2 Li5lOWE5OTg1ODhkYmQgMTAwNjQ0DQotLS0gYS9Eb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmlu ZGluZ3MvbnZtZW0vaW14LW9jb3RwLnR4dA0KKysrIGIvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVl L2JpbmRpbmdzL252bWVtL2lteC1vY290cC50eHQNCkBAIC0yMSw2ICsyMSw4IEBAIFJlcXVpcmVk IHByb3BlcnRpZXM6DQogDQogT3B0aW9uYWwgcHJvcGVydGllczoNCiAtIHJlYWQtb25seTogZGlz YWJsZSB3cml0ZSBhY2Nlc3MNCistIGZ1c2FibGUtbm9kZTogYXJyYXkgb2YgcGhhbmRsZXMgd2l0 aCByZWcgYmFzZSBhbmQgYml0IG9mZnNldCwgdGhpcw0KKwkJcHJvcGVydHkgaXMgdXNlZCBieSBG aXJtd2FyZSB0byBydW50aW1lIGRpc2FibGUgbm9kZXMuDQogDQogT3B0aW9uYWwgQ2hpbGQgbm9k ZXM6DQogDQpAQCAtNDIsNCArNDQsNyBAQCBFeGFtcGxlOg0KIAkJdGVtcG1vbl90ZW1wX2dyYWRl OiB0ZW1wLWdyYWRlQDIwIHsNCiAJCQlyZWcgPSA8MHgyMCA0PjsNCiAJCX07DQorDQorCQlmdXNh YmxlLW5vZGUgPSA8JnVzZGhjMSAweDEwIDQNCisJCQkJJnVzZGhjMiAweDEwIDU+Ow0KIAl9Ow0K LS0gDQoyLjE2LjQNCg0K