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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250120-scmi-fwdevlink-v2-2-3af2fa37dbac@nxp.com> References: <20250120-scmi-fwdevlink-v2-0-3af2fa37dbac@nxp.com> In-Reply-To: <20250120-scmi-fwdevlink-v2-0-3af2fa37dbac@nxp.com> To: Sudeep Holla , Cristian Marussi , Saravana Kannan , Linus Walleij , Dong Aisheng , Fabio Estevam , Shawn Guo , Jacky Bai , Pengutronix Kernel Team , Sascha Hauer Cc: arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, imx@lists.linux.dev, Peng Fan X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1737357232; l=2685; i=peng.fan@nxp.com; s=20230812; h=from:subject:message-id; bh=aQkTl5KnV+Ghr5dkzA87eUlMVoRB+D46A6vU1kqaigQ=; b=2VL8YIT/05Gg64JAQiw/Y2bzpscQRRjXN/on6j2pFc5P5hM0/NihawvdpJmFbEJQQb+20Rg6M MfGAJ+yl1pdBV6ezgTlbGKzcXN+C9vgw3n8RcKHVIZ7a14O6HG9YCWc X-Developer-Key: i=peng.fan@nxp.com; a=ed25519; pk=I4sJg7atIT1g63H7bb5lDRGR2gJW14RKDD0wFL8TT1g= X-ClientProxiedBy: SG2PR01CA0129.apcprd01.prod.exchangelabs.com (2603:1096:4:40::33) To PAXPR04MB8459.eurprd04.prod.outlook.com (2603:10a6:102:1da::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB8459:EE_|AM8PR04MB7442:EE_ X-MS-Office365-Filtering-Correlation-Id: b7d68899-72c9-40d1-3a60-08dd392217d7 X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|7416014|52116014|921020|38350700014; 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If both drivers are built in, and the scmi device with name "pinctrl-imx" is created earlier, and the fwnode device points to the scmi device, non-i.MX platforms will never have the pinctrl supplier ready. Vendor A use 0x80 for feature X, Vendor B use 0x80 for feature Y. With both drivers built in, two scmi devices will be created, and both drivers will be probed. On A's patform, feature Y probe may fail, vice verus. Introduce machine_allowlist and machine_blocklist to allow or block the creation of scmi devices to address above issues. machine_blocklist is non-vendor protocols, but vendor has its own implementation. Saying need to block pinctrl-scmi.c on i.MX95. machine_allowlist is for vendor protocols. Saying vendor A drivers only allow vendor A machine, vendor B machines only allow vendor B machine. Signed-off-by: Peng Fan --- drivers/firmware/arm_scmi/bus.c | 14 ++++++++++++++ include/linux/scmi_protocol.h | 3 +++ 2 files changed, 17 insertions(+) diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c index 7850eb7710f499888d32aebf5d99df63db8bfa26..76a5d946de7a8e16f5d940abc4f542aac5bb2b92 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -55,6 +55,20 @@ static int scmi_protocol_device_request(const struct scmi_device_id *id_table) unsigned int id = 0; struct list_head *head, *phead = NULL; struct scmi_requested_dev *rdev; + const char * const *allowlist = id_table->machine_allowlist; + const char * const *blocklist = id_table->machine_blocklist; + + if (blocklist && of_machine_compatible_match(blocklist)) { + pr_debug("block SCMI device (%s) for protocol %x\n", + id_table->name, id_table->protocol_id); + return 0; + } + + if (allowlist && !of_machine_compatible_match(allowlist)) { + pr_debug("block SCMI device (%s) for protocol %x\n", + id_table->name, id_table->protocol_id); + return 0; + } pr_debug("Requesting SCMI device (%s) for protocol %x\n", id_table->name, id_table->protocol_id); diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 688466a0e816247d24704f7ba109667a14226b67..e1b822d3522ff25168f895a4b1ed4c4e9a35bfff 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -950,6 +950,9 @@ struct scmi_device { struct scmi_device_id { u8 protocol_id; const char *name; + /* Optional */ + const char * const *machine_blocklist; + const char * const *machine_allowlist; }; struct scmi_driver { -- 2.37.1