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Sat, 22 Jan 2022 03:33:19 -0800 From: Akhil R To: , , , , , , , , , , , , , , , CC: Subject: [PATCH v4 2/3] docs: firmware-guide: ACPI: Add named interrupt doc Date: Sat, 22 Jan 2022 17:02:45 +0530 Message-ID: <1642851166-27096-3-git-send-email-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1642851166-27096-1-git-send-email-akhilrajeev@nvidia.com> References: <1642851166-27096-1-git-send-email-akhilrajeev@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0123e401-c5e2-4a98-2aad-08d9dd9b011b X-MS-TrafficTypeDiagnostic: DM6PR12MB4976:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.235; 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Signed-off-by: Akhil R Acked-by: Rafael J. Wysocki --- Documentation/firmware-guide/acpi/enumeration.rst | 39 +++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/Documentation/firmware-guide/acpi/enumeration.rst b/Documentation/firmware-guide/acpi/enumeration.rst index 74b830b2..d002256 100644 --- a/Documentation/firmware-guide/acpi/enumeration.rst +++ b/Documentation/firmware-guide/acpi/enumeration.rst @@ -143,6 +143,45 @@ In robust cases the client unfortunately needs to call acpi_dma_request_slave_chan_by_index() directly and therefore choose the specific FixedDMA resource by its index. +Named Interrupts +================ + +Drivers enumerated via ACPI can have names to interrupts in the ACPI table +which can be used to get the IRQ number in the driver. + +The interrupt name can be listed in _DSD as 'interrupt-names'. The names +should be listed as an array of strings which will map to the Interrupt() +resource in the ACPI table corresponding to its index. + +The table below shows an example of its usage:: + + Device (DEV0) { + ... + Name (_CRS, ResourceTemplate() { + ... + Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive) { + 0x20, + 0x24 + } + }) + + Name (_DSD, Package () { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package () {"interrupt-names", + Package (2) {"default", "alert"}}, + } + ... + }) + } + +The interrupt name 'default' will correspond to 0x20 in Interrupt() +resource and 'alert' to 0x24. Note that only the Interrupt() resource +is mapped and not GpioInt() or similar. + +The driver can call the function - fwnode_irq_get_byname() with the fwnode +and interrupt name as arguments to get the corresponding IRQ number. + SPI serial bus support ======================