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Wed, 12 Jan 2022 06:14:58 -0800 From: Akhil R To: , , , , , , , , , , , , , , CC: Subject: [PATCH v2 2/3] docs: firmware-guide: ACPI: Add named interrupt doc Date: Wed, 12 Jan 2022 19:44:21 +0530 Message-ID: <1641996862-26960-3-git-send-email-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1641996862-26960-1-git-send-email-akhilrajeev@nvidia.com> References: <1641996862-26960-1-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: 93495c88-7866-4e8f-7d2d-08d9d5d5edba X-MS-TrafficTypeDiagnostic: DM5PR1201MB2554:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(4636009)(40470700002)(36840700001)(46966006)(81166007)(356005)(4326008)(2616005)(107886003)(70586007)(82310400004)(508600001)(70206006)(2906002)(47076005)(40460700001)(36756003)(110136005)(36860700001)(921005)(86362001)(7416002)(83380400001)(8676002)(186003)(5660300002)(6666004)(336012)(26005)(7696005)(8936002)(316002)(426003)(83996005)(2101003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jan 2022 14:15:04.1089 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 93495c88-7866-4e8f-7d2d-08d9d5d5edba X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.235]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT033.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB2554 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Added details and example for named interrupts in the ACPI Table Signed-off-by: Akhil R --- Documentation/firmware-guide/acpi/enumeration.rst | 38 +++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/Documentation/firmware-guide/acpi/enumeration.rst b/Documentation/firmware-guide/acpi/enumeration.rst index 74b830b2..30ae41c 100644 --- a/Documentation/firmware-guide/acpi/enumeration.rst +++ b/Documentation/firmware-guide/acpi/enumeration.rst @@ -143,6 +143,44 @@ 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 with ACPI node can have names to interrupts in 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 +property in 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 property +and 'alert' to 0x24. + +The driver can call the function - device_irq_get_byname with the device +and interrupt name as arguments to get the corresponding irq number. + SPI serial bus support ======================