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Fri, 10 Mar 2023 11:06:39 -0800 From: Dipen Patel To: , , , , , , , , , , , , , CC: Dipen Patel Subject: [PATCH V3 3/6] hte: Re-phrase tegra API document Date: Fri, 10 Mar 2023 11:06:31 -0800 Message-ID: <20230310190634.5053-4-dipenp@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230310190634.5053-1-dipenp@nvidia.com> References: <20230310190634.5053-1-dipenp@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT085:EE_|IA1PR12MB7712:EE_ X-MS-Office365-Filtering-Correlation-Id: 41fdef68-452e-431b-da8e-08db219a9bfe 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:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(396003)(39860400002)(376002)(136003)(346002)(451199018)(40470700004)(36840700001)(46966006)(82310400005)(83380400001)(336012)(2616005)(47076005)(36860700001)(426003)(40460700003)(2906002)(86362001)(921005)(40480700001)(356005)(82740400003)(70586007)(7636003)(36756003)(70206006)(4326008)(316002)(8676002)(7416002)(5660300002)(8936002)(41300700001)(6666004)(107886003)(1076003)(186003)(110136005)(478600001)(7696005)(26005)(2101003)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2023 19:06:52.7189 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 41fdef68-452e-431b-da8e-08db219a9bfe X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT085.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7712 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Make Tegra194 API document generic to make it applicable for current and future tegra hte providers. Signed-off-by: Dipen Patel --- Documentation/driver-api/hte/tegra194-hte.rst | 33 +++++++++---------- 1 file changed, 16 insertions(+), 17 deletions(-) diff --git a/Documentation/driver-api/hte/tegra194-hte.rst b/Documentation/driver-api/hte/tegra194-hte.rst index f2d617265546..85e654772782 100644 --- a/Documentation/driver-api/hte/tegra194-hte.rst +++ b/Documentation/driver-api/hte/tegra194-hte.rst @@ -5,25 +5,25 @@ HTE Kernel provider driver Description ----------- -The Nvidia tegra194 HTE provider driver implements two GTE -(Generic Timestamping Engine) instances: 1) GPIO GTE and 2) LIC -(Legacy Interrupt Controller) IRQ GTE. Both GTE instances get the -timestamp from the system counter TSC which has 31.25MHz clock rate, and the -driver converts clock tick rate to nanoseconds before storing it as timestamp -value. +The Nvidia tegra HTE provider also known as GTE (Generic Timestamping Engine) +driver implements two GTE instances: 1) GPIO GTE and 2) LIC +(Legacy Interrupt Controller) IRQ GTE. Both GTE instances get the timestamp +from the system counter TSC which has 31.25MHz clock rate, and the driver +converts clock tick rate to nanoseconds before storing it as timestamp value. GPIO GTE -------- This GTE instance timestamps GPIO in real time. For that to happen GPIO -needs to be configured as input. The always on (AON) GPIO controller instance -supports timestamping GPIOs in real time and it has 39 GPIO lines. The GPIO GTE -and AON GPIO controller are tightly coupled as it requires very specific bits -to be set in GPIO config register before GPIO GTE can be used, for that GPIOLIB -adds two optional APIs as below. The GPIO GTE code supports both kernel -and userspace consumers. The kernel space consumers can directly talk to HTE -subsystem while userspace consumers timestamp requests go through GPIOLIB CDEV -framework to HTE subsystem. +needs to be configured as input. Only the always on (AON) GPIO controller +instance supports timestamping GPIOs in real time as it is tightly coupled with +the GPIO GTE. To support this, GPIOLIB adds two optional APIs as mentioned +below. The GPIO GTE code supports both kernel and userspace consumers. The +kernel space consumers can directly talk to HTE subsystem while userspace +consumers timestamp requests go through GPIOLIB CDEV framework to HTE +subsystem. The hte devicetree binding described at +``Documentation/devicetree/bindings/timestamp`` provides an example of how a +consumer can request an GPIO line. See gpiod_enable_hw_timestamp_ns() and gpiod_disable_hw_timestamp_ns(). @@ -34,9 +34,8 @@ returns the timestamp in nanoseconds. LIC (Legacy Interrupt Controller) IRQ GTE ----------------------------------------- -This GTE instance timestamps LIC IRQ lines in real time. There are 352 IRQ -lines which this instance can add timestamps to in real time. The hte -devicetree binding described at ``Documentation/devicetree/bindings/timestamp`` +This GTE instance timestamps LIC IRQ lines in real time. The hte devicetree +binding described at ``Documentation/devicetree/bindings/timestamp`` provides an example of how a consumer can request an IRQ line. Since it is a one-to-one mapping with IRQ GTE provider, consumers can simply specify the IRQ number that they are interested in. There is no userspace consumer support for -- 2.17.1