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Niedermayr" To: , CC: , , , Subject: [PATCH v8 0/2] gpmc wait pin additions Date: Fri, 21 Oct 2022 10:16:10 +0200 Message-ID: <20221021081612.591613-1-benedikt.niedermayr@siemens.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [144.145.220.65] X-ClientProxiedBy: DEMCHDC8WAA.ad011.siemens.net (139.25.226.104) To DEMCHDC8WBA.ad011.siemens.net (139.25.226.105) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1EUR01FT015:EE_|AM8PR10MB4097:EE_ X-MS-Office365-Filtering-Correlation-Id: 32fd07d4-1f22-4a25-9503-08dab33c8e9d 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:194.138.21.75; CTRY:DE; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:hybrid.siemens.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230022)(4636009)(39860400002)(396003)(376002)(136003)(346002)(451199015)(40470700004)(46966006)(36840700001)(186003)(2906002)(336012)(16526019)(2616005)(1076003)(956004)(5660300002)(26005)(41300700001)(8936002)(356005)(81166007)(86362001)(82740400003)(40460700003)(82960400001)(40480700001)(82310400005)(83380400001)(36756003)(36860700001)(47076005)(34020700004)(66899015)(110136005)(316002)(4326008)(8676002)(6666004)(478600001)(54906003)(70206006)(70586007)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Oct 2022 08:16:29.7510 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 32fd07d4-1f22-4a25-9503-08dab33c8e9d X-MS-Exchange-CrossTenant-Id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=38ae3bcd-9579-4fd4-adda-b42e1495d55a; Ip=[194.138.21.75]; Helo=[hybrid.siemens.com] X-MS-Exchange-CrossTenant-AuthSource: HE1EUR01FT015.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR10MB4097 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Benedikt Niedermayr Currently it is not possible to configure the WAIT0PINPOLARITY and WAIT1PINPOLARITY bits of the GPMC_CONFIG register directly via device tree properties. It is also not possible to use the same wait-pin for different cs-regions. While the current implementation may fullfill most usecases, it may not be sufficient for more complex setups (e.g. FPGA/ASIC interfaces), where more complex interfacing options where possible. For example interfacing an ASIC which offers multiple cs-regions but only one waitpin the current driver and dt-bindings are not sufficient. While using the same waitpin for different cs-regions worked for older kernels (4.14) the omap-gpmc.c driver refused to probe (-EBUSY) with newer kernels (>5.10). Changes since v1: * Rebase against recent 6.0.0-rc3 kernel * Updated eMail recipients list Changes since v2: * Remove the gpmc register configuration out of the gpiochip callbacks. In this case the memory interface configuration is not done via gpio bindings. * Some minor code fixes * Changed git commit descriptions Change since v3: * Use a uint32 dt-property instean a boolean one * If the dt-property is not set, then don't touch the GPMC_CONFIG register * Changed git commit descriptions Changes since v4: * Use checkpatch with "--strict" option * Moved wait-pin sanity checks to gpmc_read_settings_dt() * Always assign WAITPINPOLARITY_DEFAULT on error cases * Track waitpin allocation within gpmc for determine allocation origin Changes since v5: * Tracking of wait-pin allocations with polarity change detection * Introduced a new struct gpmc_waitpin * Add GPMC_* to global header definitions * Don't allow GPMC_WAITPINPOLARITY_DEFAULT when parsing dt-properties * Squashed wait-pin-polarity and shared-wait-pin patches, since they should not be separated Changes since v6: * Move wait-pin allocation into gpmc_probe() * Fix s/gpmc/GPMC/ in commit description * use ti,wait-pin-polarity instead of gpmc,wait-pin-polarity * Refactored if clause in gpmc_alloc_waitpin() * Revert values for GPMC_WAITPINPOLARITY_ACTIVE_LOW and GPMC_WAITPINPOLARITY_ACTIVE_HIGH. Use the exact same values which are written into the register. Changes since v7: * Renamed GPMC_WAITPINPOLARITY_DEFAULT to GPMC_WAITPINPOLARITY_INVALID * Call gpiochip_request_own_desc() only on first wait-pin allocation * Fixed use of old "gpmc,wait-pin-polarity" property. Benedikt Niedermayr (2): memory: omap-gpmc: wait pin additions dt-bindings: memory-controllers: gpmc-child: add wait-pin polarity .../memory-controllers/ti,gpmc-child.yaml | 7 + drivers/memory/omap-gpmc.c | 122 ++++++++++++++++-- include/linux/platform_data/gpmc-omap.h | 8 ++ 3 files changed, 124 insertions(+), 13 deletions(-) Reviewed-by: Roger Quadros Reviewed-by: Roger Quadros --- 2.25.1