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Niedermayr" To: , CC: , , , Subject: [PATCH 0/3] omap-gpmc wait pin additions Date: Thu, 1 Sep 2022 14:41:41 +0200 Message-ID: <20220901124144.1006238-1-benedikt.niedermayr@siemens.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [139.23.126.196] X-ClientProxiedBy: DEMCHDC89XA.ad011.siemens.net (139.25.226.103) To DEMCHDC8WAA.ad011.siemens.net (139.25.226.104) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cd8bc45e-c09a-4925-df7e-08da8c17613e X-MS-TrafficTypeDiagnostic: VI1PR10MB3678:EE_ 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:194.138.21.74;CTRY:DE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:hybrid.siemens.com;PTR:hybrid.siemens.com;CAT:NONE;SFS:(13230016)(4636009)(346002)(396003)(136003)(376002)(39860400002)(46966006)(36840700001)(40470700004)(70206006)(8936002)(5660300002)(40480700001)(70586007)(8676002)(36756003)(2906002)(4326008)(316002)(54906003)(110136005)(478600001)(82310400005)(82960400001)(41300700001)(356005)(26005)(83380400001)(47076005)(86362001)(1076003)(186003)(6666004)(336012)(16526019)(7636003)(7596003)(2616005)(956004)(82740400003)(40460700003)(36860700001);DIR:OUT;SFP:1101; X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2022 12:42:06.9368 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd8bc45e-c09a-4925-df7e-08da8c17613e X-MS-Exchange-CrossTenant-Id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=38ae3bcd-9579-4fd4-adda-b42e1495d55a;Ip=[194.138.21.74];Helo=[hybrid.siemens.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR01FT084.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR10MB3678 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Benedikt Niedermayr There is currently no possibility for the gpmc to set either the waitp-pin polarity or 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). Benedikt Niedermayr (3): memory: omap-gpmc: allow shared wait pins memory: omap-gpmc: add support for wait pin polarity dt-bindings: memory-controllers: gpmc-child: Add binding for wait-pin-polarity .../memory-controllers/ti,gpmc-child.yaml | 7 ++++ drivers/memory/omap-gpmc.c | 38 +++++++++++++++---- include/linux/platform_data/gpmc-omap.h | 1 + 3 files changed, 39 insertions(+), 7 deletions(-)