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Niedermayr" To: , CC: , , , Subject: [PATCH v3 0/3] omap-gpmc wait pin additions Date: Tue, 6 Sep 2022 14:47:47 +0200 Message-ID: <20220906124747.1767318-6-benedikt.niedermayr@siemens.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220906124747.1767318-1-benedikt.niedermayr@siemens.com> References: <20220906124747.1767318-1-benedikt.niedermayr@siemens.com> MIME-Version: 1.0 X-Originating-IP: [139.23.126.196] X-ClientProxiedBy: DEMCHDC89XA.ad011.siemens.net (139.25.226.103) To DEMCHDC8A0A.ad011.siemens.net (139.25.226.106) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2d05fdfd-429e-4644-20fc-08da90060a2a X-MS-TrafficTypeDiagnostic: AS4PR10MB5872: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:194.138.21.75; CTRY:DE; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:hybrid.siemens.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230016)(4636009)(346002)(39860400002)(396003)(136003)(376002)(36840700001)(46966006)(40470700004)(336012)(186003)(478600001)(36860700001)(6666004)(956004)(83380400001)(16526019)(1076003)(2616005)(26005)(47076005)(40480700001)(4326008)(5660300002)(40460700003)(70586007)(70206006)(86362001)(41300700001)(8936002)(2906002)(81166007)(82740400003)(82960400001)(36756003)(8676002)(356005)(54906003)(82310400005)(316002)(110136005)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Sep 2022 12:48:03.9989 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2d05fdfd-429e-4644-20fc-08da90060a2a 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: HE1EUR01FT037.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS4PR10MB5872 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, but the maintainers list stays the same! * Updated eMail recipients list * 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 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 wait-pin polarity .../memory-controllers/ti,gpmc-child.yaml | 6 ++++ drivers/memory/omap-gpmc.c | 36 +++++++++++++++---- include/linux/platform_data/gpmc-omap.h | 1 + 3 files changed, 36 insertions(+), 7 deletions(-)