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Niedermayr" To: , CC: , , , Subject: [PATCH v4 1/3] memory: omap-gpmc: allow shared wait pins Date: Thu, 15 Sep 2022 11:13:31 +0200 Message-ID: <20220915091333.2425306-2-benedikt.niedermayr@siemens.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220915091333.2425306-1-benedikt.niedermayr@siemens.com> References: <20220915091333.2425306-1-benedikt.niedermayr@siemens.com> MIME-Version: 1.0 X-Originating-IP: [144.145.220.66] X-ClientProxiedBy: DEMCHDC8A0A.ad011.siemens.net (139.25.226.106) To DEMCHDC8A0A.ad011.siemens.net (139.25.226.106) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1EUR01FT046:EE_|DU0PR10MB7406:EE_ X-MS-Office365-Filtering-Correlation-Id: 6f66d9f4-644e-43b7-8527-08da96fa96e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: +YGGJuAszXpUO8v23N+1RaBV9YixgPPsDUWFPexKOsJ6/LPtiUAUwZBa5uP2aaWqheSFKoqRA3vXpgpxTBcY6K/hyXIJ0agN4FBFRfC6ZKh/2Z3nisc+HNaWl/977Ypw1LVyUHo2LOD/lkEwU4hnHq+cLirnUDOMsjsCkFhxo7yMbkX8xI4tcYTIr784C99hO8/Bunis7YDbWAS03SIGmBih9IRRyZl9sPmws5NFcmjB9FLhzTSKee8lD6hpkX88H7inuhPIV18WlzDUSFOiFyXCVpFWAOinbizM9y1ExBw9YTAIxUC91Yxc7FOF7LOT0azCsLPW8pB2CmaUBhXIoLJ20Vx1PQkP+ffkBNG9cjEwaD7qAuU1w2swtaLTYYPs8W+C4uH2BcjL/awnkdNtP8Qt65uEicJFK5yIbuiq4DmoBbHEKRi83+ZQhnXiphj8vO2Coz7CjZpIh379Nko5e0jqhGjdWotWQ5t/dEvnLYi7p57c+uIkWOb1UJhylah1se1/zoyPp3Q2q4VBxcTeWzAmC01AoXx32jxCpJdBamOFgKOdq7WaRjujfvRqjHut3cjLNZpKsSv2KBJrjkuYvZbg3O6UlipBDrP30mQfCHoYvqqcoMsYUmAk76xN5mZSudySUWPRJolu5LeQwffsBCexL/Fip9+vppwTJjQcUfpXwNNZeBkQS4xnKA4kOTzA9Mr+rLmtH+Eyk0HpkUO+Jvprrsvw92TWQ191s2AXRAbH5Fe1/X8CfiV5eWTWuntn86YWjQMVj0kx9DCVmYamDcMR76hIXLa8k+EDii6d2FK99lsQMq/mqjS++qLcC4Xc 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)(346002)(39860400002)(136003)(376002)(396003)(451199015)(36840700001)(46966006)(40470700004)(478600001)(8676002)(316002)(1076003)(40460700003)(6666004)(47076005)(110136005)(83380400001)(70206006)(336012)(16526019)(956004)(2616005)(40480700001)(36860700001)(36756003)(4326008)(356005)(5660300002)(186003)(82740400003)(41300700001)(86362001)(82960400001)(26005)(54906003)(2906002)(82310400005)(8936002)(81166007)(70586007)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2022 09:13:44.3688 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6f66d9f4-644e-43b7-8527-08da96fa96e8 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: VE1EUR01FT046.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR10MB7406 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Benedikt Niedermayr Newer kernels refuse to probe when using the same wait pin for different chipselect regions. But this may be a usecase when connecting for example FPGA or ASIC modules to the gpmc, which only got one wait pin installed. Signed-off-by: Benedikt Niedermayr --- drivers/memory/omap-gpmc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c index d9bf1c2ac319..e3674a15b934 100644 --- a/drivers/memory/omap-gpmc.c +++ b/drivers/memory/omap-gpmc.c @@ -2221,9 +2221,13 @@ static int gpmc_probe_generic_child(struct platform_device *pdev, GPIO_ACTIVE_HIGH, GPIOD_IN); if (IS_ERR(waitpin_desc)) { - dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin); ret = PTR_ERR(waitpin_desc); - goto err; + if (ret == -EBUSY) { + dev_info(&pdev->dev, "shared wait-pin: %d\n", wait_pin); + } else { + dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin); + goto err; + } } } From patchwork Thu Sep 15 09:13:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "B. 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The current properties do not allow this configuration. This binding directly configures the WAITPINPOLARITY bit in the GPMC_CONFIG register by setting the gpmc,wait-pin-polarity dt-property. Signed-off-by: Benedikt Niedermayr --- .../bindings/memory-controllers/ti,gpmc-child.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/memory-controllers/ti,gpmc-child.yaml b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc-child.yaml index 6e3995bb1630..8e541acdb1ff 100644 --- a/Documentation/devicetree/bindings/memory-controllers/ti,gpmc-child.yaml +++ b/Documentation/devicetree/bindings/memory-controllers/ti,gpmc-child.yaml @@ -230,6 +230,13 @@ properties: Wait-pin used by client. Must be less than "gpmc,num-waitpins". $ref: /schemas/types.yaml#/definitions/uint32 + gpmc,wait-pin-polarity: + description: | + Set the desired polarity for the selected wait pin. + 0 for active low, 1 for active high. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + gpmc,wait-on-read: description: Enables wait monitoring on reads. type: boolean