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Fri, 26 Jan 2024 14:58:25 +0000 Received: from AM0PR04MB6371.eurprd04.prod.outlook.com ([fe80::e130:6c40:23e5:9a8f]) by AM0PR04MB6371.eurprd04.prod.outlook.com ([fe80::e130:6c40:23e5:9a8f%5]) with mapi id 15.20.7228.022; Fri, 26 Jan 2024 14:58:25 +0000 From: Farouk Bouabid Date: Fri, 26 Jan 2024 15:55:12 +0100 Subject: [PATCH v4 3/6] dt-bindings: serial: add binding for rs485 rx-enable state when rs485 is disabled Message-Id: <20240126-dev-rx-enable-v4-3-45aaf4d96328@theobroma-systems.com> References: <20240126-dev-rx-enable-v4-0-45aaf4d96328@theobroma-systems.com> In-Reply-To: <20240126-dev-rx-enable-v4-0-45aaf4d96328@theobroma-systems.com> To: Greg Kroah-Hartman , Jiri Slaby , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Heiko Stuebner Cc: Rob Herring , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, quentin.schulz@theobroma-systems.com, Farouk Bouabid X-Mailer: b4 0.12.3 X-ClientProxiedBy: VI1PR06CA0114.eurprd06.prod.outlook.com (2603:10a6:803:8c::43) To AM0PR04MB6371.eurprd04.prod.outlook.com (2603:10a6:208:178::19) Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM0PR04MB6371:EE_|GVXPR04MB9735:EE_ X-MS-Office365-Filtering-Correlation-Id: df1b6018-3cd0-45d5-c165-08dc1e7f3f68 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?LcPkiJ3QfUykiBoK7uTqzLAKYZ/n?= =?utf-8?q?lZzK+fTGCcB1nG15twQy780xN8gq82DKtP+Ae4djecEpXmv4LNQhxnyxFwZdh7aGS?= =?utf-8?q?XXUcaHqF1NeXkoh4UXNB3tUxEAQN6HItSFLazWXyUQEwwakDVQpPqLOTiSHgWG/Y+?= =?utf-8?q?9kctQBJylScAZy8h6SDq+Mp9YlUuaUWNOc0Lew+rQvKTLWxmDe8rgICfoPz7tMz/A?= =?utf-8?q?I2bCg9N48lu/yjI5EMP7QTDJpYgROR5umpPJrwFIUpuRHFb++EvBzrSkjQTTjT0tX?= =?utf-8?q?0vuTEVkJ1U0O2H2GxLZ7fCWoP8cUZ/l+NRake0HIGnr5PeWFtLVpeX8/etzTVrihj?= =?utf-8?q?2OzAs2+6YpW7Yd8BTQhLyuIgT+ro4UXfrl8+nUrAf4ts3I14GONs6GwlF1bTVr+KH?= =?utf-8?q?92LdtwHyvwNb0y4218n49GEU+Xcg8OygKZ06KgorDmoqm+p/13lzOvjk6oTxwcqVc?= =?utf-8?q?IbX06IYjsUFuuKiSaSh7FEa0Y0rWKVyPF3hTJZw8u0+S5kMG83rZcDVu5NNd8Dsv1?= =?utf-8?q?51iX3f16M9rMjMPE/TC7nCogzO3TTnDp7XhtC1BUuOaTNkmWP+3ciai7Is0xG0R3R?= =?utf-8?q?gfU+jjbe/gUnlgdNcDiZiMitzJGXi7yzP/42dK2odZeSR3XXZbelpEex6SN7RV1iC?= =?utf-8?q?Xgyff94IiKix6Dq1hqmA3ESO0Zc94TeU771wClYqoQooVoBKdsohOToHAlrUA4FQT?= =?utf-8?q?voGIY0ursP4Q7Y6dKKIkg76xqp23u9wcanHCcm0oO3NIxwVGJWb25qSPuNi1YgfVV?= =?utf-8?q?t254nrcarcDI5Kmcc3BfAehW56B8lJtS+5m50GdRk9Bzt/cjTsxiv4rC0rhS8pwer?= =?utf-8?q?fPivGqzaaSP6EtKfQwViD91BDgyx1uPofRqp9XL40gQXBN5UTLHMmJUjm31EKfhed?= =?utf-8?q?FZaLr2SY3rY3tLx+YDV7sBxvI/YjFmj3wtSUmapSz3KEMlh+AldA2oU3y5cXW1us4?= =?utf-8?q?fSx5Zg5ktr/bIP5QQQo0VsiwWuAGcm0C/OyCcZ8L9BXE+HZegoUdP81LXyVRLKevj?= =?utf-8?q?k9cViFvGejrGm4m0C87koNAiD2wf7rv4Nuu61m5BGYEIF/ceTkH9yvprXzoNqfB3L?= =?utf-8?q?yBFeYNx1YrCMiVku58rTDdlIKE8U+TymLpWfL1C/k3pzJegDH3si72ZUOQp186QRZ?= =?utf-8?q?Leu42bpdvy64NJWKwNym/KjHb268R6f4kKfV6CcQNKrMYSkgqCSpPmUX32syPzkkw?= =?utf-8?q?A0atu96r+tIUMxZ1nXZmdZYDTMo/QRaBMh17W0i6o/rJOkd6KGzD6f41ajr03nHQj?= =?utf-8?q?5/MjFU+rDR+Tuge9EHf+lxZ0yiGHqt6y3137Pd6vgSORJAxQn0wgrUcyS5ysg61qY?= =?utf-8?q?BuHMFH2UxUMPJsFgXyeMI83TRc2gb2y90YLpW6NgUc9RFMNGDDFb89T+4YCXL3CUI?= =?utf-8?q?1AeZUwi55A1FyTI9bAhM8mMh3aCdsYGZOoEVxymMlFYHhGCZvxDW0SEbQgu05qux3?= =?utf-8?q?EVKWM4w6C6+1Q9Q+5pJlZ/wSQhOsDp/m8Nk3HqrZ2yb0hGxxJLaHK7OYYxzJsIqLY?= =?utf-8?q?4wOc1yhchpx8oAX+jChJ7450W2rwfKdPN/IZpXr8JxCgqBPcOr0Z2Vc=3D?= X-OriginatorOrg: theobroma-systems.com X-MS-Exchange-CrossTenant-Network-Message-Id: df1b6018-3cd0-45d5-c165-08dc1e7f3f68 X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB6371.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jan 2024 14:58:25.4797 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5e0e1b52-21b5-4e7b-83bb-514ec460677e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: YZj1cWrQOCZ4I6/7k/hdG9QO6+5QHOcATmlcFutOexe5gT9XmRucMRRbBAWYhtpREHegI4WdRna072iQCtXBZWfPr0ja4hARFgxNScK8G+P0wbHHLEShliWOt/KF14QF X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR04MB9735 RS485 can have a receiver-enable gpio (rx-enable-gpios). When rs485 is enabled, this gpio, if provided, must be driven active while receiving. However when RS485 is disabled this gpio should not have an undefined state. In that case, as DE and RE pins can be connected both to this gpio, if its state is not properly defined, can cause unexpected transceiver behavior. This binding depend on rx-enable-gpios to be implemented. Signed-off-by: Farouk Bouabid --- Documentation/devicetree/bindings/serial/rs485.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml index b64577036b5c..4c79dfaaf460 100644 --- a/Documentation/devicetree/bindings/serial/rs485.yaml +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -55,6 +55,11 @@ properties: description: GPIO to handle a separate RS485 receive enable signal maxItems: 1 + rs485-rx-enable-inactive-when-rs485-disabled: + description: rx-enable GPIO is not active when RS485 is disabled. If missing, active-state + is assumed. + $ref: /schemas/types.yaml#/definitions/flag + rs485-term-gpios: description: GPIO pin to enable RS485 bus termination. maxItems: 1