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Tue, 24 Oct 2023 09:48:56 -0500 From: Manikanta Guntupalli To: , , , , , , , , , , CC: , , , , Manikanta Guntupalli Subject: [PATCH V3 1/2] dt-bindings: Add optional gpio property to uartps node to support rs485 Date: Tue, 24 Oct 2023 20:18:46 +0530 Message-ID: <20231024144847.2316941-2-manikanta.guntupalli@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231024144847.2316941-1-manikanta.guntupalli@amd.com> References: <20231024144847.2316941-1-manikanta.guntupalli@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D0:EE_|IA0PR12MB7776:EE_ X-MS-Office365-Filtering-Correlation-Id: e958edec-5d50-41b5-c5f9-08dbd4a05caa 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:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(346002)(396003)(376002)(136003)(39860400002)(230922051799003)(82310400011)(64100799003)(1800799009)(451199024)(186009)(36840700001)(46966006)(40470700004)(2906002)(7416002)(8676002)(8936002)(4326008)(44832011)(83380400001)(966005)(81166007)(356005)(82740400003)(41300700001)(5660300002)(47076005)(6666004)(86362001)(40480700001)(316002)(110136005)(336012)(426003)(1076003)(26005)(478600001)(921008)(2616005)(36756003)(70586007)(70206006)(40460700003)(54906003)(36860700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Oct 2023 14:49:01.6671 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e958edec-5d50-41b5-c5f9-08dbd4a05caa X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9D0.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7776 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add optional gpio property to uartps node and reference to rs485.yaml On Xilinx/AMD Kria SOM KD240 board rs485 connects via TI ISOW1432 Transceiver device, where one GPIO is used for driving DE/RE signals. With rs485 half duplex configuration, DE and RE are shorted to each other, and at a time, any node acts as either a driver or a receiver. Here, DE - Driver enable. If pin is floating, driver is disabled. RE - Receiver enable. If pin is floating, receiver buffer is disabled. For more deatils, please find below link which contains Transceiver device(ISOW1432) datasheet https://www.ti.com/lit/ds/symlink/isow1432.pdf?ts=1682607122706&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FISOW1432%252Fpart-details%252FISOW1432DFMR%253FkeyMatch%253DISOW1432DFMR%2526tisearch%253Dsearch-everything%2526usecase%253DOPN rts-gpios is optional property, because it is not required for uart console node. Signed-off-by: Manikanta Guntupalli --- Changes for V2: Modify optional gpio name to xlnx,phy-ctrl-gpios. Update commit description. Changes for V3: Modify optional gpio name to rts-gpios. Update commit description. --- Documentation/devicetree/bindings/serial/cdns,uart.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/cdns,uart.yaml b/Documentation/devicetree/bindings/serial/cdns,uart.yaml index e35ad1109efc..7ee305f9a45f 100644 --- a/Documentation/devicetree/bindings/serial/cdns,uart.yaml +++ b/Documentation/devicetree/bindings/serial/cdns,uart.yaml @@ -46,6 +46,11 @@ properties: power-domains: maxItems: 1 + rts-gpios: + description: Optional GPIO to control transmit/receive on RS485 phy + in halfduplex mode. + maxItems: 1 + required: - compatible - reg @@ -55,6 +60,7 @@ required: allOf: - $ref: serial.yaml# + - $ref: rs485.yaml# - if: properties: compatible: -- 2.25.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 36849C07545 for ; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add optional gpio property to uartps node and reference to rs485.yaml On Xilinx/AMD Kria SOM KD240 board rs485 connects via TI ISOW1432 Transceiver device, where one GPIO is used for driving DE/RE signals. With rs485 half duplex configuration, DE and RE are shorted to each other, and at a time, any node acts as either a driver or a receiver. Here, DE - Driver enable. If pin is floating, driver is disabled. RE - Receiver enable. If pin is floating, receiver buffer is disabled. For more deatils, please find below link which contains Transceiver device(ISOW1432) datasheet https://www.ti.com/lit/ds/symlink/isow1432.pdf?ts=1682607122706&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FISOW1432%252Fpart-details%252FISOW1432DFMR%253FkeyMatch%253DISOW1432DFMR%2526tisearch%253Dsearch-everything%2526usecase%253DOPN rts-gpios is optional property, because it is not required for uart console node. Signed-off-by: Manikanta Guntupalli --- Changes for V2: Modify optional gpio name to xlnx,phy-ctrl-gpios. Update commit description. Changes for V3: Modify optional gpio name to rts-gpios. Update commit description. --- Documentation/devicetree/bindings/serial/cdns,uart.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/cdns,uart.yaml b/Documentation/devicetree/bindings/serial/cdns,uart.yaml index e35ad1109efc..7ee305f9a45f 100644 --- a/Documentation/devicetree/bindings/serial/cdns,uart.yaml +++ b/Documentation/devicetree/bindings/serial/cdns,uart.yaml @@ -46,6 +46,11 @@ properties: power-domains: maxItems: 1 + rts-gpios: + description: Optional GPIO to control transmit/receive on RS485 phy + in halfduplex mode. + maxItems: 1 + required: - compatible - reg @@ -55,6 +60,7 @@ required: allOf: - $ref: serial.yaml# + - $ref: rs485.yaml# - if: properties: compatible: -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel