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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8E0EC43331 for ; Wed, 25 Mar 2020 23:15:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8FD292076A for ; Wed, 25 Mar 2020 23:15:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbgCYXPE (ORCPT ); Wed, 25 Mar 2020 19:15:04 -0400 Received: from gloria.sntech.de ([185.11.138.130]:40172 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727549AbgCYXOm (ORCPT ); Wed, 25 Mar 2020 19:14:42 -0400 Received: from ip5f5a5d2f.dynamic.kabel-deutschland.de ([95.90.93.47] helo=phil.sntech) by gloria.sntech.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1jHFEH-0007ug-Q3; Thu, 26 Mar 2020 00:14:33 +0100 From: Heiko Stuebner To: gregkh@linuxfoundation.org Cc: jslaby@suse.com, andriy.shevchenko@linux.intel.com, matwey.kornilov@gmail.com, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, heiko@sntech.de, lukas@wunner.de, christoph.muellner@theobroma-systems.com, giulio.benetti@micronovasrl.com, Sascha Weisenberger , Jan Kiszka , Heiko Stuebner Subject: [PATCH DON'T APPLY v2 2/7] dt-bindings: serial: Add binding for rs485 bus termination GPIO Date: Thu, 26 Mar 2020 00:14:17 +0100 Message-Id: <20200325231422.1502366-3-heiko@sntech.de> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200325231422.1502366-1-heiko@sntech.de> References: <20200325231422.1502366-1-heiko@sntech.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lukas Wunner Commit e8759ad17d41 ("serial: uapi: Add support for bus termination") introduced the ability to enable rs485 bus termination from user space. So far the feature is only used by a single driver, 8250_exar.c, using a hardcoded GPIO pin specific to Siemens IOT2040 products. Provide for a more generic solution by allowing specification of an rs485 bus termination GPIO pin in the device tree. An upcoming commit implements support for this pin for any 8250 driver. The binding is used in device trees of the "Revolution Pi" PLCs offered by KUNBUS. Signed-off-by: Lukas Wunner Cc: Sascha Weisenberger Cc: Jan Kiszka [moved to yaml rs485 binding] Signed-off-by: Heiko Stuebner --- Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml index d4beaf11222d..a9ad17864889 100644 --- a/Documentation/devicetree/bindings/serial/rs485.yaml +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -43,3 +43,7 @@ properties: rs485-rx-during-tx: description: enables the receiving of data even while sending data. $ref: /schemas/types.yaml#/definitions/flag + + rs485-term-gpios: + description: GPIO pin to enable RS485 bus termination. + maxItems: 1 -- 2.24.1