From patchwork Thu Dec 1 11:02:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Niedermaier X-Patchwork-Id: 630172 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2BCE9C4321E for ; Thu, 1 Dec 2022 11:50:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230175AbiLALu0 (ORCPT ); Thu, 1 Dec 2022 06:50:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230465AbiLALuX (ORCPT ); Thu, 1 Dec 2022 06:50:23 -0500 Received: from mx2.securetransport.de (mx2.securetransport.de [188.68.39.254]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 240AA9AE04 for ; Thu, 1 Dec 2022 03:50:20 -0800 (PST) Received: from mail.dh-electronics.com (unknown [77.24.89.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx2.securetransport.de (Postfix) with ESMTPSA id 8C6CD5EA83; Thu, 1 Dec 2022 12:49:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dh-electronics.com; s=dhelectronicscom; t=1669895363; bh=q++aMqT8Oud2A2Zv20gglvjrODW/2aUDXXQe4X+End0=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=iTBqhgJd8/2BlFGJh87GoNpoUymU6kPlgEESJ7X2S2XDyfyTmFgO44aKQhu2Zmf56 zLhVjT76wub9E6n8+wWHr6C8Ul4ztKk3l/MCMf8pqwA2j8u8iudNJOePDeZVqvmJzq oYH5Bo1oLwJFfpGc2fAdgF/Vd8xx/DZqRjd8HKdPsW9CjpgvndXG7R+gRYeOQYHjEv NDYywlXJFSlZBsLD6XlHLXUv6UiIhMsjS33UyVhDgfGj2E2xHzpTXHO/RoYN7khp2r 2CzMRBLzxl0m8exW58ec+FP1j4tBra6zP6mF84zrErb/B9iB8MhaQv3M1XBF+T6j0F D2ewVRtb6PAyQ== Received: from DHPWEX01.DH-ELECTRONICS.ORG (10.64.2.30) by DHPWEX01.DH-ELECTRONICS.ORG (10.64.2.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.20; Thu, 1 Dec 2022 12:03:58 +0100 Received: from localhost.localdomain (172.16.51.2) by DHPWEX01.DH-ELECTRONICS.ORG (10.64.2.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.20 via Frontend Transport; Thu, 1 Dec 2022 12:03:58 +0100 From: Christoph Niedermaier To: , CC: , , , Christoph Niedermaier , Greg Kroah-Hartman , Maxime Coquelin , Alexandre Torgue , Alexander Dahl , , Subject: [PATCH V3 4/4] serial: stm32: Add support for rs485 RX_DURING_TX output GPIO Date: Thu, 1 Dec 2022 12:02:37 +0100 Message-ID: <20221201110237.7917-4-cniedermaier@dh-electronics.com> X-Mailer: git-send-email 2.11.0 X-klartext: yes In-Reply-To: <20221201110237.7917-1-cniedermaier@dh-electronics.com> References: <20221201110237.7917-1-cniedermaier@dh-electronics.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org If a RX_DURING_TX GPIO is defined by the DT property "rs485-rx-during-tx-gpios" this patch switches this GPIO accordingly to the RS485 flag RX_DURING_TX in user space. Controlled by this GPIO, now the hardware is responsible for connecting or disconnecting RX during TX. Signed-off-by: Christoph Niedermaier --- Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Maxime Coquelin Cc: Alexandre Torgue Cc: Alexander Dahl Cc: Marek Vasut Cc: kernel@dh-electronics.com Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-serial@vger.kernel.org To: linux-arm-kernel@lists.infradead.org --- V2: - Rework of the commit message V3: - No changes --- drivers/tty/serial/stm32-usart.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index a1490033aa16..0f2cca9054ba 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -226,7 +226,14 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit)); - rs485conf->flags |= SER_RS485_RX_DURING_TX; + if (port->rs485_rx_during_tx_gpio) { + if (rs485conf->flags & SER_RS485_RX_DURING_TX) + gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, 1); + else + gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, 0); + } else { + rs485conf->flags |= SER_RS485_RX_DURING_TX; + } if (rs485conf->flags & SER_RS485_ENABLED) { cr1 = readl_relaxed(port->membase + ofs->cr1);