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Fri, 26 Jan 2024 17:28:37 +0000 Received: from VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::d4b1:cea8:7085:ec50]) by VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::d4b1:cea8:7085:ec50%4]) with mapi id 15.20.7228.027; Fri, 26 Jan 2024 17:28:37 +0000 From: Farouk Bouabid Date: Fri, 26 Jan 2024 18:27:45 +0100 Subject: [PATCH v5 4/6] serial: 8250: set rx-enable gpio state when rs485 is disabled Message-Id: <20240126-dev-rx-enable-v5-4-5d934eda05ca@theobroma-systems.com> References: <20240126-dev-rx-enable-v5-0-5d934eda05ca@theobroma-systems.com> In-Reply-To: <20240126-dev-rx-enable-v5-0-5d934eda05ca@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: VE1PR03CA0003.eurprd03.prod.outlook.com (2603:10a6:802:a0::15) To VE1PR04MB6382.eurprd04.prod.outlook.com (2603:10a6:803:122::31) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR04MB6382:EE_|DB9PR04MB9820:EE_ X-MS-Office365-Filtering-Correlation-Id: 304068e2-a041-46b0-d5d1-08dc1e943a44 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This defines the state of RE or DE/RE signal when em485 is disabled. Signed-off-by: Farouk Bouabid --- drivers/tty/serial/8250/8250_port.c | 4 ++++ drivers/tty/serial/serial_core.c | 6 +++++- include/linux/serial_core.h | 1 + 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 54d8f809b81e..fbd0212d2397 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -582,12 +582,16 @@ static int serial8250_em485_init(struct uart_8250_port *p) */ void serial8250_em485_destroy(struct uart_8250_port *p) { + struct uart_port *port = &p->port; + if (!p->em485) return; hrtimer_cancel(&p->em485->start_tx_timer); hrtimer_cancel(&p->em485->stop_tx_timer); + gpiod_set_value(port->rs485_re_gpio, !port->rs485_re_gpio_inactive_when_rs485_disabled); + kfree(p->em485); p->em485 = NULL; } diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 8067d20c5275..abcba88dd5a7 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3663,7 +3663,11 @@ int uart_get_rs485_mode(struct uart_port *port) if (port->rs485_rx_during_tx_gpio) port->rs485_supported.flags |= SER_RS485_RX_DURING_TX; - port->rs485_re_gpio = devm_gpiod_get_optional(dev, "rs485-rx-enable", GPIOD_OUT_HIGH); + port->rs485_re_gpio_inactive_when_rs485_disabled = device_property_read_bool(dev, + "rs485-rx-enable-inactive-when-rs485-disabled"); + + port->rs485_re_gpio = devm_gpiod_get_optional(dev, "rs485-rx-enable", + port->rs485_re_gpio_inactive_when_rs485_disabled ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH); if (IS_ERR(port->rs485_re_gpio)) { ret = PTR_ERR(port->rs485_re_gpio); port->rs485_re_gpio = NULL; diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 364583203a24..fa5a92b56360 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -585,6 +585,7 @@ struct uart_port { struct gpio_desc *rs485_term_gpio; /* enable RS485 bus termination */ struct gpio_desc *rs485_rx_during_tx_gpio; /* Output GPIO that sets the state of RS485 RX during TX */ struct gpio_desc *rs485_re_gpio; /* gpio RS485 receive enable */ + bool rs485_re_gpio_inactive_when_rs485_disabled; struct serial_iso7816 iso7816; void *private_data; /* generic platform data pointer */ };