linux-kernel - [PATCH v1 1/1] serial: core: Simplify uart_get_rs485

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Message-Id: <20231003142346.3072929-1-andriy.shevchenko@linux.intel.com>
Date:   Tue,  3 Oct 2023 17:23:46 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] serial: core: Simplify uart_get_rs485_mode()

Simplify uart_get_rs485_mode() by using temporary variable for
the GPIO descriptor. With that, use proper type for the flags
of the GPIO descriptor.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/tty/serial/serial_core.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b32bbd7aa3d3..70bf2bec875c 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3559,9 +3559,10 @@ int uart_get_rs485_mode(struct uart_port *port)
 {
 	struct serial_rs485 *rs485conf = &port->rs485;
 	struct device *dev = port->dev;
+	enum gpiod_flags dflags;
+	struct gpio_desc *desc;
 	u32 rs485_delay[2];
 	int ret;
-	int rx_during_tx_gpio_flag;
 
 	ret = device_property_read_u32_array(dev, "rs485-rts-delay",
 					     rs485_delay, 2);
@@ -3600,26 +3601,19 @@ int uart_get_rs485_mode(struct uart_port *port)
 	 * bus participants enable it, no communication is possible at all.
 	 * Works fine for short cables and users may enable for longer cables.
 	 */
-	port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term",
-							GPIOD_OUT_LOW);
-	if (IS_ERR(port->rs485_term_gpio)) {
-		ret = PTR_ERR(port->rs485_term_gpio);
-		port->rs485_term_gpio = NULL;
-		return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n");
-	}
+	desc = devm_gpiod_get_optional(dev, "rs485-term", GPIOD_OUT_LOW);
+	if (IS_ERR(desc))
+		return dev_err_probe(dev, PTR_ERR(desc), "Cannot get rs485-term-gpios\n");
+	port->rs485_term_gpio = desc;
 	if (port->rs485_term_gpio)
 		port->rs485_supported.flags |= SER_RS485_TERMINATE_BUS;
 
-	rx_during_tx_gpio_flag = (rs485conf->flags & SER_RS485_RX_DURING_TX) ?
-				 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
-	port->rs485_rx_during_tx_gpio = devm_gpiod_get_optional(dev,
-								"rs485-rx-during-tx",
-								rx_during_tx_gpio_flag);
-	if (IS_ERR(port->rs485_rx_during_tx_gpio)) {
-		ret = PTR_ERR(port->rs485_rx_during_tx_gpio);
-		port->rs485_rx_during_tx_gpio = NULL;
-		return dev_err_probe(dev, ret, "Cannot get rs485-rx-during-tx-gpios\n");
-	}
+	dflags = (rs485conf->flags & SER_RS485_RX_DURING_TX) ?
+		 GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
+	desc = devm_gpiod_get_optional(dev, "rs485-rx-during-tx", dflags);
+	if (IS_ERR(desc))
+		return dev_err_probe(dev, PTR_ERR(desc), "Cannot get rs485-rx-during-tx-gpios\n");
+	port->rs485_rx_during_tx_gpio = desc;
 
 	return 0;
 }
-- 
2.40.0.1.gaa8946217a0b