[PATCH v2 1/3] tty: Introduce UART_CAP_HW485

[Matwey V. Kornilov]

Introduce new capability UART_CAP_HW485 to mark 8250 UARTs which have
hardware support of line direction control.

Signed-off-by: Matwey V. Kornilov <matwey@xxxxxxxxxx>
---
Changes since v1:
 - Commit message has been wrapped

 drivers/tty/serial/8250/8250.h         | 1 +
 drivers/tty/serial/8250/8250_fintek.c  | 1 +
 drivers/tty/serial/8250/8250_lpc18xx.c | 1 +
 drivers/tty/serial/8250/8250_pci.c     | 1 +
 4 files changed, 4 insertions(+)

diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index d54dcd8..92a4f47 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -69,6 +69,7 @@ struct serial8250_config {
 	unsigned int	flags;
 };
 
+#define UART_CAP_HW485	(1 << 7)	/* UART has hardware direction control for RS485 */
 #define UART_CAP_FIFO	(1 << 8)	/* UART has FIFO */
 #define UART_CAP_EFR	(1 << 9)	/* UART has EFR */
 #define UART_CAP_SLEEP	(1 << 10)	/* UART has IER sleep */
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index 8947439..f2831a8 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -208,6 +208,7 @@ fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 	uart.port.iobase = pnp_port_start(dev, 0);
 	uart.port.iotype = UPIO_PORT;
 	uart.port.rs485_config = fintek_8250_rs485_config;
+	uart.capabilities = UART_CAP_HW485;
 
 	uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
 	if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
diff --git a/drivers/tty/serial/8250/8250_lpc18xx.c b/drivers/tty/serial/8250/8250_lpc18xx.c
index 99cd478..9d30276 100644
--- a/drivers/tty/serial/8250/8250_lpc18xx.c
+++ b/drivers/tty/serial/8250/8250_lpc18xx.c
@@ -175,6 +175,7 @@ static int lpc18xx_serial_probe(struct platform_device *pdev)
 	uart.port.private_data = data;
 	uart.port.rs485_config = lpc18xx_rs485_config;
 	uart.port.serial_out = lpc18xx_uart_serial_out;
+	uart.capabilities = UART_CAP_HW485;
 
 	uart.dma = &data->dma;
 	uart.dma->rxconf.src_maxburst = 1;
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 4097f3f..c7c0ae9 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1599,6 +1599,7 @@ static int pci_fintek_setup(struct serial_private *priv,
 	port->port.iotype = UPIO_PORT;
 	port->port.iobase = iobase;
 	port->port.rs485_config = pci_fintek_rs485_config;
+	port->capabilities = UART_CAP_HW485;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(u8), GFP_KERNEL);
 	if (!data)
-- 
2.6.2

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