serial: clps711x: Use mctrl_gpio helpers for handling modem signals

CLPS711X serial driver uses the system wide registers to control the
modem signals. Now gpio-syscon driver can be used for this purposes.
mctrl_gpio helpers allow us to create GPIO bindings for any of modem/tty
control signals that extends the functionality of the driver.
This patch makes such change.

This change does not break any current DT bindings, since DT support
for this platform is not introduced yet.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 10 insertions, 22 deletions

diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index f5b4c3d7e38f..acfe31773643 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -33,6 +33,8 @@
 #include <linux/mfd/syscon.h>
 #include <linux/mfd/syscon/clps711x.h>
 
+#include "serial_mctrl_gpio.h"
+
 #define UART_CLPS711X_DEVNAME	"ttyCL"
 #define UART_CLPS711X_NR	2
 #define UART_CLPS711X_MAJOR	204
@@ -62,7 +64,7 @@ struct clps711x_port {
 	unsigned int		tx_enabled;
 	int			rx_irq;
 	struct regmap		*syscon;
-	bool			use_ms;
+	struct mctrl_gpios	*gpios;
 };
 
 static struct uart_driver clps711x_uart = {
@@ -198,28 +200,17 @@ static unsigned int uart_clps711x_tx_empty(struct uart_port *port)
 
 static unsigned int uart_clps711x_get_mctrl(struct uart_port *port)
 {
+	unsigned int result = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
 	struct clps711x_port *s = dev_get_drvdata(port->dev);
-	unsigned int result = 0;
-
-	if (s->use_ms) {
-		u32 sysflg = 0;
-
-		regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
-		if (sysflg & SYSFLG1_DCD)
-			result |= TIOCM_CAR;
-		if (sysflg & SYSFLG1_DSR)
-			result |= TIOCM_DSR;
-		if (sysflg & SYSFLG1_CTS)
-			result |= TIOCM_CTS;
-	} else
-		result = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
 
-	return result;
+	return mctrl_gpio_get(s->gpios, &result);
 }
 
 static void uart_clps711x_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-	/* Do nothing */
+	struct clps711x_port *s = dev_get_drvdata(port->dev);
+
+	mctrl_gpio_set(s->gpios, mctrl);
 }
 
 static void uart_clps711x_break_ctl(struct uart_port *port, int break_state)
@@ -490,15 +481,10 @@ static int uart_clps711x_probe(struct platform_device *pdev)
 		s->syscon = syscon_regmap_lookup_by_pdevname(syscon_name);
 		if (IS_ERR(s->syscon))
 			return PTR_ERR(s->syscon);
-
-		s->use_ms = !index;
 	} else {
 		s->syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 		if (IS_ERR(s->syscon))
 			return PTR_ERR(s->syscon);
-
-		if (!index)
-			s->use_ms = of_property_read_bool(np, "uart-use-ms");
 	}
 
 	s->port.line		= index;
@@ -513,6 +499,8 @@ static int uart_clps711x_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, s);
 
+	s->gpios = mctrl_gpio_init(&pdev->dev, 0);
+
 	ret = uart_add_one_port(&clps711x_uart, &s->port);
 	if (ret)
 		return ret;