Commit 62b0a1b3 authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Greg Kroah-Hartman
Browse files

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: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2f2dafe7

Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt

+5 −2
Original line number Diff line number Diff line
@@ -8,7 +8,8 @@ Required properties: 
- syscon: Phandle to SYSCON node, which contain UART control bits.



Optional properties:

- uart-use-ms: Indicate the UART has modem signal (DCD, DSR, CTS).

- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD

  line respectively.



Note: Each UART port should have an alias correctly numbered

in "aliases" node.
@@ -24,5 +25,7 @@ Example: 
		interrupts = <12 13>;

		clocks = <&clks 11>;

		syscon = <&syscon1>;

		uart-use-ms;

		cts-gpios = <&sysgpio 0 GPIO_ACTIVE_LOW>;

		dsr-gpios = <&sysgpio 1 GPIO_ACTIVE_LOW>;

		dcd-gpios = <&sysgpio 2 GPIO_ACTIVE_LOW>;

	};

drivers/tty/serial/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -204,6 +204,7 @@ config SERIAL_CLPS711X 
	tristate "CLPS711X serial port support"

	depends on ARCH_CLPS711X || COMPILE_TEST

	select SERIAL_CORE

	select SERIAL_MCTRL_GPIO

	help

	  This enables the driver for the on-chip UARTs of the Cirrus

	  Logic EP711x/EP721x/EP731x processors.

drivers/tty/serial/clps711x.c

+10 −22
Original line number Diff line number Diff line
@@ -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;

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