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authorAlexander Shiyan <shc_work@mail.ru>2014-09-06 07:20:15 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-08 15:35:03 -0700
commit62b0a1b3e7593e0647db9ecc5e7809e4410acb81 (patch)
treee1a998c79be08f50ead33795cbd73e936b5256cb
parent2f2dafe77df2c78e189a9fa6b1879dffd06ae5a1 (diff)
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>
-rw-r--r--Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt7
-rw-r--r--drivers/tty/serial/Kconfig1
-rw-r--r--drivers/tty/serial/clps711x.c32
3 files changed, 16 insertions, 24 deletions
diff --git a/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt b/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
index 12f3cf834de..caaeb258357 100644
--- a/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
+++ b/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
@@ -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>;
};
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 26cec64dadd..75cc59f5d25 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -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.
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index f5b4c3d7e38..acfe3177364 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;