From 62b0a1b3e7593e0647db9ecc5e7809e4410acb81 Mon Sep 17 00:00:00 2001 From: Alexander Shiyan Date: Sat, 6 Sep 2014 07:20:15 +0400 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- .../bindings/serial/cirrus,clps711x-uart.txt | 7 ++-- drivers/tty/serial/Kconfig | 1 + drivers/tty/serial/clps711x.c | 32 ++++++------------- 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 12f3cf834deb..caaeb2583579 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 26cec64dadd7..75cc59f5d253 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 f5b4c3d7e38f..acfe31773643 100644 --- a/drivers/tty/serial/clps711x.c +++ b/drivers/tty/serial/clps711x.c @@ -33,6 +33,8 @@ #include #include +#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; -- GitLab