On Tue, Aug 05, 2014 at 07:37:21PM +0100, Alexander Shiyan wrote:
> This patch permits to use GPIOs to control the CTS/RTS/DTR/DSR/DCD/RI
> signals.
>
> Signed-off-by: Alexander Shiyan <shc_work@xxxxxxx>
> ---
> .../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 12f3cf8..caaeb25 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.
The commit message states you are adding a capability to the driver, but
you are removing portions of the driver and binding. Please come up with
a better commit message explaining why this is necessary.
Mark.
>
> 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 26cec64..75cc59f 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 f5b4c3d..acfe317 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;
> --
> 1.8.5.5
>
> --
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