diff options
| author | Lee Jones <lee.jones@linaro.org> | 2017-02-03 11:23:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-06 09:47:52 +0100 |
| commit | 6929cb00a5017633aa54c6a9071cc0abfd573b47 (patch) | |
| tree | 35d5b50f3ed8363fb4b316ad2946eb2197370d43 /drivers/tty | |
| parent | serial: st-asc: Provide RTS functionality (diff) | |
| download | linux-6929cb00a5017633aa54c6a9071cc0abfd573b47.tar.xz linux-6929cb00a5017633aa54c6a9071cc0abfd573b47.zip | |
serial: st-asc: Read in all Pinctrl states
There are now 2 possible separate/different Pinctrl states which can
be provided from platform data. One which encompasses the lines
required for HW flow-control (CTS/RTS) and another which does not
specify these lines, such that they can be used via GPIO mechanisms
for manually toggling (i.e. from a request by `stty`).
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/st-asc.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index 397df507579e..105802099e47 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -18,6 +18,7 @@ #include <linux/serial.h> #include <linux/console.h> #include <linux/sysrq.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/irq.h> @@ -37,10 +38,16 @@ #define ASC_FIFO_SIZE 16 #define ASC_MAX_PORTS 8 +/* Pinctrl states */ +#define DEFAULT 0 +#define NO_HW_FLOWCTRL 1 + struct asc_port { struct uart_port port; struct gpio_desc *rts; struct clk *clk; + struct pinctrl *pinctrl; + struct pinctrl_state *states[2]; unsigned int hw_flow_control:1; unsigned int force_m1:1; }; @@ -694,6 +701,7 @@ static int asc_init_port(struct asc_port *ascport, { struct uart_port *port = &ascport->port; struct resource *res; + int ret; port->iotype = UPIO_MEM; port->flags = UPF_BOOT_AUTOCONF; @@ -720,6 +728,27 @@ static int asc_init_port(struct asc_port *ascport, WARN_ON(ascport->port.uartclk == 0); clk_disable_unprepare(ascport->clk); + ascport->pinctrl = devm_pinctrl_get(&pdev->dev); + if (IS_ERR(ascport->pinctrl)) { + ret = PTR_ERR(ascport->pinctrl); + dev_err(&pdev->dev, "Failed to get Pinctrl: %d\n", ret); + } + + ascport->states[DEFAULT] = + pinctrl_lookup_state(ascport->pinctrl, "default"); + if (IS_ERR(ascport->states[DEFAULT])) { + ret = PTR_ERR(ascport->states[DEFAULT]); + dev_err(&pdev->dev, + "Failed to look up Pinctrl state 'default': %d\n", ret); + return ret; + } + + /* "no-hw-flowctrl" state is optional */ + ascport->states[NO_HW_FLOWCTRL] = + pinctrl_lookup_state(ascport->pinctrl, "no-hw-flowctrl"); + if (IS_ERR(ascport->states[NO_HW_FLOWCTRL])) + ascport->states[NO_HW_FLOWCTRL] = NULL; + return 0; } |