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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>
This commit is contained in:
Lee Jones 2017-02-03 10:23:12 +00:00 committed by Greg Kroah-Hartman
parent a4f6072fe4
commit 6929cb00a5
1 changed files with 29 additions and 0 deletions
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29
drivers/tty/serial/st-asc.c
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@ -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;
}