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Subject[PATCH 3/8] serial: st-asc: Read in all Pinctrl states
Date
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`).

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/tty/serial/st-asc.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index 397df50..03801ed 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -37,10 +37,16 @@
#define ASC_FIFO_SIZE 16
#define ASC_MAX_PORTS 8

+/* Pinctrl states */
+#define DEFAULT 0
+#define MANUAL_RTS 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 +700,7 @@ 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 +727,27 @@ 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;
+ }
+
+ /* "manual-rts" state is optional */
+ ascport->states[MANUAL_RTS] =
+ pinctrl_lookup_state(ascport->pinctrl, "manual-rts");
+ if (IS_ERR(ascport->states[MANUAL_RTS]))
+ ascport->states[MANUAL_RTS] = NULL;
+
return 0;
}

--
2.10.2
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