[PATCH v2 03/10] serial: st-asc: Read in all Pinctrl states
From: Lee Jones <hidden>
Date: 2017-01-27 17:28:52
Also in:
linux-arm-kernel, linux-serial, lkml
Subsystem:
arm/sti architecture, the rest, tty layer and serial drivers · Maintainers:
Patrice Chotard, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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 <redacted> --- drivers/tty/serial/st-asc.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index 397df50..82f5714 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 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 +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; + } + + /* "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; }
--
2.9.3
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