diff options
| author | Yegor Yefremov <yegorslists@googlemail.com> | 2019-06-20 08:24:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-21 10:18:43 +0200 |
| commit | 4a96895f74c9633b51427fd080ab70fa62b65bc4 (patch) | |
| tree | facc2d543408ca27666b401ec6ba80b5c14f8283 /drivers/tty/serial/8250/8250_core.c | |
| parent | d99482673f950817b30caf3fcdfb31179b050ce1 (diff) | |
tty/serial/8250: use mctrl_gpio helpers
This patch permits the usage for GPIOs to control
the CTS/RTS/DTR/DSR/DCD/RI signals.
Changed by Stefan:
Only call mctrl_gpio_init(), if the device has no ACPI companion device
to not break existing ACPI based systems. Also only use the mctrl_gpio_
functions when "gpios" is available.
Use MSR / MCR <-> TIOCM wrapper functions.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Giulio Benetti <giulio.benetti@micronovasrl.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250_core.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e441221e04b9..a4470771005f 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -14,6 +14,7 @@ * serial8250_register_8250_port() ports */ +#include <linux/acpi.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/ioport.h> @@ -982,6 +983,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart = serial8250_find_match_or_unused(&up->port); if (uart && uart->port.type != PORT_8250_CIR) { + struct mctrl_gpios *gpios; + if (uart->port.dev) uart_remove_one_port(&serial8250_reg, &uart->port); @@ -1016,6 +1019,20 @@ int serial8250_register_8250_port(struct uart_8250_port *up) if (up->port.flags & UPF_FIXED_TYPE) uart->port.type = up->port.type; + /* + * Only call mctrl_gpio_init(), if the device has no ACPI + * companion device + */ + if (!has_acpi_companion(uart->port.dev)) { + gpios = mctrl_gpio_init(&uart->port, 0); + if (IS_ERR(gpios)) { + if (PTR_ERR(gpios) != -ENOSYS) + return PTR_ERR(gpios); + } else { + uart->gpios = gpios; + } + } + serial8250_set_defaults(uart); /* Possibly override default I/O functions. */ |