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| author |   Lukas Wunner <lukas@wunner.de> | 2020-05-12 14:40:02 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-15 14:47:05 +0200 |
| commit | c150c0f362c1e51c0e3216c9912b85b71d00e70d (patch) | |
| tree | c0cefb23cc8355ab56cf9c988d9d475d739e7247 /include/linux/serial_core.h | |
| parent | serial: 8250: Avoid error message on reprobe (diff) | |
| download | wireguard-linux-c150c0f362c1e51c0e3216c9912b85b71d00e70d.tar.xz wireguard-linux-c150c0f362c1e51c0e3216c9912b85b71d00e70d.zip | |
serial: Allow uart_get_rs485_mode() to return errno
We're about to amend uart_get_rs485_mode() to support a GPIO pin for
rs485 bus termination. Retrieving the GPIO descriptor may fail, so
allow uart_get_rs485_mode() to return an errno and change all callers
to check for failure.
The GPIO descriptor is going to be stored in struct uart_port. Pass
that struct to uart_get_rs485_mode() in lieu of a struct device and
struct serial_rs485, both of which are directly accessible from struct
uart_port.
A few drivers call uart_get_rs485_mode() before setting the struct
device pointer in struct uart_port. Shuffle those calls around where
necessary.
[Heiko Stuebner did the ar933x_uart.c portion, hence his Signed-off-by.]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/271e814af4b0db3bffbbb74abf2b46b75add4516.1589285873.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/serial_core.h')
| -rw-r--r-- | include/linux/serial_core.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 92f5eba86052..b649a2b894e7 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -472,5 +472,5 @@ extern int uart_handle_break(struct uart_port *port); (cflag) & CRTSCTS || \ !((cflag) & CLOCAL)) -void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf); +int uart_get_rs485_mode(struct uart_port *port); #endif /* LINUX_SERIAL_CORE_H */ |