diff options
| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2022-06-06 13:04:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-10 14:49:25 +0300 |
| commit | 00d7a00e2a6ff60140068cadb6739ee0a13f5297 (patch) | |
| tree | d8100feda01e6c71262403dcdbe79a0783bacff5 /drivers/tty | |
| parent | 07481f448b635d7cebb92d5940f5bea5c4395a26 (diff) | |
| download | linux-00d7a00e2a6ff60140068cadb6739ee0a13f5297.tar.xz | |
serial: imx: Fill in rs485_supported
Add information on supported serial_rs485 features.
In the case where RTS is lacking, RS485 cannot be enabled so provide
zero rs485_supported for that case. Perhaps it would make sense to not
provide rs485_config() at all in that case but such a change would have
userspace visible impact/change in behavior so this patch does not
attempt it.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-17-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 17fb9a57078b..9d5f505008f7 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -2200,6 +2200,14 @@ static enum hrtimer_restart imx_trigger_stop_tx(struct hrtimer *t) return HRTIMER_NORESTART; } +static const struct serial_rs485 imx_no_rs485 = {}; /* No RS485 if no RTS */ +static const struct serial_rs485 imx_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND | + SER_RS485_RX_DURING_TX, + .delay_rts_before_send = 1, + .delay_rts_after_send = 1, +}; + /* Default RX DMA buffer configuration */ #define RX_DMA_PERIODS 16 #define RX_DMA_PERIOD_LEN (PAGE_SIZE / 4) @@ -2279,6 +2287,11 @@ static int imx_uart_probe(struct platform_device *pdev) sport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE); sport->port.ops = &imx_uart_pops; sport->port.rs485_config = imx_uart_rs485_config; + /* RTS is required to control the RS485 transmitter */ + if (sport->have_rtscts || sport->have_rtsgpio) + sport->port.rs485_supported = &imx_rs485_supported; + else + sport->port.rs485_supported = &imx_no_rs485; sport->port.flags = UPF_BOOT_AUTOCONF; timer_setup(&sport->timer, imx_uart_timeout, 0); |