diff options
| author |   Fabio Estevam <fabio.estevam@nxp.com> | 2017-01-30 09:12:12 -0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-31 10:54:58 +0100 |
| commit | bc2be239feef9ac9fc8ad17adf7c03b353f6546f (patch) | |
| tree | 1c4e2caac30b566fa6498500909cb2ea148717ba /drivers/tty/serial/8250/Kconfig | |
| parent | serial: imx: Fix the RTS GPIO polarity in RS485 mode (diff) | |
| download | linux-dev-bc2be239feef9ac9fc8ad17adf7c03b353f6546f.tar.xz linux-dev-bc2be239feef9ac9fc8ad17adf7c03b353f6546f.zip | |
serial: imx: Fix the CTS_B polarity in RS485 mode
When userspace passes the SER_RS485_RTS_ON_SEND flag it means that the
CTS_B pin should go to logic level high before the transmission begins.
CTS_B goes to logic level high when both CTSC and CTS bits are cleared.
When userspace passes the SER_RS485_RTS_AFTER_SEND flag it means that the
CTS_B pin should go to logic level low after the transmission finishes.
CTS_B goes to logic level low when CTSC bit is cleared and CTS bit is set.
So fix the CTS_B polarity logic.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/Kconfig')
0 files changed, 0 insertions, 0 deletions