Hi everybody,
Il 04/06/2018 12:34, Matwey V. Kornilov ha scritto:
2018-06-04 13:12 GMT+03:00 Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>:
On Fri, 2018-06-01 at 14:40 +0200, Giulio Benetti wrote:
Need to handle rs485 with 8250_dw port.
Use existing em485 emulation layer for 8250 taking care to fix some
bug
and taking care especially of RTS_AFTER_SEND case.
I don't see in Cc list author of rs485 code, who might be interested in
this.
So, added him here.
Thanks Andy for adding in Cc an reviewing.
Dumb question: how did you find him?
I thought he was between people on get_maintainer.pl output.
Hi, Andy
Nice to see you there. I will look through the code later.
I always thought that DW has its own hardware rs485 support.
Hi Matwey,
I've checked on Synopsis Designware 8250 datasheet and it's not supported.
Here is datasheet I went through:
https://linux-sunxi.org/images/d/d2/Dw_apb_uart_db.pdf
On IER register there is not TEMT bit or something like that used in
8250_omap.
Am I right?
Thanks everybody and
best regards
--
Giulio Benetti
CTO
MICRONOVA SRL
Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
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Giulio Benetti (8):
serial: 8250_dw: add em485 support
serial: 8250_dw: allow enable rs485 at boot time
serial: 8250: Copy em485 from port to real port.
serial: 8250: Handle case port doesn't have TEMT interrupt using
em485.
serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and
RTS_AFTER_SEND
serial: 8250: Copy mctrl when register port.
serial: 8250: Make em485_rts_after_send() set mctrl according to rts
state.
serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and
RTS_AFTER_SEND set.
drivers/tty/serial/8250/8250.h | 2 +-
drivers/tty/serial/8250/8250_core.c | 2 ++
drivers/tty/serial/8250/8250_dw.c | 41
++++++++++++++++++++++++++++-
drivers/tty/serial/8250/8250_omap.c | 2 +-
drivers/tty/serial/8250/8250_port.c | 33 ++++++++++++++++-------
drivers/tty/serial/serial_core.c | 12 ++++++++-
include/linux/serial_8250.h | 1 +
7 files changed, 79 insertions(+), 14 deletions(-)
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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