On Thu, Jun 28, 2018 at 10:25:32AM +0300, Baruch Siach wrote:

The i.MX UART peripheral uses the RST_B signal as input, and CTS_B as

s/RST_B/RTS_B/

output. This is just like the DCE role in RS-232. This is true
regardless of the "DTE mode" setting of this peripheral.

As a result, rs485 support hardware must use the CTS_B signal to control
the RS-485 transceiver. This is in contrast to generic rs485 kernel
code, documentation, and DT property names that consistently refer to
the RTS as transceiver control signal.

Add a note in the DT binding document about that, to reduce the
confusion somewhat.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
v2: Fix commit log typos (Lothar Wa?mann)
---
 Documentation/devicetree/bindings/serial/fsl-imx-uart.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

With that,

Reviewed-by: Rob Herring <robh@kernel.org>