From mboxrd@z Thu Jan 1 00:00:00 1970 From: robh@kernel.org (Rob Herring) Date: Tue, 3 Jul 2018 17:10:40 -0600 Subject: [PATCH v2] dt-bindings: serial: imx: clarify rs485 support usage In-Reply-To: References: Message-ID: <20180703231040.GA5749@rob-hp-laptop> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > --- > 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