From: Christoph Niedermaier <cniedermaier@dh-electronics.com>
To: <linux-serial@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>
Cc: <krzysztof.kozlowski+dt@linaro.org>, <marex@denx.de>,
<jirislaby@kernel.org>,
Christoph Niedermaier <cniedermaier@dh-electronics.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Alexander Dahl <ada@thorsis.com>, <kernel@dh-electronics.com>,
<linux-stm32@st-md-mailman.stormreply.com>
Subject: [PATCH V2 4/4] serial: stm32: Add support for rs485 RX_DURING_TX output GPIO
Date: Wed, 23 Nov 2022 13:30:04 +0100 [thread overview]
Message-ID: <20221123123004.7216-4-cniedermaier@dh-electronics.com> (raw)
In-Reply-To: <20221123123004.7216-1-cniedermaier@dh-electronics.com>
If a RX_DURING_TX GPIO is defined by the DT property "rs485-rx-during-tx-gpios"
this patch switches this GPIO accordingly to the RS485 flag RX_DURING_TX in user
space. Controlled by this GPIO, now the hardware is responsible for connecting
or disconnecting RX during TX.
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
---
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Alexander Dahl <ada@thorsis.com>
Cc: Marek Vasut <marex@denx.de>
Cc: kernel@dh-electronics.com
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-serial@vger.kernel.org
To: linux-arm-kernel@lists.infradead.org
---
V2: - Rework of the commit message
---
drivers/tty/serial/stm32-usart.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 24def72b2565..f1bef784b020 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -226,7 +226,14 @@ static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *ter
stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- rs485conf->flags |= SER_RS485_RX_DURING_TX;
+ if (port->rs485_rx_during_tx_gpio) {
+ if (rs485conf->flags & SER_RS485_RX_DURING_TX)
+ gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, 1);
+ else
+ gpiod_set_value_cansleep(port->rs485_rx_during_tx_gpio, 0);
+ } else {
+ rs485conf->flags |= SER_RS485_RX_DURING_TX;
+ }
if (rs485conf->flags & SER_RS485_ENABLED) {
cr1 = readl_relaxed(port->membase + ofs->cr1);
--
2.11.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-11-23 13:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 12:30 [PATCH V2 1/4] dt_bindings: rs485: Add binding for GPIO that controls Rx enable during Tx Christoph Niedermaier
2022-11-23 12:30 ` [PATCH V2 2/4] serial: core: Add option to output RS485 RX_DURING_TX state via GPIO Christoph Niedermaier
2022-11-23 12:30 ` [PATCH V2 3/4] serial: imx: Add support for RS485 RX_DURING_TX output GPIO Christoph Niedermaier
2022-11-23 12:30 ` Christoph Niedermaier [this message]
2022-11-24 10:03 ` [PATCH V2 1/4] dt_bindings: rs485: Add binding for GPIO that controls Rx enable during Tx Krzysztof Kozlowski
2022-11-30 21:15 ` Rob Herring
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221123123004.7216-4-cniedermaier@dh-electronics.com \
--to=cniedermaier@dh-electronics.com \
--cc=ada@thorsis.com \
--cc=alexandre.torgue@foss.st.com \
--cc=gregkh@linuxfoundation.org \
--cc=jirislaby@kernel.org \
--cc=kernel@dh-electronics.com \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-serial@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=marex@denx.de \
--cc=mcoquelin.stm32@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).