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Subject[PATCH v2 1/2] tty/serial: Add rx-tx-swap OF option to stm32-usart
Date
STM32 F7/H7 usarts supports RX & TX pin swapping.
Add option to turn it on.
Tested on STM32MP157.

Signed-off-by: Martin Devera <devik@eaxlabs.cz>
---
drivers/tty/serial/stm32-usart.c | 3 ++-
drivers/tty/serial/stm32-usart.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index b3675cf25a69..3650c8798061 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -758,7 +758,7 @@ static void stm32_usart_set_termios(struct uart_port *port,
cr1 = USART_CR1_TE | USART_CR1_RE;
if (stm32_port->fifoen)
cr1 |= USART_CR1_FIFOEN;
- cr2 = 0;
+ cr2 = stm32_port->swap ? USART_CR2_SWAP : 0;
cr3 = readl_relaxed(port->membase + ofs->cr3);
cr3 &= USART_CR3_TXFTIE | USART_CR3_RXFTCFG_MASK | USART_CR3_RXFTIE
| USART_CR3_TXFTCFG_MASK;
@@ -1078,6 +1078,7 @@ static struct stm32_port *stm32_usart_of_get_port(struct platform_device *pdev)
stm32_ports[id].hw_flow_control =
of_property_read_bool (np, "st,hw-flow-ctrl") /*deprecated*/ ||
of_property_read_bool (np, "uart-has-rtscts");
+ stm32_ports[id].swap = of_property_read_bool(np, "rx-tx-swap");
stm32_ports[id].port.line = id;
stm32_ports[id].cr1_irq = USART_CR1_RXNEIE;
stm32_ports[id].cr3_irq = 0;
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index cb4f327c46db..2f054e2dc0ab 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -271,6 +271,7 @@ struct stm32_port {
int last_res;
bool tx_dma_busy; /* dma tx busy */
bool hw_flow_control;
+ bool swap; /* swap RX & TX pins */
bool fifoen;
int wakeirq;
int rdr_mask; /* receive data register mask */
--
2.11.0
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