Messages in this thread | | | Subject | Re: [PATCH v3 2/2] tty/serial: Add rx-tx-swap OF option to stm32-usart | From | Martin DEVERA <> | Date | Tue, 2 Mar 2021 20:06:58 +0100 |
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On 3/2/21 6:44 PM, Fabrice Gasnier wrote: > On 3/2/21 2:15 PM, Martin Devera wrote: >> 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 | 11 ++++++++++- >> drivers/tty/serial/stm32-usart.h | 5 +++++ >> 2 files changed, 15 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c >> index b3675cf25a69..d390f7da1441 100644 >> --- a/drivers/tty/serial/stm32-usart.c >> +++ b/drivers/tty/serial/stm32-usart.c >> @@ -644,6 +644,12 @@ static int stm32_usart_startup(struct uart_port *port) >> if (ret) >> return ret; >> >> + if (stm32_port->swap) { >> + val = readl_relaxed(port->membase + ofs->cr2); >> + val |= USART_CR2_SWAP; >> + writel_relaxed(val, port->membase + ofs->cr2); >> + } >> + >> /* RX FIFO Flush */ >> if (ofs->rqr != UNDEF_REG) >> stm32_usart_set_bits(port, ofs->rqr, USART_RQR_RXFRQ); >> @@ -758,7 +764,7 @@ 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; >> @@ -1006,6 +1012,9 @@ static int stm32_usart_init_port(struct stm32_port *stm32port, >> return stm32port->wakeirq ? : -ENODEV; >> } >> >> + stm32port->swap = stm32port->info->cfg.has_swap && >> + of_property_read_bool(pdev->dev.of_node, "rx-tx-swap"); >> + >> stm32port->fifoen = stm32port->info->cfg.has_fifo; >> >> res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h >> index cb4f327c46db..bd18dd1c1bcd 100644 >> --- a/drivers/tty/serial/stm32-usart.h >> +++ b/drivers/tty/serial/stm32-usart.h >> @@ -25,6 +25,7 @@ struct stm32_usart_offsets { >> struct stm32_usart_config { >> u8 uart_enable_bit; /* USART_CR1_UE */ >> bool has_7bits_data; >> + bool has_swap; >> bool has_wakeup; >> bool has_fifo; >> int fifosize; >> @@ -55,6 +56,7 @@ struct stm32_usart_info stm32f4_info = { >> .cfg = { >> .uart_enable_bit = 13, >> .has_7bits_data = false, >> + .has_swap = false, > Hi Martin, > > Only one minor comment from me here. No need to add a false (zero) > initialization in this struct. I'm not sure why this is the case for the > has_7bits_data here... > > With that fixed, you can add my: > Acked-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> > The has_7bits_data was what made me a bit unsure. Ok fixed now. Thank you for your review.
Martin
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