From: Fabrice Gasnier <fabrice.gasnier@foss.st.com> To: Martin DEVERA <devik@eaxlabs.cz>, <linux-kernel@vger.kernel.org> Cc: <devicetree@vger.kernel.org>, Alexandre Torgue <alexandre.torgue@st.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, <linux-arm-kernel@lists.infradead.org>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, <linux-serial@vger.kernel.org>, Jiri Slaby <jirislaby@kernel.org>, <linux-stm32@st-md-mailman.stormreply.com>, Le Ray <erwan.leray@st.com> Subject: Re: [PATCH v2 1/2] tty/serial: Add rx-tx-swap OF option to stm32-usart Date: Tue, 2 Mar 2021 11:20:07 +0100 [thread overview] Message-ID: <019b62e9-ec9b-d366-ee77-59c980d66a07@foss.st.com> (raw) In-Reply-To: <fbdce86c-a17f-7626-51e4-9e48ea25001e@eaxlabs.cz> On 3/1/21 11:40 PM, Martin DEVERA wrote: > On 3/1/21 11:28 AM, Fabrice Gasnier wrote: >> On 2/27/21 5:41 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 | 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; >> Hi Martin, >> >> Same could be done in the startup routine, that enables the port for >> reception (as described in Documentation/driver-api/serial/driver.rst) > Hello Fabrice, > > I already incorporated all your comments but I'm struggling with the one > above. > The code must be in stm32_usart_set_termios too, because CR2 is modified. Hi Martin, Yes, sure, > What is the reason to have it in startup() ? RX is enabled at both places. So the swap setting should be there too. > Is it because USART can be started without calling set_termios at all ? Yes, that's what the driver API expects: "startup(port)" ... "Enable the port for reception." Best Regards, Fabrice > Like > to reuse bootloader's last settings ? > > Thanks, Martin >
WARNING: multiple messages have this Message-ID (diff)
From: Fabrice Gasnier <fabrice.gasnier@foss.st.com> To: Martin DEVERA <devik@eaxlabs.cz>, <linux-kernel@vger.kernel.org> Cc: devicetree@vger.kernel.org, Alexandre Torgue <alexandre.torgue@st.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, Le Ray <erwan.leray@st.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, linux-serial@vger.kernel.org, Jiri Slaby <jirislaby@kernel.org>, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 1/2] tty/serial: Add rx-tx-swap OF option to stm32-usart Date: Tue, 2 Mar 2021 11:20:07 +0100 [thread overview] Message-ID: <019b62e9-ec9b-d366-ee77-59c980d66a07@foss.st.com> (raw) In-Reply-To: <fbdce86c-a17f-7626-51e4-9e48ea25001e@eaxlabs.cz> On 3/1/21 11:40 PM, Martin DEVERA wrote: > On 3/1/21 11:28 AM, Fabrice Gasnier wrote: >> On 2/27/21 5:41 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 | 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; >> Hi Martin, >> >> Same could be done in the startup routine, that enables the port for >> reception (as described in Documentation/driver-api/serial/driver.rst) > Hello Fabrice, > > I already incorporated all your comments but I'm struggling with the one > above. > The code must be in stm32_usart_set_termios too, because CR2 is modified. Hi Martin, Yes, sure, > What is the reason to have it in startup() ? RX is enabled at both places. So the swap setting should be there too. > Is it because USART can be started without calling set_termios at all ? Yes, that's what the driver API expects: "startup(port)" ... "Enable the port for reception." Best Regards, Fabrice > Like > to reuse bootloader's last settings ? > > Thanks, Martin > _______________________________________________ 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:[~2021-03-02 11:01 UTC|newest] Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-29 16:05 [PATCH 1/2] tty/serial: Add st,swap OF option to stm32-usart Martin Devera 2020-02-29 16:05 ` Martin Devera 2020-02-29 16:05 ` [PATCH 2/2] dt-bindings: serial: Add st,swap " Martin Devera 2020-02-29 16:05 ` Martin Devera 2020-03-10 19:00 ` Rob Herring 2020-03-10 19:00 ` Rob Herring 2020-03-10 19:00 ` Rob Herring 2020-03-20 18:05 ` Rob Herring 2020-03-20 18:05 ` Rob Herring 2021-02-27 16:41 ` [PATCH v2 1/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-02-27 16:41 ` Martin Devera 2021-02-27 16:41 ` [PATCH v2 2/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera 2021-02-27 16:41 ` Martin Devera 2021-03-01 10:36 ` Fabrice Gasnier 2021-03-01 10:36 ` Fabrice Gasnier 2021-03-01 10:28 ` [PATCH v2 1/2] tty/serial: Add rx-tx-swap OF option " Fabrice Gasnier 2021-03-01 10:28 ` Fabrice Gasnier 2021-03-01 22:40 ` Martin DEVERA 2021-03-01 22:40 ` Martin DEVERA 2021-03-02 10:20 ` Fabrice Gasnier [this message] 2021-03-02 10:20 ` Fabrice Gasnier 2021-03-02 13:15 ` [PATCH v3 1/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera 2021-03-02 13:15 ` Martin Devera 2021-03-02 13:15 ` [PATCH v3 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-02 13:15 ` Martin Devera 2021-03-02 17:44 ` Fabrice Gasnier 2021-03-02 17:44 ` Fabrice Gasnier 2021-03-02 19:03 ` [PATCH v4 1/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera 2021-03-02 19:03 ` Martin Devera 2021-03-02 19:03 ` [PATCH v4 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-02 19:03 ` Martin Devera 2021-03-03 16:06 ` Fabrice Gasnier 2021-03-03 16:06 ` Fabrice Gasnier 2021-03-03 17:23 ` [PATCH v4 1/2] dt-bindings: serial: Add rx-tx-swap " Fabrice Gasnier 2021-03-03 17:23 ` Fabrice Gasnier 2021-03-08 19:20 ` Rob Herring 2021-03-08 19:20 ` Rob Herring 2021-03-11 21:51 ` [PATCH v5 " Martin Devera 2021-03-11 21:51 ` Martin Devera 2021-03-11 21:51 ` [PATCH v5 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-11 21:51 ` Martin Devera 2021-03-12 8:15 ` Greg Kroah-Hartman 2021-03-12 8:15 ` Greg Kroah-Hartman 2021-03-12 10:27 ` [PATCH v6 1/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera 2021-03-12 10:27 ` Martin Devera 2021-03-12 10:27 ` [PATCH v6 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-12 10:27 ` Martin Devera 2021-03-12 14:23 ` [PATCH v6 1/2] dt-bindings: serial: Add rx-tx-swap " Rob Herring 2021-03-12 14:23 ` Rob Herring 2021-03-12 14:56 ` Martin DEVERA 2021-03-12 14:56 ` Martin DEVERA 2021-03-12 15:03 ` Martin DEVERA 2021-03-12 15:03 ` Martin DEVERA 2021-03-12 15:37 ` [PATCH v7 " Martin Devera 2021-03-12 15:37 ` Martin Devera 2021-03-12 15:37 ` [PATCH v7 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-12 15:37 ` Martin Devera 2021-03-26 14:18 ` Greg Kroah-Hartman 2021-03-26 14:18 ` Greg Kroah-Hartman 2021-03-28 15:43 ` [PATCH v8 1/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera 2021-03-28 15:43 ` Martin Devera 2021-03-28 15:43 ` [PATCH v8 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera 2021-03-28 15:43 ` Martin Devera 2021-03-23 22:30 ` [PATCH v7 1/2] dt-bindings: serial: Add rx-tx-swap " Rob Herring 2021-03-23 22:30 ` Rob Herring 2021-03-02 19:06 ` [PATCH v3 2/2] tty/serial: Add rx-tx-swap OF option " Martin DEVERA 2021-03-02 19:06 ` Martin DEVERA 2020-03-12 9:02 ` [PATCH 1/2] tty/serial: Add st,swap " Greg Kroah-Hartman 2020-03-12 9:02 ` Greg Kroah-Hartman
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