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
>
next prev parent reply other threads:[~2021-03-02 11:01 UTC|newest]
Thread overview: 35+ 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 ` [PATCH 2/2] dt-bindings: serial: Add st,swap " Martin Devera
2020-03-10 19:00 ` Rob Herring
2020-03-10 19:00 ` 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 ` [PATCH v2 2/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera
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 22:40 ` Martin DEVERA
2021-03-02 10:20 ` Fabrice Gasnier [this message]
2021-03-02 13:15 ` [PATCH v3 1/2] dt-bindings: serial: Add rx-tx-swap " Martin Devera
2021-03-02 13:15 ` [PATCH v3 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
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 ` [PATCH v4 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
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
2021-03-08 19:20 ` Rob Herring
2021-03-11 21:51 ` [PATCH v5 " Martin Devera
2021-03-11 21:51 ` [PATCH v5 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
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 ` [PATCH v6 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
2021-03-12 14:23 ` [PATCH v6 1/2] dt-bindings: serial: Add rx-tx-swap " Rob Herring
2021-03-12 14:56 ` Martin DEVERA
2021-03-12 15:03 ` Martin DEVERA
2021-03-12 15:37 ` [PATCH v7 " Martin Devera
2021-03-12 15:37 ` [PATCH v7 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
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 ` [PATCH v8 2/2] tty/serial: Add rx-tx-swap OF option " Martin Devera
2021-03-23 22:30 ` [PATCH v7 1/2] dt-bindings: serial: Add rx-tx-swap " Rob Herring
2021-03-02 19:06 ` [PATCH v3 2/2] tty/serial: Add rx-tx-swap OF option " Martin DEVERA
2020-03-12 9:02 ` [PATCH 1/2] tty/serial: Add st,swap " Greg Kroah-Hartman
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