linux-kernel - Re: [PATCH v9 2/2] tty: serial: meson: Add a earlycon for the T7 SoC

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Date:   Sat, 26 Aug 2023 19:07:18 +0100
From:   Lucas Tanure <tanure@...ux.com>
To:     Dmitry Rokosov <ddrokosov@...rdevices.ru>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Xianwei Zhao <xianwei.zhao@...ogic.com>,
        Nick <nick@...das.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v9 2/2] tty: serial: meson: Add a earlycon for the T7 SoC

On 23-08-2023 09:29, Dmitry Rokosov wrote:
> Hello Lucas,
> 
> Thank you for the patch! Please find my small comment below.
> 
> On Mon, Aug 14, 2023 at 09:01:28AM +0100, Lucas Tanure wrote:
>> The new Amlogic T7 SoC does not have a always-on uart,
>> so add OF_EARLYCON_DECLARE for it.
>>
>> Signed-off-by: Lucas Tanure <tanure@...ux.com>
>> Acked-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>> Since v8:
>>   - Fix issues with git send-mail command line
>> Since v7:
>>   - Send to the correct maintainers
>>
>>   drivers/tty/serial/meson_uart.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
>> index 790d910dafa5..c4f61d82fb72 100644
>> --- a/drivers/tty/serial/meson_uart.c
>> +++ b/drivers/tty/serial/meson_uart.c
>> @@ -648,6 +648,8 @@ meson_serial_early_console_setup(struct earlycon_device *device, const char *opt
>>   
>>   OF_EARLYCON_DECLARE(meson, "amlogic,meson-ao-uart",
>>   		    meson_serial_early_console_setup);
>> +OF_EARLYCON_DECLARE(meson, "amlogic,t7-uart",
>> +		    meson_serial_early_console_setup);
>>   
>>   #define MESON_SERIAL_CONSOLE_PTR(_devname) (&meson_serial_console_##_devname)
>>   #else
> 
> I suppose you need to add a separate meson_t7_uart_data to switch the T7
> UART to a regular TTY devname 'ttyS'. For the new Amlogic SoCs, we have
> agreed to use 'ttyS' instead of 'ttyAML'. Please refer to the already
> applied patch series at [1] and the IRC discussion at [2].
> 
> Links:
>      [1] https://lore.kernel.org/all/20230705181833.16137-1-ddrokosov@sberdevices.ru/
>      [2] https://libera.irclog.whitequark.org/linux-amlogic/2023-07-03
> 
I asked Greg to drop this patch as is not need anymore.
T7 will use S4 TTY/UART code.