linux-kernel - Re: [PATCH v2] tty: serial: atmel: add earlycon support

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Date:   Thu, 17 Feb 2022 11:03:58 +0100
From:   Richard Genoud <richard.genoud@...il.com>
To:     Michael Walle <michael@...le.cc>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tty: serial: atmel: add earlycon support



Le 17/02/2022 à 10:46, Michael Walle a écrit :
> Add early console support which relies on the bootloader for the
> initialization of the UART.
> Please note, that the compatibles are taken from at91-usart MFD
> driver.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
Acked-by: Richard Genoud <richard.genoud@...il.com>

> ---
>   drivers/tty/serial/Kconfig        |  1 +
>   drivers/tty/serial/atmel_serial.c | 24 ++++++++++++++++++++++++
>   2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 0e5ccb25bdb1..407a98ec0791 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -139,6 +139,7 @@ config SERIAL_ATMEL_CONSOLE
>   	bool "Support for console on AT91 serial port"
>   	depends on SERIAL_ATMEL=y
>   	select SERIAL_CORE_CONSOLE
> +	select SERIAL_EARLYCON
>   	help
>   	  Say Y here if you wish to use an on-chip UART on a Atmel
>   	  AT91 processor as the system console (the system
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 2d09a89974a2..73d43919898d 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -2673,6 +2673,30 @@ static struct console atmel_console = {
>   	.data		= &atmel_uart,
>   };
>   
> +static void atmel_serial_early_write(struct console *con, const char *s,
> +				     unsigned int n)
> +{
> +	struct earlycon_device *dev = con->data;
> +
> +	uart_console_write(&dev->port, s, n, atmel_console_putchar);
> +}
> +
> +static int __init atmel_early_console_setup(struct earlycon_device *device,
> +					    const char *options)
> +{
> +	if (!device->port.membase)
> +		return -ENODEV;
> +
> +	device->con->write = atmel_serial_early_write;
> +
> +	return 0;
> +}
> +
> +OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91rm9200-usart",
> +		    atmel_early_console_setup);
> +OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91sam9260-usart",
> +		    atmel_early_console_setup);
> +
>   #define ATMEL_CONSOLE_DEVICE	(&atmel_console)
>   
>   #else
Thanks !