| Message ID | 20220216161822.1071245-1-michael@walle.cc |
|---|---|
| State | New |
| Headers | show |
| Series | tty: serial: atmel: add earlycon support | expand |
Hi Micheal, On 16.02.2022 18:18, Michael Walle wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > 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@walle.cc> > --- > drivers/tty/serial/atmel_serial.c | 24 ++++++++++++++++++++++++ > 1 file changed, 24 insertions(+) > > diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c > index 2d09a89974a2..50fc6d51ff0d 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(atmelserial, "atmel,at91rm9200-usart", > + atmel_early_console_setup); > +OF_EARLYCON_DECLARE(atmelserial, "atmel,at91sam9260-usart", For consistency with the rest of the naming in this file could you name it atmel_serial? Also, it would be good to select SERIAL_EARLYCON in Kconfig to have it available also for production w/o changing defconfigs. Thank you, Claudiu Beznea > + atmel_early_console_setup); > + > #define ATMEL_CONSOLE_DEVICE (&atmel_console) > > #else > -- > 2.30.2 >
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 2d09a89974a2..50fc6d51ff0d 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(atmelserial, "atmel,at91rm9200-usart", + atmel_early_console_setup); +OF_EARLYCON_DECLARE(atmelserial, "atmel,at91sam9260-usart", + atmel_early_console_setup); + #define ATMEL_CONSOLE_DEVICE (&atmel_console) #else
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@walle.cc> --- drivers/tty/serial/atmel_serial.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)