Re: [PATCH 1/2] drivers: serial: earlycon: Pass device-tree node

Greg Kroah-Hartman
2022-07-28T14:41:04Z

On Thu, Jul 28, 2022 at 05:28:18PM +0300, Markuss Broks wrote:
> Pass a pointer to device-tree node in case the driver probed from
> OF. This makes early console drivers able to fetch options from
> device-tree node properties.
>
> Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
> ---
> drivers/tty/serial/earlycon.c | 3 +++
> include/linux/serial_core.h | 1 +
> 2 files changed, 4 insertions(+)
>
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 57c70851f22a0e78805f34d1a7700708104b6f6a..14e8a7fe54486a1c377a6659c37a73858de5bf0b 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -304,6 +304,9 @@ int __init of_setup_earlycon(const struct earlycon_id *match,
> strlcpy(early_console_dev.options, options,
> sizeof(early_console_dev.options));
> }
> +
> + early_console_dev.node = node;
> +
> earlycon_init(&early_console_dev, match->name);
> err = match->setup(&early_console_dev, options);
> earlycon_print_info(&early_console_dev);
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index cbd5070bc87f42aa450c4ca7af8a9b59fbe88574..3295721f33e482124fae8370b5889d5d6c012303 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -349,6 +349,7 @@ struct earlycon_device {
> struct uart_port port;
> char options[16]; /* e.g., 115200n8 */
> unsigned int baud;
> + unsigned long node;

That should not be an unsigned long, but rather an 'int'. Something got
messed up, of_setup_earlycon() should be changed to reflect this before
propagating the error to other places in the kernel.

And it's not really a "node" but an "offset", right?

thanks,

greg k-h