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

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Message-ID: <YuKfaVG/ZbYtFjS/@kroah.com>
Date:   Thu, 28 Jul 2022 16:38:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Markuss Broks <markuss.broks@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Helge Deller <deller@....de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Borislav Petkov <bp@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Wei Ming Chen <jj251510319013@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tony Lindgren <tony@...mide.com>, linux-doc@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Petr Mladek <pmladek@...e.com>
Subject: Re: [PATCH 1/2] drivers: serial: earlycon: Pass device-tree node

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@...il.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