linux-kernel - Re: [PATCH] of: Preserve "of-display" device name for compatibility

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Message-ID: <a0aa122d-38a1-d4be-edc1-a49b4e5e9b6b@suse.de>
Date:   Tue, 11 Jul 2023 08:00:20 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Rob Herring <robh@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Michal Suchanek <msuchanek@...e.de>
Cc:     devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Helge Deller <deller@....de>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Cyril Brulebois <cyril@...amax.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] of: Preserve "of-display" device name for compatibility



Am 10.07.23 um 19:40 schrieb Rob Herring:
> Since commit 241d2fb56a18 ("of: Make OF framebuffer device names unique"),
> as spotted by Frédéric Bonnard, the historical "of-display" device is
> gone: the updated logic creates "of-display.0" instead, then as many
> "of-display.N" as required.
> 
> This means that offb no longer finds the expected device, which prevents
> the Debian Installer from setting up its interface, at least on ppc64el.
> 
> Fix this by keeping "of-display" for the first device and "of-display.N"
> for subsequent devices.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=217328
> Link: https://bugs.debian.org/1033058
> Fixes: 241d2fb56a18 ("of: Make OF framebuffer device names unique")
> Cc: stable@...r.kernel.org
> Cc: Cyril Brulebois <cyril@...amax.com>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Helge Deller <deller@....de>
> Signed-off-by: Rob Herring <robh@...nel.org>

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/of/platform.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index 051e29b7ad2b..0c3475e7d2ff 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -552,7 +552,7 @@ static int __init of_platform_default_populate_init(void)
>   			if (!of_get_property(node, "linux,opened", NULL) ||
>   			    !of_get_property(node, "linux,boot-display", NULL))
>   				continue;
> -			dev = of_platform_device_create(node, "of-display.0", NULL);
> +			dev = of_platform_device_create(node, "of-display", NULL);
>   			of_node_put(node);
>   			if (WARN_ON(!dev))
>   				return -ENOMEM;

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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