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

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Date:   Mon, 10 Jul 2023 11:40:07 -0600
From:   Rob Herring <robh@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>,
        Michal Suchanek <msuchanek@...e.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        stable@...r.kernel.org, Cyril Brulebois <cyril@...amax.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Helge Deller <deller@....de>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] of: Preserve "of-display" device name for compatibility

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>
---
 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;
-- 
2.40.1