meta-openembedded/meta-oe/recipes-graphics/lvgl/files/0003-Make-fbdev-device-node-runtime-configurable-via-envi.patch

From 85d90749a10b5f91741d37b75825935bf7cc4fb3 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Tue, 12 Mar 2024 03:00:37 +0100
Subject: [PATCH 3/6] Make fbdev device node runtime configurable via
 environment variable

Test whether $LV_VIDEO_CARD environment variable is non-NULL and in
case it is, use it as the video card file in lv_linux_fbdev_set_file().
Otherwise fall back to /dev/fb0, i.e. the current behavior. This way,
it is possible to test LVGL on systems with multiple fbdev devices.

Upstream-Status: Submitted [https://github.com/lvgl/lv_port_linux_frame_buffer/pull/47]
Signed-off-by: Marek Vasut <marex@denx.de>
---
 main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/main.c b/main.c
index 9775b9c..b64a098 100644
--- a/main.c
+++ b/main.c
@@ -4,13 +4,19 @@
 #include <pthread.h>
 #include <time.h>
 
+static const char *lv_linux_get_video_card_node(const char *videocard_default)
+{
+    return getenv("LV_VIDEO_CARD") ? : videocard_default;
+}
+
 int main(void)
 {
+    const char *videocard = lv_linux_get_video_card_node("/dev/fb0");
     lv_init();
 
     /*Linux frame buffer device init*/
     lv_display_t * disp = lv_linux_fbdev_create();
-    lv_linux_fbdev_set_file(disp, "/dev/fb0");
+    lv_linux_fbdev_set_file(disp, videocard);
 
     /*Create a Demo*/
     lv_demo_widgets();
-- 
2.43.0