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common: add fdt_simplefb_enable_and_mem_rsv function

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Add a new function to activate an existing simple frame buffer node
and add the associated reserved memory, with no-map properties.

This device tree update is only done when the video device is active
and the video buffer is used.

This patch uses '#if CONFIG_IS_ENABLED(DM_VIDEO)' because
gd->video_bottom and gd->video_top are only defined when CONFIG_DM_VIDEO
is activated.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrick Delaunay 2021-11-15 16:32:21 +01:00 committed by Patrice Chotard
parent 2e2e6d8cac
commit 77debf61ef
2 changed files with 28 additions and 0 deletions
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27
common/fdt_simplefb.c
View file

@ -89,3 +89,30 @@ int fdt_simplefb_enable_existing_node(void *blob)
return fdt_simplefb_configure_node(blob, off);
}
#if CONFIG_IS_ENABLED(DM_VIDEO)
int fdt_simplefb_enable_and_mem_rsv(void *blob)
{
struct fdt_memory mem;
int ret;
/* nothing to do when video is not active */
if (!video_is_active())
return 0;
ret = fdt_simplefb_enable_existing_node(blob);
if (ret)
return ret;
/* nothing to do when the frame buffer is not defined */
if (gd->video_bottom == gd->video_top)
return 0;
/* reserved with no-map tag the video buffer */
mem.start = gd->video_bottom;
mem.end = gd->video_top - 1;
return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
FDTDEC_RESERVED_MEMORY_NO_MAP);
}
#endif

1
include/fdt_simplefb.h
View file

@ -10,4 +10,5 @@
#define _FDT_SIMPLEFB_H_
int fdt_simplefb_add_node(void *blob);
int fdt_simplefb_enable_existing_node(void *blob);
int fdt_simplefb_enable_and_mem_rsv(void *blob);
#endif