drm/sysfb: Split source file

Split drm_sysfb_helper.c into two source files. There's now one
source file for the mode-setting pipeline and one source file for
module meta data. Prepares for adding additional source code to
sysfb helpers.

v2:
- fix typo in commit message (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250410083834.10810-2-tzimmermann@suse.de

drivers/gpu/drm/sysfb/Makefile

@@ -1,5 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+drm_sysfb_helper-y := \
+	drm_sysfb.o \
+	drm_sysfb_modeset.o
 obj-$(CONFIG_DRM_SYSFB_HELPER)	+= drm_sysfb_helper.o
 
 obj-$(CONFIG_DRM_EFIDRM)	+= efidrm.o

drivers/gpu/drm/sysfb/drm_sysfb.c

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/module.h>
+
+#include "drm_sysfb_helper.h"
+
+MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
+MODULE_LICENSE("GPL");

drivers/gpu/drm/sysfb/drm_sysfb_helper.h

@@ -11,6 +11,11 @@
 #include <drm/drm_modes.h>
 
 struct drm_format_info;
+struct drm_scanout_buffer;
+
+/*
+ * Display modes
+ */
 
 struct drm_display_mode drm_sysfb_mode(unsigned int width,
 				       unsigned int height,

drivers/gpu/drm/sysfb/drm_sysfb_modeset.c

@@ -2,7 +2,6 @@
 
 #include <linux/export.h>
 #include <linux/slab.h>
-#include <linux/module.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
@@ -20,9 +19,6 @@
 
 #include "drm_sysfb_helper.h"
 
-MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
-MODULE_LICENSE("GPL");
-
 struct drm_display_mode drm_sysfb_mode(unsigned int width,
 				       unsigned int height,
 				       unsigned int width_mm,