linux-kernel - [PATCH v4 0/4] fbdev: Make CONFIG_FB

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Message-ID: <20260107044258.528624-1-chintanlike@gmail.com>
Date: Tue,  6 Jan 2026 20:42:53 -0800
From: Chintan Patel <chintanlike@...il.com>
To: linux-fbdev@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-omap@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	tzimmermann@...e.de,
	andy@...nel.org,
	deller@....de,
	gregkh@...uxfoundation.org,
	Chintan Patel <chintanlike@...il.com>
Subject: [PATCH v4 0/4] fbdev: Make CONFIG_FB_DEVICE optional for drivers

This series makes CONFIG_FB_DEVICE optional for fbdev drivers that use
it only for sysfs interfaces, addressing Thomas Zimmermann’s TODO to
remove hard FB_DEVICE dependencies.

The series introduces a small helper, dev_of_fbinfo(), which returns
NULL when CONFIG_FB_DEVICE=n. This allows sysfs code paths to be skipped
via runtime checks, avoids #ifdef CONFIG_FB_DEVICE clutter, and keeps
full compile-time syntax checking.

Signed-off-by: Chintan Patel <chintanlike@...il.com>
---
Changes in v4:
- PTR_IF() was removed and overlay sysfs is now optional via __maybe_unused 
  and #ifdef CONFIG_FB_DEVICE (suggested by Helge Deller)
- Decouple variable definition and assignment in 
  omapfb_remove/create_sysfs (suggested by Andy Shevchenko)
- Added Reviewed-by tags:
  - fb: Add dev_of_fbinfo(): Helge Deller, Andy Shevchenko
  - staging: fbtft: Helge Deller

Changes in v3:
- Use PTR_IF() to conditionally include overlay_sysfs_group in 
  overlay_sysfs_groups(suggested by Andy Shevchenko)
- Decouple variable definition and assignment in 
  fbtft_sysfs_init/exit(suggested by Andy Shevchenko)

Changes in v2:
- Add dev_of_fbinfo() helper (suggested by Helge Deller)
- Replace #ifdef CONFIG_FB_DEVICE blocks with runtime NULL checks
- Switch to fb_dbg() / fb_info() logging (suggested by Thomas Zimmermann)

---

Chintan Patel (4):
  fb: Add dev_of_fbinfo() helper for optional sysfs support
  staging: fbtft: Make FB_DEVICE dependency optional
  fbdev: omapfb: Make FB_DEVICE dependency optional
  fbdev: sh_mobile_lcdc: Make FB_DEVICE dependency optional

 drivers/staging/fbtft/Kconfig                 |  5 ++++-
 drivers/staging/fbtft/fbtft-sysfs.c           | 20 +++++++++++++++----
 drivers/video/fbdev/omap2/omapfb/Kconfig      |  3 ++-
 .../video/fbdev/omap2/omapfb/omapfb-sysfs.c   | 18 +++++++++++++----
 drivers/video/fbdev/sh_mobile_lcdcfb.c        |  5 ++++-
 include/linux/fb.h                            |  9 +++++++++
 6 files changed, 49 insertions(+), 11 deletions(-)

-- 
2.43.0