[PATCH v4 0/4] fbdev: Make CONFIG_FB_DEVICE optional for drivers

[PATCH v4 0/4] fbdev: Make CONFIG_FB_DEVICE optional for drivers

[Chintan Patel]

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@gmail.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

[PATCH v4 1/4] fb: Add dev_of_fbinfo() helper for optional sysfs support

[Chintan Patel]

Add dev_of_fbinfo() to return the framebuffer struct device when
CONFIG_FB_DEVICE is enabled, or NULL otherwise.

This allows fbdev drivers to use sysfs interfaces via runtime checks
instead of CONFIG_FB_DEVICE ifdefs, keeping the code clean while
remaining fully buildable.

Suggested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Chintan Patel <chintanlike@gmail.com>
---
 include/linux/fb.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/fb.h b/include/linux/fb.h
index 05cc251035da..dad3fb61a06a 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -628,6 +628,15 @@ static inline void unlock_fb_info(struct fb_info *info)
 	mutex_unlock(&info->lock);
 }
 
+static inline struct device *dev_of_fbinfo(const struct fb_info *info)
+{
+#ifdef CONFIG_FB_DEVICE
+	return info->dev;
+#else
+	return NULL;
+#endif
+}
+
 static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
 					   u8 *src, u32 s_pitch, u32 height)
 {
-- 
2.43.0

[PATCH v4 2/4] staging: fbtft: Make FB_DEVICE dependency optional

[Chintan Patel]

fbtft provides sysfs interfaces for debugging and gamma configuration,
but these are not required for the core driver.

Drop the hard dependency on CONFIG_FB_DEVICE and make sysfs support
optional by using dev_of_fbinfo() at runtime. When FB_DEVICE is disabled,
sysfs operations are skipped while the code remains buildable and
type-checked.

Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Suggested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Chintan Patel <chintanlike@gmail.com>
---
 drivers/staging/fbtft/Kconfig       |  5 ++++-
 drivers/staging/fbtft/fbtft-sysfs.c | 20 ++++++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
index c2655768209a..578412a2f379 100644
--- a/drivers/staging/fbtft/Kconfig
+++ b/drivers/staging/fbtft/Kconfig
@@ -2,11 +2,14 @@
 menuconfig FB_TFT
 	tristate "Support for small TFT LCD display modules"
 	depends on FB && SPI
-	depends on FB_DEVICE
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on GPIOLIB || COMPILE_TEST
 	select FB_BACKLIGHT
 	select FB_SYSMEM_HELPERS_DEFERRED
+	help
+	  Support for small TFT LCD display modules over SPI bus. FB_DEVICE
+	  is not required, but if enabled, provides sysfs interface for debugging
+	  and gamma curve configuration.
 
 if FB_TFT
 
diff --git a/drivers/staging/fbtft/fbtft-sysfs.c b/drivers/staging/fbtft/fbtft-sysfs.c
index e45c90a03a90..d05599d80011 100644
--- a/drivers/staging/fbtft/fbtft-sysfs.c
+++ b/drivers/staging/fbtft/fbtft-sysfs.c
@@ -203,14 +203,26 @@ static struct device_attribute debug_device_attr =
 
 void fbtft_sysfs_init(struct fbtft_par *par)
 {
-	device_create_file(par->info->dev, &debug_device_attr);
+	struct device *dev;
+
+	dev = dev_of_fbinfo(par->info);
+	if (!dev)
+		return;
+
+	device_create_file(dev, &debug_device_attr);
 	if (par->gamma.curves && par->fbtftops.set_gamma)
-		device_create_file(par->info->dev, &gamma_device_attrs[0]);
+		device_create_file(dev, &gamma_device_attrs[0]);
 }
 
 void fbtft_sysfs_exit(struct fbtft_par *par)
 {
-	device_remove_file(par->info->dev, &debug_device_attr);
+	struct device *dev;
+
+	dev = dev_of_fbinfo(par->info);
+	if (!dev)
+		return;
+
+	device_remove_file(dev, &debug_device_attr);
 	if (par->gamma.curves && par->fbtftops.set_gamma)
-		device_remove_file(par->info->dev, &gamma_device_attrs[0]);
+		device_remove_file(dev, &gamma_device_attrs[0]);
 }
-- 
2.43.0

[PATCH v4 3/4] fbdev: omapfb: Make FB_DEVICE dependency optional

[Chintan Patel]

omapfb provides several sysfs interfaces for framebuffer configuration
and debugging, but these are not required for the core driver.

Remove the hard dependency on CONFIG_FB_DEVICE and make sysfs support
optional by using dev_of_fbinfo() to obtain the backing device at runtime.
When FB_DEVICE is disabled, sysfs operations are skipped while the code
still builds and is type-checked.

Suggested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Chintan Patel <chintanlike@gmail.com>
---
 drivers/video/fbdev/omap2/omapfb/Kconfig       |  3 ++-
 .../video/fbdev/omap2/omapfb/omapfb-sysfs.c    | 18 ++++++++++++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/omap2/omapfb/Kconfig b/drivers/video/fbdev/omap2/omapfb/Kconfig
index f4cdf999a080..2d20e79adefc 100644
--- a/drivers/video/fbdev/omap2/omapfb/Kconfig
+++ b/drivers/video/fbdev/omap2/omapfb/Kconfig
@@ -5,7 +5,6 @@ config OMAP2_VRFB
 menuconfig FB_OMAP2
 	tristate "OMAP2+ frame buffer support"
 	depends on FB
-	depends on FB_DEVICE
 	depends on DRM_OMAP = n
 	depends on GPIOLIB
 	select FB_OMAP2_DSS
@@ -13,6 +12,8 @@ menuconfig FB_OMAP2
 	select FB_IOMEM_HELPERS
 	help
 	  Frame buffer driver for OMAP2+ based boards.
+	  FB_DEVICE is not required, but if enabled, provides sysfs interface
+	  for framebuffer configuration and debugging.
 
 if FB_OMAP2
 
diff --git a/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c b/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
index 831b2c2fbdf9..38a635d38d58 100644
--- a/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
+++ b/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
@@ -558,10 +558,15 @@ int omapfb_create_sysfs(struct omapfb2_device *fbdev)
 
 	DBG("create sysfs for fbs\n");
 	for (i = 0; i < fbdev->num_fbs; i++) {
+		struct device *dev;
 		int t;
+
+		dev = dev_of_fbinfo(fbdev->fbs[i]);
+		if (!dev)
+			continue;
+
 		for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++) {
-			r = device_create_file(fbdev->fbs[i]->dev,
-					&omapfb_attrs[t]);
+			r = device_create_file(dev, &omapfb_attrs[t]);
 
 			if (r) {
 				dev_err(fbdev->dev, "failed to create sysfs "
@@ -580,9 +585,14 @@ void omapfb_remove_sysfs(struct omapfb2_device *fbdev)
 
 	DBG("remove sysfs for fbs\n");
 	for (i = 0; i < fbdev->num_fbs; i++) {
+		struct device *dev;
+
+		dev = dev_of_fbinfo(fbdev->fbs[i]);
+		if (!dev)
+			continue;
+
 		for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++)
-			device_remove_file(fbdev->fbs[i]->dev,
-					&omapfb_attrs[t]);
+			device_remove_file(dev, &omapfb_attrs[t]);
 	}
 }
 
-- 
2.43.0

[PATCH v4 4/4] fbdev: sh_mobile_lcdc: Make FB_DEVICE dependency optional

[Chintan Patel]

The sh_mobile_lcdc driver exposes overlay configuration via sysfs, but the
core driver does not require CONFIG_FB_DEVICE.

Make overlay sysfs optional so that the driver can build and operate
even when FB_DEVICE is disabled. The kernel naturally ignores the
missing attribute group, preserving buildability and type safety.

Suggested-by: Helge Deller <deller@gmx.de>
Signed-off-by: Chintan Patel <chintanlike@gmail.com>
---
 drivers/video/fbdev/sh_mobile_lcdcfb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
index dd950e4ab5ce..5f3a0cd27db3 100644
--- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
+++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
@@ -1343,14 +1343,17 @@ static DEVICE_ATTR_RW(overlay_mode);
 static DEVICE_ATTR_RW(overlay_position);
 static DEVICE_ATTR_RW(overlay_rop3);
 
-static struct attribute *overlay_sysfs_attrs[] = {
+static struct attribute *overlay_sysfs_attrs[] __maybe_unused = {
 	&dev_attr_overlay_alpha.attr,
 	&dev_attr_overlay_mode.attr,
 	&dev_attr_overlay_position.attr,
 	&dev_attr_overlay_rop3.attr,
 	NULL,
 };
+
+#ifdef CONFIG_FB_DEVICE
 ATTRIBUTE_GROUPS(overlay_sysfs);
+#endif
 
 static const struct fb_fix_screeninfo sh_mobile_lcdc_overlay_fix  = {
 	.id =		"SH Mobile LCDC",
-- 
2.43.0

Re: [PATCH v4 1/4] fb: Add dev_of_fbinfo() helper for optional sysfs support

[Thomas Zimmermann]

Am 07.01.26 um 05:42 schrieb Chintan Patel:
> Add dev_of_fbinfo() to return the framebuffer struct device when
> CONFIG_FB_DEVICE is enabled, or NULL otherwise.
>
> This allows fbdev drivers to use sysfs interfaces via runtime checks
> instead of CONFIG_FB_DEVICE ifdefs, keeping the code clean while
> remaining fully buildable.
>
> Suggested-by: Helge Deller <deller@gmx.de>
> Reviewed-by: Helge Deller <deller@gmx.de>
> Reviewed-by: Andy Shevchenko <andy@kernel.org>
> Signed-off-by: Chintan Patel <chintanlike@gmail.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   include/linux/fb.h | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index 05cc251035da..dad3fb61a06a 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -628,6 +628,15 @@ static inline void unlock_fb_info(struct fb_info *info)
>   	mutex_unlock(&info->lock);
>   }
>   
> +static inline struct device *dev_of_fbinfo(const struct fb_info *info)
> +{
> +#ifdef CONFIG_FB_DEVICE
> +	return info->dev;
> +#else
> +	return NULL;
> +#endif
> +}
> +
>   static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
>   					   u8 *src, u32 s_pitch, u32 height)
>   {

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)

Re: [PATCH v4 2/4] staging: fbtft: Make FB_DEVICE dependency optional

[Thomas Zimmermann]

Am 07.01.26 um 05:42 schrieb Chintan Patel:
> fbtft provides sysfs interfaces for debugging and gamma configuration,
> but these are not required for the core driver.
>
> Drop the hard dependency on CONFIG_FB_DEVICE and make sysfs support
> optional by using dev_of_fbinfo() at runtime. When FB_DEVICE is disabled,
> sysfs operations are skipped while the code remains buildable and
> type-checked.
>
> Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
> Suggested-by: Helge Deller <deller@gmx.de>
> Reviewed-by: Helge Deller <deller@gmx.de>
> Signed-off-by: Chintan Patel <chintanlike@gmail.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/staging/fbtft/Kconfig       |  5 ++++-
>   drivers/staging/fbtft/fbtft-sysfs.c | 20 ++++++++++++++++----
>   2 files changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/fbtft/Kconfig b/drivers/staging/fbtft/Kconfig
> index c2655768209a..578412a2f379 100644
> --- a/drivers/staging/fbtft/Kconfig
> +++ b/drivers/staging/fbtft/Kconfig
> @@ -2,11 +2,14 @@
>   menuconfig FB_TFT
>   	tristate "Support for small TFT LCD display modules"
>   	depends on FB && SPI
> -	depends on FB_DEVICE
>   	depends on BACKLIGHT_CLASS_DEVICE
>   	depends on GPIOLIB || COMPILE_TEST
>   	select FB_BACKLIGHT
>   	select FB_SYSMEM_HELPERS_DEFERRED
> +	help
> +	  Support for small TFT LCD display modules over SPI bus. FB_DEVICE
> +	  is not required, but if enabled, provides sysfs interface for debugging
> +	  and gamma curve configuration.
>   
>   if FB_TFT
>   
> diff --git a/drivers/staging/fbtft/fbtft-sysfs.c b/drivers/staging/fbtft/fbtft-sysfs.c
> index e45c90a03a90..d05599d80011 100644
> --- a/drivers/staging/fbtft/fbtft-sysfs.c
> +++ b/drivers/staging/fbtft/fbtft-sysfs.c
> @@ -203,14 +203,26 @@ static struct device_attribute debug_device_attr =
>   
>   void fbtft_sysfs_init(struct fbtft_par *par)
>   {
> -	device_create_file(par->info->dev, &debug_device_attr);
> +	struct device *dev;
> +
> +	dev = dev_of_fbinfo(par->info);
> +	if (!dev)
> +		return;
> +
> +	device_create_file(dev, &debug_device_attr);
>   	if (par->gamma.curves && par->fbtftops.set_gamma)
> -		device_create_file(par->info->dev, &gamma_device_attrs[0]);
> +		device_create_file(dev, &gamma_device_attrs[0]);
>   }
>   
>   void fbtft_sysfs_exit(struct fbtft_par *par)
>   {
> -	device_remove_file(par->info->dev, &debug_device_attr);
> +	struct device *dev;
> +
> +	dev = dev_of_fbinfo(par->info);
> +	if (!dev)
> +		return;
> +
> +	device_remove_file(dev, &debug_device_attr);
>   	if (par->gamma.curves && par->fbtftops.set_gamma)
> -		device_remove_file(par->info->dev, &gamma_device_attrs[0]);
> +		device_remove_file(dev, &gamma_device_attrs[0]);
>   }

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)

Re: [PATCH v4 3/4] fbdev: omapfb: Make FB_DEVICE dependency optional

[Thomas Zimmermann]

Am 07.01.26 um 05:42 schrieb Chintan Patel:
> omapfb provides several sysfs interfaces for framebuffer configuration
> and debugging, but these are not required for the core driver.
>
> Remove the hard dependency on CONFIG_FB_DEVICE and make sysfs support
> optional by using dev_of_fbinfo() to obtain the backing device at runtime.
> When FB_DEVICE is disabled, sysfs operations are skipped while the code
> still builds and is type-checked.
>
> Suggested-by: Helge Deller <deller@gmx.de>
> Signed-off-by: Chintan Patel <chintanlike@gmail.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/video/fbdev/omap2/omapfb/Kconfig       |  3 ++-
>   .../video/fbdev/omap2/omapfb/omapfb-sysfs.c    | 18 ++++++++++++++----
>   2 files changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/video/fbdev/omap2/omapfb/Kconfig b/drivers/video/fbdev/omap2/omapfb/Kconfig
> index f4cdf999a080..2d20e79adefc 100644
> --- a/drivers/video/fbdev/omap2/omapfb/Kconfig
> +++ b/drivers/video/fbdev/omap2/omapfb/Kconfig
> @@ -5,7 +5,6 @@ config OMAP2_VRFB
>   menuconfig FB_OMAP2
>   	tristate "OMAP2+ frame buffer support"
>   	depends on FB
> -	depends on FB_DEVICE
>   	depends on DRM_OMAP = n
>   	depends on GPIOLIB
>   	select FB_OMAP2_DSS
> @@ -13,6 +12,8 @@ menuconfig FB_OMAP2
>   	select FB_IOMEM_HELPERS
>   	help
>   	  Frame buffer driver for OMAP2+ based boards.
> +	  FB_DEVICE is not required, but if enabled, provides sysfs interface
> +	  for framebuffer configuration and debugging.
>   
>   if FB_OMAP2
>   
> diff --git a/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c b/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
> index 831b2c2fbdf9..38a635d38d58 100644
> --- a/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
> +++ b/drivers/video/fbdev/omap2/omapfb/omapfb-sysfs.c
> @@ -558,10 +558,15 @@ int omapfb_create_sysfs(struct omapfb2_device *fbdev)
>   
>   	DBG("create sysfs for fbs\n");
>   	for (i = 0; i < fbdev->num_fbs; i++) {
> +		struct device *dev;
>   		int t;
> +
> +		dev = dev_of_fbinfo(fbdev->fbs[i]);
> +		if (!dev)
> +			continue;
> +
>   		for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++) {
> -			r = device_create_file(fbdev->fbs[i]->dev,
> -					&omapfb_attrs[t]);
> +			r = device_create_file(dev, &omapfb_attrs[t]);
>   
>   			if (r) {
>   				dev_err(fbdev->dev, "failed to create sysfs "
> @@ -580,9 +585,14 @@ void omapfb_remove_sysfs(struct omapfb2_device *fbdev)
>   
>   	DBG("remove sysfs for fbs\n");
>   	for (i = 0; i < fbdev->num_fbs; i++) {
> +		struct device *dev;
> +
> +		dev = dev_of_fbinfo(fbdev->fbs[i]);
> +		if (!dev)
> +			continue;
> +
>   		for (t = 0; t < ARRAY_SIZE(omapfb_attrs); t++)
> -			device_remove_file(fbdev->fbs[i]->dev,
> -					&omapfb_attrs[t]);
> +			device_remove_file(dev, &omapfb_attrs[t]);
>   	}
>   }
>   

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)

Re: [PATCH v4 4/4] fbdev: sh_mobile_lcdc: Make FB_DEVICE dependency optional

[Thomas Zimmermann]

Am 07.01.26 um 05:42 schrieb Chintan Patel:
> The sh_mobile_lcdc driver exposes overlay configuration via sysfs, but the
> core driver does not require CONFIG_FB_DEVICE.
>
> Make overlay sysfs optional so that the driver can build and operate
> even when FB_DEVICE is disabled. The kernel naturally ignores the
> missing attribute group, preserving buildability and type safety.
>
> Suggested-by: Helge Deller <deller@gmx.de>
> Signed-off-by: Chintan Patel <chintanlike@gmail.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   drivers/video/fbdev/sh_mobile_lcdcfb.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> index dd950e4ab5ce..5f3a0cd27db3 100644
> --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> @@ -1343,14 +1343,17 @@ static DEVICE_ATTR_RW(overlay_mode);
>   static DEVICE_ATTR_RW(overlay_position);
>   static DEVICE_ATTR_RW(overlay_rop3);
>   
> -static struct attribute *overlay_sysfs_attrs[] = {
> +static struct attribute *overlay_sysfs_attrs[] __maybe_unused = {
>   	&dev_attr_overlay_alpha.attr,
>   	&dev_attr_overlay_mode.attr,
>   	&dev_attr_overlay_position.attr,
>   	&dev_attr_overlay_rop3.attr,
>   	NULL,
>   };
> +
> +#ifdef CONFIG_FB_DEVICE
>   ATTRIBUTE_GROUPS(overlay_sysfs);
> +#endif
>   
>   static const struct fb_fix_screeninfo sh_mobile_lcdc_overlay_fix  = {
>   	.id =		"SH Mobile LCDC",

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)

Re: [PATCH v4 2/4] staging: fbtft: Make FB_DEVICE dependency optional

[Andy Shevchenko]

On Tue, Jan 06, 2026 at 08:42:55PM -0800, Chintan Patel wrote:
> fbtft provides sysfs interfaces for debugging and gamma configuration,
> but these are not required for the core driver.
> 
> Drop the hard dependency on CONFIG_FB_DEVICE and make sysfs support
> optional by using dev_of_fbinfo() at runtime. When FB_DEVICE is disabled,
> sysfs operations are skipped while the code remains buildable and
> type-checked.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>

-- 
With Best Regards,
Andy Shevchenko