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

On 1/7/26 05:42, Chintan Patel wrote:
> 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(+)

Whole v4 series applied to fbdev git tree.

Thanks!
Helge

On 1/11/26 10:50, Helge Deller wrote:
> On 1/7/26 05:42, Chintan Patel wrote:
>> 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(+)
> 
> Whole v4 series applied to fbdev git tree.
> 
Appreciate Helge and everyone who reviewed it! This was my first kernel 
series and it was good learning experience for me.

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)