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staging: fbtft: Make FB_DEVICE dependency optional

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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: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Chintan Patel 2026-01-06 20:42:55 -08:00 • committed by Helge Deller
parent 39b65316fe
commit 553d8a6e51
2 changed files with 20 additions and 5 deletions
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5
drivers/staging/fbtft/Kconfig
View file

@ -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

20
drivers/staging/fbtft/fbtft-sysfs.c
View file

@ -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]);
}