[PATCH v3 2/4] staging: fbtft: Make FB_DEVICE dependency optional
From: Chintan Patel <hidden>
Date: 2025-12-30 05:29:07
Also in:
linux-fbdev, linux-omap, linux-staging, lkml
Subsystem:
fbtft framebuffer drivers, staging subsystem, the rest · Maintainers:
Andy Shevchenko, Greg Kroah-Hartman, Linus Torvalds
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> Signed-off-by: Chintan Patel <redacted> --- 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