generic: backport support for KTD2026/7 rgb(w) led controller

This commit adds the Linux kernel mainline driver "leds-ktd202x" for the
KinetIC KTD2026 and KTD2027 RGB/RBGW controller with I2C interface that was
introduced in kernel version 6.7, last changed in mainline on 2024-05-31.

At least the Acer Connect Vero W6m (a variant of the Acer Predator Connect
W6 without 2.5G eth1 port, usb3 port, and the 6 on-board gpio RGB LEDs) is
equipped with a KTD2026 (and a single RGB LED attached to it used by the
stock firmware as status LED), and maybe other router devices also are.

Signed-off-by: George Oldfort <[email protected]>
Link: openwrt/openwrt#16860
Signed-off-by: Hauke Mehrtens <[email protected]>

Author: goldwrt

package/kernel/linux/modules/leds.mk

@@ -147,6 +147,24 @@ endef
 $(eval $(call KernelPackage,leds-apu))
 
 
+define KernelPackage/leds-ktd202x
+  SUBMENU:=LED modules
+  TITLE:=LED support for KTD202x Chips
+  DEPENDS:=+kmod-i2c-core +kmod-regmap-i2c
+  KCONFIG:=CONFIG_LEDS_KTD202X
+  FILES:= $(LINUX_DIR)/drivers/leds/rgb/leds-ktd202x.ko
+  AUTOLOAD:=$(call AutoProbe,leds-ktd202x,1)
+endef
+
+define KernelPackage/leds-ktd202x/description
+  This option enables support for the Kinetic KTD2026/KTD2027
+  RGB/White LED driver found in different BQ mobile phones.
+  It is a 3 or 4 channel LED driver programmed via an I2C interface.
+endef
+
+$(eval $(call KernelPackage,leds-ktd202x))
+
+
 define KernelPackage/leds-mlxcpld
   SUBMENU:=$(LEDS_MENU)
   TITLE:=LED support for the Mellanox boards