wifi: rtw89: add multicolor LED support for RTL8852CU valve board

Add multicolor LED support for the RTL8852CU valve board to reflect
wireless connection status (by default, green LED is ON when associated
and OFF when disconnected).

Extend the rtw89 LED subsystem with a multicolor path via led_classdev_mc,
for board-level variants with more than one LED GPIO channel.

Add a new RTW89_LEDS_MC Kconfig option and support multicolor LEDs
through led_classdev_mc, with per-channel caching to minimize
redundant register writes. The RTL8852CU valve board is wired up as
the first user, driving a multicolor WRGB LED over four GPIO channels
(8, 18, 16, and 17) that map to LED_COLOR_ID_WHITE/RED/GREEN/BLUE.

Usage:
- Auto-triggered (default):
  Green LED ON when connected, OFF when disconnected

- Manual override (e.g., set red; channel order: WHITE RED GREEN BLUE):
    echo "0 1 0 0" > /sys/class/leds/rtw89-phyX-multicolor/multi_intensity
    echo 1         > /sys/class/leds/rtw89-phyX-multicolor/brightness

Signed-off-by: Johnson Tsai <wenjie.tsai@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260717061910.54466-3-pkshih@realtek.com

0 files changed, 0 insertions, 0 deletions