Store backlight breathing state in EEPROM (#6105)

* Store backlight breathing state in EEPROM

* Reduce backlight_config.level from 6 bits to 4 (max 15 "on" levels)

* Error out if BACKLIGHT_LEVELS is > 15

* Remove mention of default backlight pin in rules.mk template

* Remove pointless comment

2 files changed, 1 insertions, 3 deletions

diff --git a/quantum/template/avr/config.h b/quantum/template/avr/config.h
index 1e41a2d31..fc65bb597 100644
--- a/quantum/template/avr/config.h
+++ b/quantum/template/avr/config.h
@@ -91,8 +91,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* define if matrix has ghost (lacks anti-ghosting diodes) */
 //#define MATRIX_HAS_GHOST
 
-/* number of backlight levels */
-
 /* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
 #define LOCKING_SUPPORT_ENABLE
 /* Locking resynchronize hack */
diff --git a/quantum/template/avr/rules.mk b/quantum/template/avr/rules.mk
index bc370be03..133c9e363 100644
--- a/quantum/template/avr/rules.mk
+++ b/quantum/template/avr/rules.mk
@@ -70,7 +70,7 @@ COMMAND_ENABLE = yes        # Commands for debug and configuration
 SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
 # if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
 NKRO_ENABLE = no            # USB Nkey Rollover
-BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
 RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
 UNICODE_ENABLE = no         # Unicode