samples: drivers: led_strip: Remove length Kconfig

The chain-length DTS property is now mandatory, so remove the
optional Kconfig for setting the length

Signed-off-by: Jamie McCrae <spam@helper3000.net>

Author: thedjnK

samples/drivers/led_strip/Kconfig

@@ -9,14 +9,6 @@ config SAMPLE_LED_UPDATE_DELAY
 	help
 	  Delay between LED updates in ms.
 
-config SAMPLE_LED_STRIP_LENGTH
-	int "LED strip length"
-	default 0
-	help
-	  Number of LEDs in the strip.
-	  If the value is zero, use the 'chain-length' property in
-	  devicetree instead to determine LED numbers.
-
 endmenu
 
 source "Kconfig.zephyr"

samples/drivers/led_strip/README.rst

@@ -65,9 +65,6 @@ Building and Running
 The sample updates the LED strip periodically. The update frequency can be
 modified by changing the :kconfig:option:`CONFIG_SAMPLE_LED_UPDATE_DELAY`.
 
-If there is no chain-length property in the devicetree node, you need to set
-the number of LEDs in the :kconfig:option:`CONFIG_SAMPLE_LED_STRIP_LENGTH` option.
-
 Then build and flash the application:
 
 .. zephyr-app-commands::

samples/drivers/led_strip/boards/96b_carbon_stm32f401xe.conf

@@ -1,3 +1 @@
 CONFIG_SPI_STM32_INTERRUPT=y
-
-CONFIG_SAMPLE_LED_STRIP_LENGTH=1

samples/drivers/led_strip/boards/adafruit_itsybitsy.conf

@@ -1,3 +1,2 @@
 # Enable LED 5V Regulator
 CONFIG_REGULATOR=y
-CONFIG_SAMPLE_LED_STRIP_LENGTH=4

samples/drivers/led_strip/boards/adafruit_trinket_m0.conf

@@ -21,9 +21,7 @@ LOG_MODULE_REGISTER(main);
 
 #define STRIP_NODE		DT_ALIAS(led_strip)
 
-#if CONFIG_SAMPLE_LED_STRIP_LENGTH != 0
-#define STRIP_NUM_PIXELS	CONFIG_SAMPLE_LED_STRIP_LENGTH
-#elif DT_NODE_HAS_PROP(DT_ALIAS(led_strip), chain_length)
+#if DT_NODE_HAS_PROP(DT_ALIAS(led_strip), chain_length)
 #define STRIP_NUM_PIXELS	DT_PROP(DT_ALIAS(led_strip), chain_length)
 #else
 #error Unable to determine length of LED strip