button: add missing ADC dependency for BUTTON_ADC

The BUTTON_ADC symbol guards the compilation of button-adc driver whose
name very well makes it explicit that it requires ADC support to be
enabled.

Fix build issue of button-adc driver when ADC support isn't enabled by
making sure it cannot be built without ADC support.

Cc: Quentin Schulz <foss+uboot@0leil.net>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>

diff --git a/drivers/button/Kconfig b/drivers/button/Kconfig
index 097b05f822e74de2c1b84e7c8d07344418bf8905..3918b05ae03e0714b56f376bc81b231c2f3068df 100644 (file)
--- a/drivers/button/Kconfig
+++ b/drivers/button/Kconfig
@@ -12,6 +12,7 @@ config BUTTON
 config BUTTON_ADC
        bool "Button adc"
        depends on BUTTON
+       depends on ADC
        help
          Enable support for buttons which are connected to Analog to Digital
          Converter device. The ADC driver must use driver model. Buttons are