[PATCH v2 013/169] button: Add a Kconfig for SPL_BUTTON

[Simon Glass]

This is implicitly used in the source and seems useful, so add it.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 drivers/button/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/button/Kconfig b/drivers/button/Kconfig
index 8ce2de37d62..60645a7745a 100644
--- a/drivers/button/Kconfig
+++ b/drivers/button/Kconfig
@@ -9,6 +9,10 @@ config BUTTON
 	  can provide access to board-specific buttons. Use of the device tree
 	  for configuration is encouraged.
 
+config SPL_BUTTON
+	def_bool n  # Enable button support (SPL)
+	depends on SPL
+
 config BUTTON_ADC
 	bool "Button adc"
 	depends on BUTTON
-- 
2.39.1.519.gcb327c4b5f-goog