dm: adc: Add SPL_ADC Kconfig symbol for use of ADC in SPL

What model of Radxa ZERO 3W/3E board can be identified using ADC at
runtime, add a Kconfig symbol to allow use of ADC in SPL.

This will be used to identify board model in SPL to allow loading
correct FIT configuration and FDT for U-Boot proper at SPL phase.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

drivers/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 
+obj-$(CONFIG_$(SPL_TPL_)ADC) += adc/
 obj-$(CONFIG_$(SPL_TPL_)BIOSEMU) += bios_emulator/
 obj-$(CONFIG_$(SPL_TPL_)BLK) += block/
 obj-$(CONFIG_$(SPL_TPL_)BOOTCOUNT_LIMIT) += bootcount/
@@ -81,7 +82,6 @@ endif
 
 ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 
-obj-y += adc/
 obj-y += ata/
 obj-$(CONFIG_DM_DEMO) += demo/
 obj-y += block/

drivers/adc/Kconfig

@@ -1,5 +1,6 @@
 config ADC
 	bool "Enable ADC drivers using Driver Model"
+	depends on DM
 	help
 	  This enables ADC API for drivers, which allows driving ADC features
 	  by single and multi-channel methods for:
@@ -11,6 +12,10 @@ config ADC
 	  - support supply's phandle with auto-enable
 	  - supply polarity setting in fdt
 
+config SPL_ADC
+	bool "Enable ADC drivers using Driver Model in SPL"
+	depends on SPL_DM
+
 config ADC_EXYNOS
 	bool "Enable Exynos 54xx ADC driver"
 	depends on ADC

drivers/adc/Makefile

@@ -4,7 +4,7 @@
 # Przemyslaw Marczak <p.marczak@samsung.com>
 #
 
-obj-$(CONFIG_ADC) += adc-uclass.o
+obj-$(CONFIG_$(SPL_TPL_)ADC) += adc-uclass.o
 obj-$(CONFIG_ADC_EXYNOS) += exynos-adc.o
 obj-$(CONFIG_ADC_SANDBOX) += sandbox.o
 obj-$(CONFIG_SARADC_ROCKCHIP) += rockchip-saradc.o