power: Add CONFIG_SPL_POWER_DOMAIN config

Add CONFIG_SPL_POWER_DOMAIN config entry.
Build drivers/power/domain if this config is selected.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/spl/Kconfig

@@ -609,6 +609,15 @@ config SPL_POWER_SUPPORT
 	  in drivers/power, drivers/power/pmic and drivers/power/regulator
 	  as part of an SPL build.
 
+config SPL_POWER_DOMAIN
+	bool "Support power domain drivers"
+	help
+	  Enable support for power domain control in SPL. Many SoCs allow
+	  power to be applied to or removed from portions of the SoC (power
+	  domains). This may be used to save power. This API provides the
+	  means to control such power management hardware. This enables
+	  the drivers in drivers/power/domain as part of a SPL build.
+
 config SPL_RAM_SUPPORT
 	bool "Support booting from RAM"
 	default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ

drivers/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_ARMADA_XP) += ddr/marvell/axp/
 obj-$(CONFIG_ALTERA_SDRAM) += ddr/altera/
 obj-$(CONFIG_SPL_POWER_SUPPORT) += power/ power/pmic/
 obj-$(CONFIG_SPL_POWER_SUPPORT) += power/regulator/
+obj-$(CONFIG_SPL_POWER_DOMAIN) += power/domain/
 obj-$(CONFIG_SPL_DM_RESET) += reset/
 obj-$(CONFIG_SPL_MTD_SUPPORT) += mtd/
 obj-$(CONFIG_SPL_ONENAND_SUPPORT) += mtd/onenand/

drivers/power/domain/Makefile

@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: GPL-2.0
 
-obj-$(CONFIG_POWER_DOMAIN) += power-domain-uclass.o
+obj-$(CONFIG_$(SPL_)POWER_DOMAIN) += power-domain-uclass.o
 obj-$(CONFIG_BCM6328_POWER_DOMAIN) += bcm6328-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
 obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o