dm: power: Allow regulators to be omitted from SPL

For some boards the pmic interface is useful but the regulator interface
(which comes with it) is too large. Allow them to be separated such that
SPL can decide which it needs.

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

drivers/power/pmic/Kconfig

@@ -10,6 +10,27 @@ config DM_PMIC
 	- 'drivers/power/pmic/pmic-uclass.c'
 	- 'include/power/pmic.h'
 
+config PMIC_CHILDREN
+	bool "Allow child devices for PMICs"
+	depends on DM_PMIC
+	default y
+	---help---
+	This allows PMICs to support child devices (such as regulators) in
+	SPL. This adds quite a bit of code so if you are not using this
+	feature you can turn it off. Most likely you should turn it on for
+	U-Boot proper.
+
+config SPL_PMIC_CHILDREN
+	bool "Allow child devices for PMICs in SPL"
+	depends on DM_PMIC
+	default y
+	---help---
+	This allows PMICs to support child devices (such as regulators) in
+	SPL. This adds quite a bit of code so if you are not using this
+	feature you can turn it off. In this case you may need a 'back door'
+	to call your regulator code (e.g. see rk808.c for direct functions
+	for use in SPL).
+
 config PMIC_ACT8846
 	bool "Enable support for the active-semi 8846 PMIC"
 	depends on DM_PMIC && DM_I2C

drivers/power/pmic/pmic-uclass.c

@@ -18,6 +18,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#if CONFIG_IS_ENABLED(PMIC_CHILDREN)
 int pmic_bind_children(struct udevice *pmic, int offset,
 		       const struct pmic_child_info *child_info)
 {
@@ -84,6 +85,7 @@ int pmic_bind_children(struct udevice *pmic, int offset,
 	debug("Bound: %d childs for PMIC: '%s'\n", bind_count, pmic->name);
 	return bind_count;
 }
+#endif
 
 int pmic_get(const char *name, struct udevice **devp)
 {

drivers/power/regulator/Kconfig

@@ -16,6 +16,15 @@ config DM_REGULATOR
 	for this purpose if PMIC I/O driver is implemented or dm_scan_fdt_node()
 	otherwise. Detailed information can be found in the header file.
 
+config SPL_DM_REGULATOR
+	bool "Enable regulators for SPL"
+	depends on DM_REGULATOR
+	---help---
+	Regulators are seldom needed in SPL. Even if they are accessed, some
+	code space can be saved by accessing the PMIC registers directly.
+	Enable this option if you need regulators in SPL and can cope with
+	the extra code size.
+
 config REGULATOR_ACT8846
 	bool "Enable driver for ACT8846 regulator"
 	depends on DM_REGULATOR && PMIC_ACT8846

drivers/power/regulator/Makefile

@@ -5,11 +5,11 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
-obj-$(CONFIG_DM_REGULATOR) += regulator-uclass.o
+obj-$(CONFIG_$(SPL_)DM_REGULATOR) += regulator-uclass.o
 obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
 obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_DM_REGULATOR_PFUZE100) += pfuze100.o
-obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o
+obj-$(CONFIG_$(SPL_)DM_REGULATOR_FIXED) += fixed.o
 obj-$(CONFIG_REGULATOR_RK808) += rk808.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o