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feat(allwinner): allow to skip PMIC regulator setup

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For somewhat historical reasons we are doing some initial PMIC regulator
setup in BL31, as U-Boot does not (yet) have a PMIC driver. This worked
fine so far, but there is at least one board (OrangePi 3) that gets upset,
because the Ethernet PHY needs some *coordinated* bringup of *two*
regulators.

To avoid custom hacks, let's introduce a build option to keep doing the
regulator setup in TF-A. Defining SUNXI_SETUP_REGULATORS to 0 will break
support for some devices on some boards in U-Boot (Ethernet and HDMI),
but will allow to bring up the OrangePi 3 in Linux correctly. We keep
the default at 1 to not change the behaviour for all other boards.

After U-Boot gained proper PMIC support at some point in the future, we
will probably change the default to 0, to get rid of the less optimal
PMIC code in TF-A.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Change-Id: Ie8e2583d0396f6eeaae8ffe6b6190f27db63e2a7
This commit is contained in:
Andre Przywara 2021-11-01 00:17:37 +00:00
parent c8076a0e69
commit 67412e4d7a
5 changed files with 17 additions and 0 deletions
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2
drivers/allwinner/axp/axp803.c
View file

@ -9,6 +9,7 @@
const uint8_t axp_chip_id = AXP803_CHIP_ID;
const char *const axp_compatible = "x-powers,axp803";
#if SUNXI_SETUP_REGULATORS == 1
const struct axp_regulator axp_regulators[] = {
{"dcdc1", 1600, 3400, 100, NA, 0x20, 0x10, 0},
{"dcdc5", 800, 1840, 10, 32, 0x24, 0x10, 4},
@ -20,3 +21,4 @@ const struct axp_regulator axp_regulators[] = {
{"fldo1", 700, 1450, 50, NA, 0x1c, 0x13, 2},
{}
};
#endif

2
drivers/allwinner/axp/axp805.c
View file

@ -9,6 +9,7 @@
const uint8_t axp_chip_id = AXP805_CHIP_ID;
const char *const axp_compatible = "x-powers,axp805";
#if SUNXI_SETUP_REGULATORS == 1
/*
* The "dcdcd" split changes the step size by a factor of 5, not 2;
* disallow values above the split to maintain accuracy.
@ -31,3 +32,4 @@ const struct axp_regulator axp_regulators[] = {
{"cldo3", 700, 3300, 100, NA, 0x26, 0x11, 6},
{}
};
#endif

2
drivers/allwinner/axp/common.c
View file

@ -48,6 +48,7 @@ void axp_power_off(void)
axp_setbits(0x32, BIT(7));
}
#if SUNXI_SETUP_REGULATORS == 1
/*
* Retrieve the voltage from a given regulator DTB node.
* Both the regulator-{min,max}-microvolt properties must be present and
@ -208,3 +209,4 @@ void axp_setup_regulators(const void *fdt)
axp_setbits(0x11, BIT(7));
}
}
#endif /* SUNXI_SETUP_REGULATORS */

7
include/drivers/allwinner/axp.h
View file

@ -47,6 +47,13 @@ int axp_clrsetbits(uint8_t reg, uint8_t clr_mask, uint8_t set_mask);
int axp_check_id(void);
void axp_power_off(void);
#if SUNXI_SETUP_REGULATORS == 1
void axp_setup_regulators(const void *fdt);
#else
static inline void axp_setup_regulators(const void *fdt)
{
}
#endif
#endif /* AXP_H */

4
plat/allwinner/common/allwinner-common.mk
View file

@ -61,6 +61,10 @@ BL31_SOURCES += drivers/allwinner/sunxi_msgbox.c \
${AW_PLAT}/common/sunxi_scpi_pm.c
endif
SUNXI_SETUP_REGULATORS ?= 1
$(eval $(call assert_boolean,SUNXI_SETUP_REGULATORS))
$(eval $(call add_define,SUNXI_SETUP_REGULATORS))
# The bootloader is guaranteed to only run on CPU 0 by the boot ROM.
COLD_BOOT_SINGLE_CPU := 1