diff options
| author | Lukasz Majewski <lukma@denx.de> | 2023-05-09 16:32:41 +0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2023-07-11 14:40:03 +0200 |
| commit | 79230640cb4fb780e2be9bb9a47b31976b18cac4 (patch) | |
| tree | 43b40a1c1f82ba6fb3e2a409078e7466d9615225 | |
| parent | 249a3cc1afa2bc84788addac46657ca26bb555ac (diff) | |
arm: mxs: Provide Kconfig option to not enable 4P2 regulator in IMX28 PMU
The IMX28 PMU (Power Management Unit) has a dedicated Linear Regulator
to produce (by default) 4.2V output - available outside the chip as
VDD_4P2.
When system is supposed to not use VDD5V as a main power source - instead
the DCDC_BATT is used; it is safe to disable this regulator.
As the in-PMU DCDC switching regulator (from which DCDC_VDDA, DCDC_VDDIO
and DCDC_VDDD are generated) can be driven from DCDC_BATT or output
of this 4P2 regulator - by disabling the latter the use of the DCDC_BATT
is forced.
To be more specific - according to NXP's AN4199 the DCDC_BATT source is
preferred (over VDD5V), as more efficient and stable source for
industrial applications.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 3 | ||||
| -rw-r--r-- | arch/arm/mach-imx/mxs/Kconfig | 7 |
2 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c index 7c584db27c..24f61b4b56 100644 --- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c +++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c @@ -763,7 +763,8 @@ static void mxs_batt_boot(void) &power_regs->hw_power_5vctrl_set); } - mxs_power_enable_4p2(); + if (CONFIG_IS_ENABLED(MXS_PMU_ENABLE_4P2_LINEAR_REGULATOR)) + mxs_power_enable_4p2(); } /** diff --git a/arch/arm/mach-imx/mxs/Kconfig b/arch/arm/mach-imx/mxs/Kconfig index f5e45ae846..5cffc26103 100644 --- a/arch/arm/mach-imx/mxs/Kconfig +++ b/arch/arm/mach-imx/mxs/Kconfig @@ -63,6 +63,13 @@ config SPL_MXS_PMU_DISABLE_BATT_CHARGE bool "Disable Battery Charging in MX28 PMU" default n +config SPL_MXS_PMU_ENABLE_4P2_LINEAR_REGULATOR + bool "Enable the 4P2 linear regulator in MX28 PMU" + default y + help + This option enables the 4P2 linear regulator (derived + from VDD5V) - so the VDD4P2 power source is operational. + source "board/freescale/mx28evk/Kconfig" source "board/liebherr/xea/Kconfig" |