This option sets the current limit for 5V source to zero, so all the PMU outputs are primarily powered from battery source (DCDC_BAT).
This option may be set on systems, where the 5V is NOT supposed to be in any scenario powering the system - for example on systems where DCDC_BAT is connected to fixed and regulated 4.2V source (so the "battery" is not present).
Signed-off-by: Lukasz Majewski lukma@denx.de --- arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 4 ++++ arch/arm/mach-imx/mxs/Kconfig | 8 ++++++++ 2 files changed, 12 insertions(+)
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c index c33170f06d..9965810ac2 100644 --- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c +++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c @@ -752,6 +752,10 @@ static void mxs_batt_boot(void) POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK, 0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
+ if (CONFIG_IS_ENABLED(MXS_PMU_MINIMAL_VDD5V_CURRENT)) + setbits_le32(&power_regs->hw_power_5vctrl, + POWER_5VCTRL_ILIMIT_EQ_ZERO); + mxs_power_enable_4p2(); }
diff --git a/arch/arm/mach-imx/mxs/Kconfig b/arch/arm/mach-imx/mxs/Kconfig index b2026a3758..3232b0fb67 100644 --- a/arch/arm/mach-imx/mxs/Kconfig +++ b/arch/arm/mach-imx/mxs/Kconfig @@ -51,6 +51,14 @@ endchoice config SYS_SOC default "mxs"
+config SPL_MXS_PMU_MINIMAL_VDD5V_CURRENT + bool "Force minimal current draw from VDD5V by MX28 PMU" + default n + help + After setting this option, the current drawn from VDD5V + by the PMU is reduced to zero - the DCDC_BATT is used as + the main power source for PMU. + source "board/freescale/mx28evk/Kconfig" source "board/liebherr/xea/Kconfig"