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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>
76 lines
1.3 KiB
Text
76 lines
1.3 KiB
Text
if ARCH_MX23
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config MX23
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bool
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default y
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choice
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prompt "MX23 board select"
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optional
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config TARGET_MX23_OLINUXINO
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bool "Support mx23_olinuxino"
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select BOARD_EARLY_INIT_F
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config TARGET_MX23EVK
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bool "Support mx23evk"
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select BOARD_EARLY_INIT_F
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config TARGET_XFI3
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bool "Support xfi3"
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endchoice
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config SYS_SOC
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default "mxs"
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source "board/olimex/mx23_olinuxino/Kconfig"
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source "board/freescale/mx23evk/Kconfig"
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endif
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if ARCH_MX28
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config MX28
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bool
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default y
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choice
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prompt "MX28 board select"
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optional
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config TARGET_MX28EVK
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bool "Support mx28evk"
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select BOARD_EARLY_INIT_F
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config TARGET_XEA
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bool "Support XEA"
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endchoice
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config SYS_SOC
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default "mxs"
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config SPL_MXS_PMU_MINIMAL_VDD5V_CURRENT
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bool "Force minimal current draw from VDD5V by MX28 PMU"
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default n
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help
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After setting this option, the current drawn from VDD5V
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by the PMU is reduced to zero - the DCDC_BATT is used as
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the main power source for PMU.
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config SPL_MXS_PMU_DISABLE_BATT_CHARGE
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bool "Disable Battery Charging in MX28 PMU"
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default n
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config SPL_MXS_PMU_ENABLE_4P2_LINEAR_REGULATOR
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bool "Enable the 4P2 linear regulator in MX28 PMU"
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default y
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help
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This option enables the 4P2 linear regulator (derived
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from VDD5V) - so the VDD4P2 power source is operational.
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source "board/freescale/mx28evk/Kconfig"
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source "board/liebherr/xea/Kconfig"
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endif
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