[PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Lukasz Majewski]

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"
 
-- 
2.30.2

[PATCH 2/5] arm: mxs: Provide Kconfig option to disable battery charging at IMX28 PMU

[Lukasz Majewski]

This new Kconfig option allows disabling the in-PMU battery charging
block. This may be required when DCDC_BAT source is powered not from
battery, but from already regulated, good quality source.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
 arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 7 +++++++
 arch/arm/mach-imx/mxs/Kconfig               | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
index 9965810ac2..7c584db27c 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
@@ -756,6 +756,13 @@ static void mxs_batt_boot(void)
 		setbits_le32(&power_regs->hw_power_5vctrl,
 			     POWER_5VCTRL_ILIMIT_EQ_ZERO);
 
+	if (CONFIG_IS_ENABLED(MXS_PMU_DISABLE_BATT_CHARGE)) {
+		writel(POWER_CHARGE_PWD_BATTCHRG,
+		       &power_regs->hw_power_charge_set);
+		writel(POWER_5VCTRL_PWD_CHARGE_4P2_MASK,
+		       &power_regs->hw_power_5vctrl_set);
+	}
+
 	mxs_power_enable_4p2();
 }
 
diff --git a/arch/arm/mach-imx/mxs/Kconfig b/arch/arm/mach-imx/mxs/Kconfig
index 3232b0fb67..f5e45ae846 100644
--- a/arch/arm/mach-imx/mxs/Kconfig
+++ b/arch/arm/mach-imx/mxs/Kconfig
@@ -59,6 +59,10 @@ config SPL_MXS_PMU_MINIMAL_VDD5V_CURRENT
 	  by the PMU is reduced to zero - the DCDC_BATT is used as
 	  the main power source for PMU.
 
+config SPL_MXS_PMU_DISABLE_BATT_CHARGE
+	bool "Disable Battery Charging in MX28 PMU"
+	default n
+
 source "board/freescale/mx28evk/Kconfig"
 source "board/liebherr/xea/Kconfig"
 
-- 
2.30.2

[PATCH 3/5] arm: mxs: Provide Kconfig option to not enable 4P2 regulator in IMX28 PMU

[Lukasz Majewski]

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>
---
 arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 3 ++-
 arch/arm/mach-imx/mxs/Kconfig               | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

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"
 
-- 
2.30.2

[PATCH 4/5] arm: mxs: Add function to dump PMU registers

[Lukasz Majewski]

This commit provides function, which when debugging
output is enabled dumps the IMX28 PMU registers.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
 arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 24 +++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
index 24f61b4b56..7ea029e371 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
@@ -41,6 +41,29 @@ static void mxs_power_clock2xtal(void)
 		&clkctrl_regs->hw_clkctrl_clkseq_set);
 }
 
+static void mxs_power_regs_dump(void)
+{
+	struct mxs_power_regs *power_regs =
+		(struct mxs_power_regs *)MXS_POWER_BASE;
+
+	debug("ctrl:\t\t 0x%x\n", readl(&power_regs->hw_power_ctrl));
+	debug("5vctrl:\t\t 0x%x\n", readl(&power_regs->hw_power_5vctrl));
+	debug("minpwr:\t\t 0x%x\n", readl(&power_regs->hw_power_minpwr));
+	debug("charge:\t\t 0x%x\n", readl(&power_regs->hw_power_charge));
+	debug("vddctrl:\t 0x%x\n", readl(&power_regs->hw_power_vdddctrl));
+	debug("vddactrl:\t 0x%x\n", readl(&power_regs->hw_power_vddactrl));
+	debug("vddioctrl:\t 0x%x\n", readl(&power_regs->hw_power_vddioctrl));
+	debug("vddmemctrl:\t 0x%x\n", readl(&power_regs->hw_power_vddmemctrl));
+	debug("dcdc4p2:\t 0x%x\n", readl(&power_regs->hw_power_dcdc4p2));
+	debug("misc:\t\t 0x%x\n", readl(&power_regs->hw_power_misc));
+	debug("dclimits:\t 0x%x\n", readl(&power_regs->hw_power_dclimits));
+	debug("loopctrl:\t 0x%x\n", readl(&power_regs->hw_power_loopctrl));
+	debug("sts:\t\t 0x%x\n", readl(&power_regs->hw_power_sts));
+	debug("speed:\t\t 0x%x\n", readl(&power_regs->hw_power_speed));
+	debug("battmonitor:\t 0x%x\n",
+	      readl(&power_regs->hw_power_battmonitor));
+}
+
 /**
  * mxs_power_clock2pll() - Switch CPU core clock source to PLL
  *
@@ -1280,6 +1303,7 @@ void mxs_power_init(void)
 		POWER_CTRL_DCDC4P2_BO_IRQ, &power_regs->hw_power_ctrl_clr);
 
 	writel(POWER_5VCTRL_PWDN_5VBRNOUT, &power_regs->hw_power_5vctrl_set);
+	mxs_power_regs_dump();
 
 	early_delay(1000);
 }
-- 
2.30.2

[PATCH 5/5] arm: config: Adjust imx287 based XEA board PMU configuration

[Lukasz Majewski]

This patch adjusts XEA's PMU setup as this board is supposed to be
mainly powered from DCDC_BATT source.

Moreover, in this HW design the VDD_4P2 is not used as well.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
---
 configs/imx28_xea_defconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig
index 579545f4ed..3d92a06999 100644
--- a/configs/imx28_xea_defconfig
+++ b/configs/imx28_xea_defconfig
@@ -13,6 +13,9 @@ CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="imx28-xea"
 CONFIG_SPL_TEXT_BASE=0x1000
 CONFIG_TARGET_XEA=y
+CONFIG_SPL_MXS_PMU_MINIMAL_VDD5V_CURRENT=y
+CONFIG_SPL_MXS_PMU_DISABLE_BATT_CHARGE=y
+# CONFIG_SPL_MXS_PMU_ENABLE_4P2_LINEAR_REGULATOR is not set
 CONFIG_SPL_MMC=y
 CONFIG_SPL_SERIAL=y
 CONFIG_SPL_STACK=0x20000
-- 
2.30.2

Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Marek Vasut]

On 5/9/23 16:32, Lukasz Majewski wrote:
> 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).

Is it possible to dig this information out of DT or is the DT not 
available in SPL for this platform ?

Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Lukasz Majewski]

[-- Attachment #1: Type: text/plain, Size: 1070 bytes --]

Hi Marek,

> On 5/9/23 16:32, Lukasz Majewski wrote:
> > 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).  
> 
> Is it possible to dig this information out of DT or is the DT not 
> available in SPL for this platform ?

This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40 KiB.

I would prefer to keep this as Kconfig as the PMU driver is not
supporting DT and in fact now ARCH_MX28 only has two boards supported -
XEA and imx28evk.


Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Marek Vasut]

On 5/9/23 16:46, Lukasz Majewski wrote:
> Hi Marek,

Hi,

>> On 5/9/23 16:32, Lukasz Majewski wrote:
>>> 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).
>>
>> Is it possible to dig this information out of DT or is the DT not
>> available in SPL for this platform ?
> 
> This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40 KiB.
> 
> I would prefer to keep this as Kconfig as the PMU driver is not
> supporting DT and in fact now ARCH_MX28 only has two boards supported -
> XEA and imx28evk.

Why not use the platdata then ?
This makes it far better, as the code is actually always compiled and 
doesn't start to bitrot.

Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Lukasz Majewski]

[-- Attachment #1: Type: text/plain, Size: 1597 bytes --]

Hi Marek,

> On 5/9/23 16:46, Lukasz Majewski wrote:
> > Hi Marek,  
> 
> Hi,
> 
> >> On 5/9/23 16:32, Lukasz Majewski wrote:  
> >>> 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).  
> >>
> >> Is it possible to dig this information out of DT or is the DT not
> >> available in SPL for this platform ?  
> > 
> > This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40
> > KiB.
> > 
> > I would prefer to keep this as Kconfig as the PMU driver is not
> > supporting DT and in fact now ARCH_MX28 only has two boards
> > supported - XEA and imx28evk.  
> 
> Why not use the platdata then ?
> This makes it far better, as the code is actually always compiled and 
> doesn't start to bitrot.

As fair as I can tell - the MX28 PMU driver in SPL is not supporting
OF_PLATDATA. Or have I overlooked something?

I would like to investigate the PMU issue, and avoid extra work to
provide platdata support for two supported imx287 based boards.

Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Marek Vasut]

On 5/9/23 17:04, Lukasz Majewski wrote:
> Hi Marek,
> 
>> On 5/9/23 16:46, Lukasz Majewski wrote:
>>> Hi Marek,
>>
>> Hi,
>>
>>>> On 5/9/23 16:32, Lukasz Majewski wrote:
>>>>> 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).
>>>>
>>>> Is it possible to dig this information out of DT or is the DT not
>>>> available in SPL for this platform ?
>>>
>>> This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40
>>> KiB.
>>>
>>> I would prefer to keep this as Kconfig as the PMU driver is not
>>> supporting DT and in fact now ARCH_MX28 only has two boards
>>> supported - XEA and imx28evk.
>>
>> Why not use the platdata then ?
>> This makes it far better, as the code is actually always compiled and
>> doesn't start to bitrot.
> 
> As fair as I can tell - the MX28 PMU driver in SPL is not supporting
> OF_PLATDATA. Or have I overlooked something?
> 
> I would like to investigate the PMU issue, and avoid extra work to
> provide platdata support for two supported imx287 based boards.

Hum, considering that this platform is basically legacy and winding 
down, I guess that's OK too.

Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Fabio Estevam]

Hi Lukasz,

The series looks good. Only a minor comment:

On Tue, May 9, 2023 at 11:33 AM Lukasz Majewski <lukma@denx.de> wrote:

> +config SPL_MXS_PMU_MINIMAL_VDD5V_CURRENT
> +       bool "Force minimal current draw from VDD5V by MX28 PMU"
> +       default n

Please drop "default n" as it is already the default.

The same applies to patch 2/5.

Thanks

Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Lukasz Majewski]

[-- Attachment #1: Type: text/plain, Size: 2067 bytes --]

Hi Marek,

> On 5/9/23 17:04, Lukasz Majewski wrote:
> > Hi Marek,
> >   
> >> On 5/9/23 16:46, Lukasz Majewski wrote:  
> >>> Hi Marek,  
> >>
> >> Hi,
> >>  
> >>>> On 5/9/23 16:32, Lukasz Majewski wrote:  
> >>>>> 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).  
> >>>>
> >>>> Is it possible to dig this information out of DT or is the DT not
> >>>> available in SPL for this platform ?  
> >>>
> >>> This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40
> >>> KiB.
> >>>
> >>> I would prefer to keep this as Kconfig as the PMU driver is not
> >>> supporting DT and in fact now ARCH_MX28 only has two boards
> >>> supported - XEA and imx28evk.  
> >>
> >> Why not use the platdata then ?
> >> This makes it far better, as the code is actually always compiled
> >> and doesn't start to bitrot.  
> > 
> > As fair as I can tell - the MX28 PMU driver in SPL is not supporting
> > OF_PLATDATA. Or have I overlooked something?
> > 
> > I would like to investigate the PMU issue, and avoid extra work to
> > provide platdata support for two supported imx287 based boards.  
> 
> Hum, considering that this platform is basically legacy and winding 
> down, I guess that's OK too.

Are there any other issues to be solved? Or is this patch set eligible
for pulling?

(Especially that NXP has confirmed that approach used in this patch set
is in sync with their idea of PMU usage).

Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de

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Re: [PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[Marek Vasut]

On 5/19/23 10:41, Lukasz Majewski wrote:

Hello Lukasz,

>>>>>> On 5/9/23 16:32, Lukasz Majewski wrote:
>>>>>>> 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).
>>>>>>
>>>>>> Is it possible to dig this information out of DT or is the DT not
>>>>>> available in SPL for this platform ?
>>>>>
>>>>> This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40
>>>>> KiB.
>>>>>
>>>>> I would prefer to keep this as Kconfig as the PMU driver is not
>>>>> supporting DT and in fact now ARCH_MX28 only has two boards
>>>>> supported - XEA and imx28evk.
>>>>
>>>> Why not use the platdata then ?
>>>> This makes it far better, as the code is actually always compiled
>>>> and doesn't start to bitrot.
>>>
>>> As fair as I can tell - the MX28 PMU driver in SPL is not supporting
>>> OF_PLATDATA. Or have I overlooked something?
>>>
>>> I would like to investigate the PMU issue, and avoid extra work to
>>> provide platdata support for two supported imx287 based boards.
>>
>> Hum, considering that this platform is basically legacy and winding
>> down, I guess that's OK too.
> 
> Are there any other issues to be solved? Or is this patch set eligible
> for pulling?
> 
> (Especially that NXP has confirmed that approach used in this patch set
> is in sync with their idea of PMU usage).

I think this is just waiting for Stefano to pick and do a MR

[PATCH 2/5] arm: mxs: Provide Kconfig option to disable battery charging at IMX28 PMU

[sbabic]

> This new Kconfig option allows disabling the in-PMU battery charging
> block. This may be required when DCDC_BAT source is powered not from
> battery, but from already regulated, good quality source.
> Signed-off-by: Lukasz Majewski <lukma@denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de
=====================================================================

[PATCH 3/5] arm: mxs: Provide Kconfig option to not enable 4P2 regulator in IMX28 PMU

[sbabic]

> 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>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de
=====================================================================

[PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

[sbabic]

> 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>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de
=====================================================================

[PATCH 5/5] arm: config: Adjust imx287 based XEA board PMU configuration

[sbabic]

> This patch adjusts XEA's PMU setup as this board is supposed to be
> mainly powered from DCDC_BATT source.
> Moreover, in this HW design the VDD_4P2 is not used as well.
> Signed-off-by: Lukasz Majewski <lukma@denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de
=====================================================================

[PATCH 4/5] arm: mxs: Add function to dump PMU registers

[sbabic]

> This commit provides function, which when debugging
> output is enabled dumps the IMX28 PMU registers.
> Signed-off-by: Lukasz Majewski <lukma@denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic@denx.de
=====================================================================