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Date: Tue, 21 Oct 2014 11:23:44 +0200
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: Chanwoo Choi <cw00.choi@...sung.com>
Cc: Ben Dooks <ben-linux@...ff.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Russell King <linux@....linux.org.uk>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Kyungmin Park <kyungmin.park@...sung.com>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Tomasz Figa <tomasz.figa@...il.com>
Subject: Re: [PATCH 2/2] ARM: dts: exynos4412-trats: Add suspend configuration
for max77686 regulators
On wto, 2014-10-21 at 17:56 +0900, Chanwoo Choi wrote:
> Hi Krzysztof,
>
> I think that the state of some regulators should be changed in suspend state.
>
> On 10/21/2014 05:25 PM, Krzysztof Kozlowski wrote:
> > Add suspend to RAM configuration for max77686 regulators. Some LDOs and
> > bucks are disabled. This reduces energy consumption during S2R,
> > approximately from 17 mA to 9 mA.
> >
> > Additionally remove old and not supported bindings:
> > - regulator-mem-off
> > - regulator-mem-idle
> > - regulator-mem-on
> > The max77686 driver does not parse them and they are not documented
> > anywere.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > ---
> > arch/arm/boot/dts/exynos4412-trats2.dts | 135 +++++++++++++++++++++++++-------
> > 1 file changed, 105 insertions(+), 30 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts
> > index dd9ac66770f7..c2fbee36021a 100644
> > --- a/arch/arm/boot/dts/exynos4412-trats2.dts
> > +++ b/arch/arm/boot/dts/exynos4412-trats2.dts
> > @@ -225,7 +225,9 @@
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo2_reg: ldo2 {
> > @@ -234,7 +236,9 @@
> > regulator-min-microvolt = <1200000>;
> > regulator-max-microvolt = <1200000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo3_reg: ldo3 {
> > @@ -243,7 +247,9 @@
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo4_reg: ldo4 {
> > @@ -252,7 +258,9 @@
> > regulator-min-microvolt = <2800000>;
> > regulator-max-microvolt = <2800000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo5_reg: ldo5 {
> > @@ -261,7 +269,9 @@
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo6_reg: ldo6 {
> > @@ -270,7 +280,9 @@
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo7_reg: ldo7 {
> > @@ -279,7 +291,9 @@
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > regulator-always-on;
> > - regulator-mem-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo8_reg: ldo8 {
> > @@ -287,7 +301,9 @@
> > regulator-name = "VMIPI_1.0V";
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo9_reg: ldo9 {
> > @@ -295,7 +311,9 @@
> > regulator-name = "CAM_ISP_MIPI_1.2V";
> > regulator-min-microvolt = <1200000>;
> > regulator-max-microvolt = <1200000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> CAM_ISP_MIPI_1.2V is used for camera, I think this regulator should turn off in suspend state
> because camear could not be used in suspend state.
LDO9 does not support off in suspend mode controlled by PWRREQ. It
supports only switching to low power mode if PWRREQ level goes low.
Thus the driver does not provide set_suspend_enable or
set_suspend_disable for LDO0. Do you want to add such function to the
max77686 driver which will explicitly disable the regulator (write 0x0
to control reg)?
> > + };
> > };
> >
> > ldo10_reg: ldo10 {
> > @@ -303,7 +321,9 @@
> > regulator-name = "VMIPI_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo11_reg: ldo11 {
> > @@ -312,7 +332,9 @@
> > regulator-min-microvolt = <1950000>;
> > regulator-max-microvolt = <1950000>;
> > regulator-always-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo12_reg: ldo12 {
> > @@ -320,7 +342,9 @@
> > regulator-name = "VUOTG_3.0V";
> > regulator-min-microvolt = <3000000>;
> > regulator-max-microvolt = <3000000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo13_reg: ldo13 {
> > @@ -328,7 +352,9 @@
> > regulator-name = "NFC_AVDD_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> NFC_AVDD_1.8V is used for NFC feature, If user of smartphone want to use NFC feature
> and then enable NFC on the setting menu, NFC_AVDD_1.8V should turn on in suspend state.
>
> But, If NFC is not used, NFC_AVDD_1.8V should turn off in suspend state.
> So, I think this regulator should be controlled by NFC device driver without 'regulator-state-mem' property.
Currently there is no API for regulator consumers for managing the
suspend state. Consumer cannot change suspend mode or suspend state for
regulator.
>
> > + };
> > };
> >
> > ldo14_reg: ldo14 {
> > @@ -337,7 +363,9 @@
> > regulator-min-microvolt = <1950000>;
> > regulator-max-microvolt = <1950000>;
> > regulator-always-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > ldo15_reg: ldo15 {
> > @@ -345,7 +373,9 @@
> > regulator-name = "VHSIC_1.0V";
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1000000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
>
> VHSIC_1.8V was used for CP (Modem), CP (Modem) have to maintain the power in suspend state.
> - off -> on
OK.
>
> > + };
> > };
> >
> > ldo16_reg: ldo16 {
> > @@ -353,7 +383,9 @@
> > regulator-name = "VHSIC_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
>
> ditto (off -> on) for CP (MODEM)
OK.
>
> > + };
> > };
> >
> > ldo17_reg: ldo17 {
> > @@ -361,7 +393,9 @@
> > regulator-name = "CAM_SENSOR_CORE_1.2V";
> > regulator-min-microvolt = <1200000>;
> > regulator-max-microvolt = <1200000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> ditto. (on -> off) because camera is not used in supend state.
LDO17 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > + };
> > };
> >
> > ldo18_reg: ldo18 {
> > @@ -369,7 +403,9 @@
> > regulator-name = "CAM_ISP_SEN_IO_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> ditto. (on -> off) because camera is not used in supend state.
LDO18 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > + };
> > };
> >
> > ldo19_reg: ldo19 {
> > @@ -377,7 +413,9 @@
> > regulator-name = "VT_CAM_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> ditto. (on -> off) because camera is not used in supend state.
LDO19 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > + };
> > };
> >
> > ldo20_reg: ldo20 {
> > @@ -385,7 +423,9 @@
> > regulator-name = "VDDQ_PRE_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo21_reg: ldo21 {
> > @@ -393,7 +433,9 @@
> > regulator-name = "VTF_2.8V";
> > regulator-min-microvolt = <2800000>;
> > regulator-max-microvolt = <2800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo22_reg: ldo22 {
> > @@ -401,6 +443,9 @@
> > regulator-name = "VMEM_VDD_2.8V";
> > regulator-min-microvolt = <2800000>;
> > regulator-max-microvolt = <2800000>;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > ldo23_reg: ldo23 {
> > @@ -408,7 +453,9 @@
> > regulator-name = "TSP_AVDD_3.3V";
> > regulator-min-microvolt = <3300000>;
> > regulator-max-microvolt = <3300000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> ditto. (on -> off) because touchscreen is not used in suspend state.
LDO23 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > + };
> > };
> >
> > ldo24_reg: ldo24 {
> > @@ -416,7 +463,9 @@
> > regulator-name = "TSP_VDD_1.8V";
> > regulator-min-microvolt = <1800000>;
> > regulator-max-microvolt = <1800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
>
> ditto. (on -> off)
LDO24 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > + };
> > };
> >
> > ldo25_reg: ldo25 {
> > @@ -424,7 +473,9 @@
> > regulator-name = "LCD_VCC_3.3V";
> > regulator-min-microvolt = <2800000>;
> > regulator-max-microvolt = <2800000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
>
> LDC_VCC_3.3V may not be used in susepnd state. I think this regulator should turn off in suspend state.
LDO25 does not support off mode controlled by PWRREQ. Same as for LDO9.
>
> > };
> >
> > ldo26_reg: ldo26 {
> > @@ -432,7 +483,9 @@
> > regulator-name = "MOTOR_VCC_3.0V";
> > regulator-min-microvolt = <3000000>;
> > regulator-max-microvolt = <3000000>;
> > - regulator-mem-idle;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
>
> If MOTOR_VCC_3.0V is used for haptic, I think this regulator should turn off in suspend state.
LDO26 does not support off mode controlled by PWRREQ. Same as for LDO9.
Thanks for feedback!
Best regards,
Krzysztof
>
> > };
> >
> > buck1_reg: buck1 {
> > @@ -442,7 +495,9 @@
> > regulator-max-microvolt = <1100000>;
> > regulator-always-on;
> > regulator-boot-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > buck2_reg: buck2 {
> > @@ -452,7 +507,9 @@
> > regulator-max-microvolt = <1500000>;
> > regulator-always-on;
> > regulator-boot-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > buck3_reg: buck3 {
> > @@ -462,7 +519,9 @@
> > regulator-max-microvolt = <1150000>;
> > regulator-always-on;
> > regulator-boot-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > buck4_reg: buck4 {
> > @@ -471,7 +530,9 @@
> > regulator-min-microvolt = <850000>;
> > regulator-max-microvolt = <1150000>;
> > regulator-boot-on;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> >
> > buck5_reg: buck5 {
> > @@ -480,6 +541,9 @@
> > regulator-min-microvolt = <1200000>;
> > regulator-max-microvolt = <1200000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > buck6_reg: buck6 {
> > @@ -488,6 +552,9 @@
> > regulator-min-microvolt = <1350000>;
> > regulator-max-microvolt = <1350000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > buck7_reg: buck7 {
> > @@ -496,6 +563,9 @@
> > regulator-min-microvolt = <2000000>;
> > regulator-max-microvolt = <2000000>;
> > regulator-always-on;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > buck8_reg: buck8 {
> > @@ -503,6 +573,9 @@
> > regulator-name = "VMEM_VDDF_3.0V";
> > regulator-min-microvolt = <2850000>;
> > regulator-max-microvolt = <2850000>;
> > + regulator-state-mem {
> > + regulator-on-in-suspend;
> > + };
> > };
> >
> > buck9_reg: buck9 {
> > @@ -510,7 +583,9 @@
> > regulator-name = "CAM_ISP_CORE_1.2V";
> > regulator-min-microvolt = <1000000>;
> > regulator-max-microvolt = <1200000>;
> > - regulator-mem-off;
> > + regulator-state-mem {
> > + regulator-off-in-suspend;
> > + };
> > };
> > };
> > };
> >
>
> Thanks,
> Chanwoo Choi
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