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ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet 

As per the data sheet starting from SPRUHQ0H (Nov 2015 - Latest[1]),
VDD_CORE can vary from 0.85v to 1.15v for AVS class0. VDD GPU/DSP
et.al. can range from 0.85v to 1.25V with AVS class0

Since dynamic voltage scaling is disabled for DRA7/AM57xx SoCs for
all SoC rails other than MPU, the bootloader is responsible for
setting up the AVS class0 voltage, however, with wrong voltage machine
constraints in dtb, regulator framework will lower the voltage below
the required voltage levels for certain samples in production flow.
This can cause catastrophic failures which can be pretty hard to
identify.

Update board files which don't match required specification.

[1] http://www.ti.com/product/AM5728/datasheet/specifications#SPRT637-7340

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Nishanth Menon 2016-04-20 03:18:39 -05:00 committed by Tony Lindgren
parent 3023aa4ad8
commit 54d03c5d8b
3 changed files with 5 additions and 5 deletions
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4
arch/arm/boot/dts/am57xx-beagle-x15.dts
View File

@ -438,7 +438,7 @@
/* VDD_DSPEVE, VDD_IVA, VDD_GPU */
regulator-name = "smps45";
regulator-min-microvolt = < 850000>;
regulator-max-microvolt = <1150000>;
regulator-max-microvolt = <1250000>;
regulator-always-on;
regulator-boot-on;
};
@ -447,7 +447,7 @@
/* VDD_CORE */
regulator-name = "smps6";
regulator-min-microvolt = <850000>;
regulator-max-microvolt = <1030000>;
regulator-max-microvolt = <1150000>;
regulator-always-on;
regulator-boot-on;
};

4
arch/arm/boot/dts/dra7-evm.dts
View File

@ -431,7 +431,7 @@
/* VDD_DSPEVE */
regulator-name = "smps45";
regulator-min-microvolt = < 850000>;
regulator-max-microvolt = <1150000>;
regulator-max-microvolt = <1250000>;
regulator-always-on;
regulator-boot-on;
};
@ -449,7 +449,7 @@
/* CORE_VDD */
regulator-name = "smps7";
regulator-min-microvolt = <850000>;
regulator-max-microvolt = <1060000>;
regulator-max-microvolt = <1150000>;
regulator-always-on;
regulator-boot-on;
};

2
arch/arm/boot/dts/dra72-evm-common.dtsi
View File

@ -328,7 +328,7 @@
/* VDD_CORE */
regulator-name = "smps2";
regulator-min-microvolt = <850000>;
regulator-max-microvolt = <1060000>;
regulator-max-microvolt = <1150000>;
regulator-boot-on;
regulator-always-on;
};