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| author | Nishanth Menon <nm@ti.com> | 2016-04-20 03:18:39 -0500 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2016-04-26 10:01:55 -0700 |
| commit | 54d03c5d8b2a8af15b25e748fa9bc6e572060125 (patch) | |
| tree | 6cb42d04d018093a577d030c6366130d4501f6c6 /arch/arm/boot/dts/dra7-evm.dts | |
| parent | 3023aa4ad8138066a69e25cf4d1b6880204e5e05 (diff) | |
| download | lwn-54d03c5d8b2a8af15b25e748fa9bc6e572060125.tar.gz lwn-54d03c5d8b2a8af15b25e748fa9bc6e572060125.zip | |
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>
Diffstat (limited to 'arch/arm/boot/dts/dra7-evm.dts')
| -rw-r--r-- | arch/arm/boot/dts/dra7-evm.dts | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/dra7-evm.dts b/arch/arm/boot/dts/dra7-evm.dts index d272cf140197..e94cbb7dd3c5 100644 --- a/arch/arm/boot/dts/dra7-evm.dts +++ b/arch/arm/boot/dts/dra7-evm.dts @@ -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; }; |