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Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt
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Texas Instruments OMAP compatible OPP supply description | ||
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OMAP5, DRA7, and AM57 family of SoCs have Class0 AVS eFuse registers which | ||
contain data that can be used to adjust voltages programmed for some of their | ||
supplies for more efficient operation. This binding provides the information | ||
needed to read these values and use them to program the main regulator during | ||
an OPP transitions. | ||
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Also, some supplies may have an associated vbb-supply which is an Adaptive Body | ||
Bias regulator which much be transitioned in a specific sequence with regards | ||
to the vdd-supply and clk when making an OPP transition. By supplying two | ||
regulators to the device that will undergo OPP transitions we can make use | ||
of the multi regulator binding that is part of the OPP core described here [1] | ||
to describe both regulators needed by the platform. | ||
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[1] Documentation/devicetree/bindings/opp/opp.txt | ||
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Required Properties for Device Node: | ||
- vdd-supply: phandle to regulator controlling VDD supply | ||
- vbb-supply: phandle to regulator controlling Body Bias supply | ||
(Usually Adaptive Body Bias regulator) | ||
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Required Properties for opp-supply node: | ||
- compatible: Should be one of: | ||
"ti,omap-opp-supply" - basic OPP supply controlling VDD and VBB | ||
"ti,omap5-opp-supply" - OMAP5+ optimized voltages in efuse(class0)VDD | ||
along with VBB | ||
"ti,omap5-core-opp-supply" - OMAP5+ optimized voltages in efuse(class0) VDD | ||
but no VBB. | ||
- reg: Address and length of the efuse register set for the device (mandatory | ||
only for "ti,omap5-opp-supply") | ||
- ti,efuse-settings: An array of u32 tuple items providing information about | ||
optimized efuse configuration. Each item consists of the following: | ||
volt: voltage in uV - reference voltage (OPP voltage) | ||
efuse_offseet: efuse offset from reg where the optimized voltage is stored. | ||
- ti,absolute-max-voltage-uv: absolute maximum voltage for the OPP supply. | ||
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Example: | ||
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/* Device Node (CPU) */ | ||
cpus { | ||
cpu0: cpu@0 { | ||
device_type = "cpu"; | ||
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... | ||
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vdd-supply = <&vcc>; | ||
vbb-supply = <&abb_mpu>; | ||
}; | ||
}; | ||
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/* OMAP OPP Supply with Class0 registers */ | ||
opp_supply_mpu: opp_supply@4a003b20 { | ||
compatible = "ti,omap5-opp-supply"; | ||
reg = <0x4a003b20 0x8>; | ||
ti,efuse-settings = < | ||
/* uV offset */ | ||
1060000 0x0 | ||
1160000 0x4 | ||
1210000 0x8 | ||
>; | ||
ti,absolute-max-voltage-uv = <1500000>; | ||
}; |
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