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Qualcomm Technologies, Inc. GFX LDO for Graphics
The GPU core on MSM 8953 can be powered by an internal (on-die)
MSM LDO or BHS based on its operating corner.
This document describes the bindings that apply for the GFX LDO regulator.
- compatible
Usage: required
Value type: <string>
Definition: should be "qcom,msm8953-gfx-ldo" for MSM8953 and
"qcom,sdm660-gfx-ldo" for SDM660
- reg
Usage: required
Value type: <prop-encoded-array>
Definition: Addresses and sizes for the memory of the GFX ldo
- reg-names
Usage: required
Value type: <stringlist>
Definition: Address names. "ldo_addr", "efuse_addr". Must be
specified in the same order as the corresponding addresses
are specified in the reg property.
- regulator-name
Usage: required
Value type: <string>
Definition: A string used to describe the regulator.
- regulator-min-microvolt
Usage: required
Value type: <u32>
Definition: Minimum corner value which should be 1 to represent the
lowest supported corner.
- regulator-max-microvolt
Usage: required
Value type: <u32>
Definition: Maximum corner value which should be equal to qcom,num-corners.
- qcom,num-corners
Usage: required
Value type: <u32>
Definition: Number of voltage corners present. Many other
properties are sized based upon this value.
- qcom,num-ldo-corners
Usage: required
Value type: <u32>
Definition: Number of voltage corners defined for the ldo. It is a
subset of qcom,num-corners (i.e. 1 to qcom,num-ldo-corners
are the corners for ldo operation)
- qcom,init-corner
Usage: required
Value type: <u32>
Definition: The initial-corner at which the GFX rail is powered on.
- qcom,ldo-enable-corner-map
Usage: required
Value type: <prop-encoded-array>
Definition: Integer values ( / 0) which indicate the GFX corners in which
ldo is to enabled. The length of this property
should be equal to qcom,num-corners.
- qcom,ldo-voltage-ceiling
Usage: required
Value type: <prop-encoded-array>
Definition: Array of ceiling voltages in microvolts for voltage corners
ordered from lowest voltage corner to highest voltage corner.
This property must be of length defined by qcom,num-ldo-corners.
- qcom,ldo-voltage-floor
Usage: required
Value type: <prop-encoded-array>
Definition: Array of floor voltages in microvolts for voltage corners
ordered from lowest voltage corner to highest voltage corner.
This property must be of length defined by qcom,num-ldo-corners.
- vdd-cx-supply
Usage: optional
Value type: <phandle>
Definition: Parent regulator supply to the ldo.
- qcom,vdd-cx-corner-map
Usage: required if vdd-cx-supply is specified.
Value type: <prop-encoded-array>
Definition: Array of integers which define the mapping of the VDD_CX corner
to the corresponding GFX voltage corner. The elements in
the array are ordered from lowest voltage corner to highest
voltage corner. The length of this property must be equal to
the value defined by qcom,num-corners.
- mem-acc-supply
Usage: optional
Value type: <phandle>
Definition: Regulator to vote for the memory accelerator configuration.
Not Present: memory accelerator configuration not supported.
- qcom,mem-acc-corner-map:
Usage: optional
Value type: <prop-encoded-aray>
Definition: Array of integer which defines the mapping from mem-acc
corner value for each gfx corner. The elements in the array
are ordered from lowest voltage corner to highest voltage corner.
- qcom,ldo-init-voltage-adjustment
Usage: optional
Value type: <prop-encoded-aray>
Definition: Array of voltages in microvolts which indicate the static
adjustment to be applied to the open-loop voltages for the
LDO supported corners. The length of this property must be
equal to qcom,num-ldo-corners.
=======
Example
=======
gfx_vreg_corner: ldo@0185f000 {
compatible = "qcom,msm8953-gfx-ldo";
reg = <0x0185f000 0x30>, <0xa0000 0x1000>;
reg-names = "ldo_addr", "efuse_addr";
regulator-name = "msm_gfx_ldo";
regulator-min-microvolt = <1>;
regulator-max-microvolt = <7>;
qcom,ldo-voltage-ceiling = <500000 700000 900000>;
qcom,ldo-voltage-floor = <400000 600000 800000>;
qcom,num-corners = <7>;
qcom,num-ldo-corners = <3>;
qcom,ldo-enable-corner-map = <1 1 1 0 0 0 0>;
qcom,init-corner = <5>;
vdd-cx-supply = <&pm8953_s2_level>;
qcom,vdd-cx-corner-map = <RPM_SMD_REGULATOR_LEVEL_LOW_SVS>,
<RPM_SMD_REGULATOR_LEVEL_LOW_SVS>,
<RPM_SMD_REGULATOR_LEVEL_LOW_SVS>,
<RPM_SMD_REGULATOR_LEVEL_SVS>,
<RPM_SMD_REGULATOR_LEVEL_NOM>,
<RPM_SMD_REGULATOR_LEVEL_NOM_PLUS>,
<RPM_SMD_REGULATOR_LEVEL_TURBO>;
mem-acc-supply = <&gfx_mem_acc>;
qcom,mem-acc-corner-map = <1 1 2 2 2 2 2>;
qcom,ldo-init-voltage-adjustment = <10000 20000 30000>;
};