218 lines
8.5 KiB
Plaintext
218 lines
8.5 KiB
Plaintext
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Qualcomm RPM Regulators
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rpm-regulator-smd is a regulator driver which supports regulators inside of
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PMICs which are controlled by the RPM processor. Communication with the RPM
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processor takes place over SMD.
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Required structure:
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- RPM regulators must be described in two levels of devices nodes. The first
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level describes the interface with the RPM. The second level describes
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properties of one regulator framework interface (of potentially many) to
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the regulator.
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[First Level Nodes]
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Required properties:
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- compatible: Must be "qcom,rpm-regulator-smd-resource"
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- qcom,resource-name: Resource name string for this regulator to be used in RPM
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transactions. Length is 4 characters max.
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- qcom,resource-id: Resource instance ID for this regulator to be used in RPM
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transactions.
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- qcom,regulator-type: Type of this regulator. Supported values are:
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0 = LDO
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1 = SMPS
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2 = VS
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3 = NCP
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Optional properties:
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- qcom,allow-atomic: Flag specifying if atomic access is allowed for this
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regulator. Supported values are:
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0 or not present = mutex locks used
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1 = spinlocks used
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- qcom,enable-time: Time in us to delay after enabling the regulator
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- qcom,hpm-min-load: Load current in uA which corresponds to the minimum load
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which requires the regulator to be in high power mode.
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[Second Level Nodes]
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Required properties:
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- compatible: Must be "qcom,rpm-regulator-smd"
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- regulator-name: A string used as a descriptive name for regulator outputs
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- qcom,set: Specifies which sets that requests made with this
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regulator interface should be sent to. Regulator
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requests sent in the active set take effect immediately.
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Requests sent in the sleep set take effect when the Apps
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processor transitions into RPM assisted power collapse.
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Supported values are:
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1 = Active set only
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2 = Sleep set only
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3 = Both active and sleep sets
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Optional properties:
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- parent-supply: phandle to the parent supply/regulator node
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- qcom,system-load: Load in uA present on regulator that is not
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captured by any consumer request
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- qcom,use-voltage-corner: Flag that signifies if regulator_set_voltage
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calls should modify the corner parameter instead
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of the voltage parameter. When used, voltages
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specified inside of the regulator framework
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represent corners that have been incremented by
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1. This value shift is necessary to work around
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limitations in the regulator framework which
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treat 0 uV as an error.
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- qcom,use-voltage-floor-corner: Flag that signifies if regulator_set_voltage
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calls should modify the floor corner parameter
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instead of the voltage parameter. When used,
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voltages specified inside of the regulator
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framework represent corners that have been
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incremented by 1. The properties
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qcom,use-voltage-corner and
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qcom,use-voltage-floor-corner are mutually
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exclusive. Only one may be specified for a
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given regulator.
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- qcom,always-send-voltage: Flag which indicates that updates to the voltage
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or voltage corner set point should always be
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sent immediately to the RPM. If this flag is
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not specified, then voltage set point updates
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are only sent if the given regulator has also
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been enabled by a Linux consumer.
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- qcom,always-send-current: Flag which indicates that updates to the load
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current should always be sent immediately to the
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RPM. If this flag is not specified, then load
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current updates are only sent if the given
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regulator has also been enabled by a Linux
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consumer.
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The following properties specify initial values for parameters to be sent to the
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RPM in regulator requests.
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- qcom,init-enable: 0 = regulator disabled
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1 = regulator enabled
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- qcom,init-voltage: Voltage in uV
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- qcom,init-current: Current in mA
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- qcom,init-ldo-mode: Operating mode to be used with LDO regulators
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Supported values are:
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0 = mode determined by current requests
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1 = force HPM (NPM)
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- qcom,init-smps-mode: Operating mode to be used with SMPS regulators
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Supported values are:
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0 = auto; hardware determines mode
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1 = mode determined by current requests
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2 = force HPM (PWM)
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- qcom,init-pin-ctrl-enable: Bit mask specifying which hardware pins should be
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used to enable the regulator, if any; supported
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bits are:
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0 = ignore all hardware enable signals
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BIT(0) = follow HW0_EN signal
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BIT(1) = follow HW1_EN signal
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BIT(2) = follow HW2_EN signal
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BIT(3) = follow HW3_EN signal
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- qcom,init-pin-ctrl-mode: Bit mask specifying which hardware pins should be
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used to force the regulator into high power
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mode, if any. Supported bits are:
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0 = ignore all hardware enable signals
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BIT(0) = follow HW0_EN signal
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BIT(1) = follow HW1_EN signal
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BIT(2) = follow HW2_EN signal
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BIT(3) = follow HW3_EN signal
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BIT(4) = follow PMIC awake state
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- qcom,init-frequency: Switching frequency divisor for SMPS regulators.
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Supported values are n = 0 to 31 where
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freq = 19.2 MHz / (n + 1).
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- qcom,init-head-room: Voltage head room in mV required for the
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regulator. This head room value should be used
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in situations where the device connected to the
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output of the regulator has low noise tolerance.
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Note that the RPM independently enforces a
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safety head room value for subregulated LDOs
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which is sufficient to account for LDO drop-out
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voltage.
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- qcom,init-quiet-mode: Specify that quiet mode is needed for an SMPS
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regulator in order to have lower output noise.
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Supported values are:
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0 = No quiet mode
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1 = Quiet mode
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2 = Super quiet mode
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- qcom,init-freq-reason: Consumer requiring specified frequency for an
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SMPS regulator. Supported values are:
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0 = None
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1 = Bluetooth
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2 = GPS
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4 = WLAN
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8 = WAN
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- qcom,init-voltage-corner: Performance corner to use in order to determine
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voltage set point. This value corresponds to
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the actual value that will be sent and is not
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incremented by 1 like the values used inside of
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the regulator framework. The meaning of corner
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values is set by the RPM. It is possible that
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different regulators on a given platform or
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similar regulators on different platforms will
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utilize different corner values. These are
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corner values supported on MSM8974 for PMIC
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PM8841 SMPS 2 (VDD_Dig); nominal voltages for
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these corners are also shown:
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0 = None (don't care)
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1 = Retention (0.5000 V)
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2 = SVS Krait (0.7250 V)
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3 = SVS SOC (0.8125 V)
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4 = Normal (0.9000 V)
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5 = Turbo (0.9875 V)
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6 = Super Turbo (1.0500 V)
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- qcom,init-disallow-bypass: Specify that bypass mode should not be used for a
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given LDO regulator. When in bypass mode, an
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LDO performs no regulation and acts as a simple
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switch. The RPM can utilize this mode for an
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LDO that is subregulated from an SMPS when it is
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possible to reduce the SMPS voltage to the
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desired LDO output level. Bypass mode may be
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disallowed if lower LDO output noise is
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required. Supported values are:
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0 = Allow RPM to utilize LDO bypass mode
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if possible
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1 = Disallow LDO bypass mode
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- qcom,init-voltage-floor-corner: Minimum performance corner to use if any
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processor in the system is awake. This property
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supports the same values as
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qcom,init-voltage-corner.
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All properties specified within the core regulator framework can also be used in
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second level nodes. These bindings can be found in:
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Documentation/devicetree/bindings/regulator/regulator.txt.
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Example:
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rpm-regulator-smpb1 {
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qcom,resource-name = "smpb";
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qcom,resource-id = <1>;
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qcom,regulator-type = <1>;
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qcom,hpm-min-load = <100000>;
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compatible = "qcom,rpm-regulator-smd-resource";
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status = "disabled";
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pm8841_s1: regulator-s1 {
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regulator-name = "8841_s1";
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qcom,set = <3>;
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regulator-min-microvolt = <900000>;
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regulator-max-microvolt = <1150000>;
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qcom,init-voltage = <1150000>;
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compatible = "qcom,rpm-regulator-smd";
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};
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pm8841_s1_ao: regulator-s1-ao {
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regulator-name = "8841_s1_ao";
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qcom,set = <1>;
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regulator-min-microvolt = <900000>;
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regulator-max-microvolt = <1150000>;
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compatible = "qcom,rpm-regulator-smd";
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};
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pm8841_s1_corner: regulator-s1-corner {
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regulator-name = "8841_s1_corner";
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qcom,set = <3>;
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regulator-min-microvolt = <1>;
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regulator-max-microvolt = <6>;
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qcom,init-voltage-corner = <3>;
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qcom,use-voltage-corner;
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compatible = "qcom,rpm-regulator-smd";
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};
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};
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