Rockchip OPP bindings to describe OPP nodes
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The bindings are based on top of the operating-points-v2 bindings
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described in Documentation/devicetree/bindings/opp/opp.txt
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Additional properties are described below.
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Optional properties:
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In 'operating-points-v2' table:
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- rockchip,supported-hw: The property allows to set supported hardware version.
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- rockchip,opp-shared-dsu: Indicates the dsu also uses the opp table.
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- rockchip,leakage-voltage-sel: The property is an array of 3-tuples items, and
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each item consists of leakage and voltage selector like
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<min-leakage max-leakage volt-selector>.
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min-leakage: minimum leakage in mA, ranges from 1 to 254.
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max-leakage: maximum leakage in mA, ranges from 1 to 254.
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voltage-selector: a sequence number which is used to math
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opp-microvolt-L<number> property in OPP node.
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- rockchip,leakage-scaling-sel: Similar to 'rockchip,leakage-voltage-sel', this
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allows to change max frequency according to leakage.
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- rockchip,pvtm-hw: Similar to 'opp-supported-hw', but only one hierarchical
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level, if hardware version is set in the property, the
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'rockchip,pvtm-voltage-sel-hw' will be used, otherwise
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'rockchip,pvtm-voltage-sel' will be used.
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- rockchip,pvtm-voltage-sel-hw: Similar to 'rockchip,pvtm-voltage-sel', this
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depends on 'rockchip,pvtm-hw' property.
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- rockchip,pvtm-voltage-sel: The property is an array of 3-tuples items, and
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each item consists of pvtm and voltage selector like
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<min-pvtm max-pvtm volt-selector>.
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min-pvtm: minimum frequency count in KHz.
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max-pvtm: maximum frequency count in KHz.
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voltage-selector: a sequence number which is used to math
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opp-microvolt-L<number> property in OPP node.
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- rockchip,pvtm-voltage-sel-B<number>: Similar to 'rockchip,pvtm-voltage-sel', this
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depends on 'rockchip,pvtm-hw' property. If contain
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'rockchip,pvtm-voltage-sel-hw', the property is unused.
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- rockchip,pvtm-scaling-sel: Similar to 'rockchip,pvtm-voltage-sel', this allows
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to change maximum frequency according to pvtm.
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- rockchip,bin-voltage-sel: The property is an array of 2-tuples items, and
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each item consists of bin and voltage selector like
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<min-bin volt-selector>.
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min-bin: chip version.
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voltage-selector: a sequence number which is used to math
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opp-microvolt-L<number> property in OPP node.
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- rockchip,bin-scaling-sel: Similar to 'rockchip,bin-voltage-sel', this allows
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to change maximum frequency according to chip version.
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- rockchip,grf: The phandle of the syscon node for GRF register.
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- rockchip,dsu-grf: the phandle of the syscon node for DSU GRF register.
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- rockchip,opp-clocks: List of clocks for accessing pvtpll and read margin.
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- volt-mem-read-margin: The property is an array of 2-tuples items, and
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each item consists voltage an memory read margin like
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<voltage_uV rm>, this allows to change read margin
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according to voltage.
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- low-volt-mem-read-margin: The memory read margin value of low voltage.
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- intermediate-threshold-freq: Clock frequency in KHz, if current frequency or
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target frequency less than the threshold frequency,
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there may be no need to set intermediate rate.
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- rockchip,pvtpll-table: The property is an array of 5-tuples items, and
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each item consists frequency and pvtpll config like
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<freq_khz ring length low_temp_ring low_temp_length>,
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this allows to change pvtpll config through sip smc interface.
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- rockchip,pvtpll-table-B<number>: Similar to 'rockchip,pvtpll-table'.
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- rockchip,pvtpll-avg-offset: The offset of average value register.
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- rockchip,pvtpll-min-rate: Clock frequency in KHz, if opp frequency is higher
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than the minimum frequency, the opp voltage will be
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changed.
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- rockchip,pvtpll-volt-step: Voltage step in uV.
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- rockchip,pvtm-pvtpll: Indicates pvtm value is from pvtpll.
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- rockchip,pvtm-offset: The offset of pvtm value register.
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- rockchip,pvtm-freq: Clock frequency in KHz, which is used to set the cpu clock
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frequency before get frequency count of pvtm.
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- rockchip,pvtm-volt: Voltage in uV, which is used to set the cpu voltage before
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get frequency count of pvtm.
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- rockchip,pvtm-ch: An array of two integers containing pvtm channel and clock
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oscillation ring.
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- rockchip,pvtm-sample-time: The number of milliseconds to wait for pvtm to
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finish counting.
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- rockchip,pvtm-number: An integer indicating the number of sampling points.
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- rockchip,pvtm-error: An integer indicating the error between the sample
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results.
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- rockchip,pvtm-ref-temp: The SoC internal temperature in degree centigrade, the
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min-pvtm and max-pvtm in 'leakage-voltage-sel' are
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measured at reference temperature.
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- rockchip,pvtm-temp-prop: An array of two integers containing proportional
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constants which is used to convert the value at current
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temperature to reference temperature. The first one is
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used when current temperature is below reference
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temperature. Conversely, The second one is used when
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current temperature is above reference temperature.
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- rockchip,pvtm-thermal-zone: A thermal zone node containing thermal sensor,
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it's used to get the current temperature.
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- rockchip,thermal-zone: A thermal zone node containing thermal sensor,
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it's used to get the current temperature.
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- nvmem-cells: A phandle to soc info provided by a nvmem device.
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- nvmem-cell-names: Should be "leakage", "pvtm", "mbist-vmin", "opp-info",
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"specification_serial_number", "performance", or
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"remark_spec_serial_number".
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- rockchip,threshold-freq: Clock frequency in KHz, it's used to reduce power
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for SoCs with two clusters.
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- rockchip,freq-limit: Only one cluster can contain the property, and the
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cluster's maximum frequency will be limited to its
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threshold frequency, if the other cluster's frequency
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is geater than or equal to its threshold frequency.
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- rockchip,init-freq: The initial clock frequency in KHz.
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- rockchip,max-volt: The maximum voltage of opp.
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- rockchip,evb-irdrop: The evb irdrop in uV.
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- rockchip,board-irdrop: The property is an array of 3-tuples items, and
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each item consists of frequency and voltage like
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<min-freq max-freq volt>. This allows to change voltage
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for different frequencice.
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- rockchip,temp-hysteresis: Temperature hysteresis in millicelsius.
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- rockchip,low-temp: Threshold temperature in millicelsius.
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- rockchip,low-temp-adjust-volt: The property is an array of 3-tuples items, and
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each item consists of frequency and voltage like
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<min-freq max-freq volt>. This allows to change voltage
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according to different frequencice at low temperature.
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- rockchip,low-temp-min-volt: The minimum voltage of regulator at low temperature.
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- rockchip,high-temp: Threshold temperature in millicelsius.
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- rockchip,high-temp-max-volt: The maximum voltage of regulator at high temperature.
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- rockchip,high-temp-max-freq: The maximum frequency of clock at high temperature.
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- rockchip,temp-freq-table: The property is an array of 2-tuples items, and each
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item consists of temperature and frequency like
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<min-temp max-freq>. This allows to change the max
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frequency according to temperature.
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- rockchip,high-temp-limit-table: Similar to 'rockchip,temp-freq-table', but
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it's discarded.
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- rockchip,early-min-microvolt: Voltage in uV, this allows to limit the minimum
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voltage of regulator when start up.
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- rockchip,video-4k-freq: Clock frequency in KHz, change to the frequency when
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enter SYS_STATUS_VIDEO_4K status.
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- rockchip,reboot-freq: Clock frequency in KHz, change to the frequency when
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reboot.
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- rockchip,avs-enable: Similar to 'rockchip,avs', but it's discarded.
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- rockchip,avs: Indicates avs is enabled.
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- rockchip,avs-scale: The minimum scale of avs.
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- clocks: PLL clock, it's used to get avs frequency and avs scale.
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- mbist-vmin: The minimum voltage of memory, this allows to adjust opp voltage
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according to mbist in otp.
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Examples:
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cpus {
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cpu@0 {
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operating-points-v2 = <&cluster0_opp>;
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};
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}
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cluster0_opp: opp_table0 {
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compatible = "operating-points-v2";
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opp-shared;
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rockchip,leakage-voltage-sel = <
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1 24 0
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25 254 1
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>;
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nvmem-cells = <&cpu_leakage>;
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nvmem-cell-names = "leakage";
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opp@216000000 {
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opp-hz = /bits/ 64 <216000000>;
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opp-microvolt = <950000 950000 1350000>;
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opp-microvolt-L0 = <1050000 1050000 1350000>;
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opp-microvolt-L1 = <950000 950000 1350000>;
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opp-suspend;
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}
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};
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