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Commit 70e28253 authored by Fenglin Wu's avatar Fenglin Wu
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power: smb1351-charger: Add control for parallel charger configuration 



SMB1351 can be configured as the main charger in a parallel charging
solution. In the main chargers role, it is responsible for detecting the
charger adapter's input current limit(ICL) and splitting the ICL with the
slave charger. It also splits the full charging current(FCC) and helps
reduce the thermal dissipation across both the chargers.

CRs-Fixed: 991446
Change-Id: If6040cc9b49019736f267da628d95f1078a66c6f
Signed-off-by: default avatarFenglin Wu <fenglinw@codeaurora.org>
parent c3b8572a

Documentation/devicetree/bindings/power/smb1351-charger.txt

+55 −4
Original line number Diff line number Diff line
@@ -48,7 +48,6 @@ Optional Properties: 
				property should be used with 'qcom,iterm-disabled'

				to ensure EOC detection in charger is disabled.

- qcom,force-hvdcp-2p0		Boolean value which allows to force hvdcp working on 2.0 mode.

- qcom,parallel-charger		Boolean value which enables the parallel charger.

- qcom,chg-vadc			Corresponding VADC device's phandle.

- qcom,chg-adc_tm		phandle to the corresponding VADC device to read the ADC channels.

- qcom,batt-cold-decidegc	Cold battery temperature in decidegC.
@@ -67,9 +66,54 @@ Optional Properties: 
- qcom,batt-cool-mv:		Maximum cool battery target voltage in milli-volts.

- qcom,switch-freq:		Switching frequency of charger. Supported values:

				0 - 750 kHz, 1 - 1 MHz, 2 - 1.5 MHz, 3 - 3 MHz.

- qcom,parallel-en-pin-polarity Specify the polarity of enable signal controlled

				via pin in a parallel-charger configuration.

				0 - Active low and 1  - Active high.

- qcom,parallel-usb-min-current-ma:

				Minimum current which has to be drawn from USB when

				acting as the primary charger before enabling the

				parallel slave.

				This property needs to be specified if it's acting as

				the primary charger in parallel charger configuration.

- qcom,parallel-usb-9v-min-current-ma:

				Minimum current which has to be drawn from USB when

				acting as the primary charger before enabling the

				parallel slave. This value applies only for 9V charger

				adapters.

				This property needs to be specified if it's acting as

				the primary charger in parallel charger configuration.

- qcom,parallel-usb-12v-min-current-ma:

				Minimum current which has to be drawn from USB when

				acting as the primary charger before enabling the

				parallel slave. This value applies only for 12V charger

				adapters.

				This property needs to be specified if it's acting as

				the primary charger in parallel charger configuration.

- qcom,parallel-allowed-lowering-ma:

				The acceptable current drop from the initial limit(ICL)

				to keep parallel charging active. If charging current

				drops below this threshold, parallel charging is

				disabled.

				This property needs to be specified if it's acting as

				the primary charger in parallel charger configuration.

- qcom,parallel-main-chg-fcc-percent:

				Percentage of the fast charge current allotted to the

				primary charger when parallel charging is enabled and

				operational.

				If this property is not defined, the driver defaults

				to a 50% : 50% split between the primary charger and the

				slave charger.

- qcom,parallel-main-chg-icl-percent:

				Percentage of the input current allotted to the primary

				charger when parallel charging is enabled and

				operational.

				If this property is not defined, the driver defaults to

				a 50% : 50% split between the primary charger and the

				slave charger.

- qcom,parallel-charger:	Boolean value to indicate if it's a slave charger in

				parallel charger configuration.

- qcom,parallel-en-pin-polarity:

				Specify the active polarity of enable pin of the slave

				charger in parallel charger configuration:

					0 - Active low

					1 - Active high.

				If not specified the default value is active-low.



Example for standalone charger:
@@ -99,6 +143,13 @@ Example for standalone charger: 
		qcom,batt-cool-ma = <350>;

		qcom,batt-warm-mv = <4200>;

		qcom,batt-cool-mv = <4200>;

		qcom,parallel-usb-min-current-ma = <1300>;

		qcom,parallel-usb-9v-min-current-ma = <900>;

		qcom,parallel-usb-12v-min-current-ma = <900>;

		qcom,parallel-allowed-lowering-ma = <500>;

		qcom,parallel-main-chg-fcc-percent = <50>;

		qcom,parallel-main-chg-icl-percent = <50>;



	};

};

drivers/power/smb1351-charger.c

+1153 −264

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