linux-kernel - Re: [PATCH v4 2/3] dt-bindings: power: supply: qcom

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Date:   Fri, 13 Apr 2018 18:08:54 +0100
From:   Craig Tatlor <ctatlor97@...il.com>
To:     Rob Herring <robh@...nel.org>
CC:     linux-arm-msm@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] dt-bindings: power: supply: qcom_bms: Add bindings



On 13 April 2018 17:35:27 BST, Rob Herring <robh@...nel.org> wrote:
>On Sat, Apr 07, 2018 at 06:57:45PM +0100, Craig Tatlor wrote:
>> Add bindings for the Qualcomm Battery Monitoring system.
>> 
>> Signed-off-by: Craig Tatlor <ctatlor97@...il.com>
>> ---
>>  .../bindings/power/supply/qcom_bms.txt        | 93
>+++++++++++++++++++
>>  1 file changed, 93 insertions(+)
>>  create mode 100644
>Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> 
>> diff --git
>a/Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>b/Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> new file mode 100644
>> index 000000000000..6296399edc09
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/qcom_bms.txt
>> @@ -0,0 +1,93 @@
>> +Qualcomm Battery Measurement System
>> +
>> +The Qualcomm Battery Measurement System is found inside of Qualcomm
>PM8941
>
>Is it Monitoring or Measurment?
>
>> +PMICs. It provides OCV and coulomb counter registers that allow the
>kernel
>> +to infer a capacity level.
>
>s/kernel/OS/
>
>OCV?
Open Circuit Voltage - should I expand this?
>
>> +
>> +Required properties:
>> +- compatible:               Should contain "qcom,pm8941-bms".
>> +- reg:                      Specifies the SPMI address and length of
>the
>> +			    controller's registers.
>> +- interrupts:               OCV threshold interrupt.
>> +- io-channels:              Should contain IIO channel specifier for
>the
>> +			    ADC channel that reports battery temperature.
>> +- io-channel-names:         Should contain "temp".
>> +- qcom,fcc-temp-legend:     An array containing the temperature, in
>degC,
>> +			    for each column of the FCC lookup table.
>
>What's FCC?
Full charge capacity - Should i also expand this? or maybe explain in header paragraph?
>
>> +- qcom,fcc-lut:             An array of FCC values in mah, one entry
>for each
>> +			    temperature defined in in qcom,fcc-temp-legend.
>> +- qcom,ocv-temp-legend:     An array containing the temperature, in
>degC,
>> +			    for each column of the OCV lookup table.
>> +- qcom,ocv-capacity-legend: An array containing the capacity for
>each
>> +			    row of the OCV lookup table.
>> +- qcom,ocv-lut:             An array of OCV values in mV, one entry
>for each
>> +			    capacity defined in qcom,ocv-capacity-legend.
>
>Need to specify the sizes of these if not 32-bit.
Right.
>
>All these seem to have units, so add unit suffixes as defined in 
>property-units.txt.
Will do.
>
>> +
>> +Example:
>> +
>> +		pm8941_vadc: vadc@...0 {
>
>adc@...
Okay.
>
>> +			compatible = "qcom,spmi-vadc";
>> +			reg = <0x3100>;
>> +			interrupts = <0x0 0x31 0x0 IRQ_TYPE_EDGE_RISING>;
>> +			#address-cells = <1>;
>> +			#size-cells = <0>;
>> +			#io-channel-cells = <1>;
>> +
>> +			bat_temp {
>> +				reg = <VADC_LR_MUX1_BAT_THERM>;
>> +			};
>> +		};
>> +
>> +		bms@...0 {
>> +			compatible = "qcom,pm8941-bms";
>> +			reg = <0x4000>;
>> +			interrupts = <0x0 0x40 0x4 IRQ_TYPE_EDGE_RISING>;
>> +			interrupt-names = "ocv_thr";
>> +
>> +			io-channels = <&pm8941_vadc VADC_LR_MUX1_BAT_THERM>;
>> +			io-channel-names = "temp";
>> +
>> +			qcom,fcc-temp-legend = /bits/ 8 <(-10) 0 25 50 65>;
>> +			qcom,fcc-lut = /bits/ 16 <6010 6070 6680 6780 6670>;
>> +
>> +			qcom,ocv-capacity-legend = /bits/ 8 <100 95 90 85
>> +							     80 75 70 65
>> +							     60 55 50 45
>> +							     40 35 30 25
>> +							     20 15 10 9
>> +							     8 7 6 5 4
>> +							     3 2 1 0>;
>> +
>> +			qcom,ocv-temp-legend = /bits/ 8 <(-10) 0 25 50 65>;
>> +			qcom,ocv-lut = /bits/ 16 <4288 4288 4306 4315 4315
>> +						  4261 4241 4259 4266 4246
>> +						  4201 4181 4201 4207 4187
>> +						  4153 4133 4150 4155 4135
>> +						  4105 4085 4100 4104 4084
>> +						  4058 4038 4052 4058 4038
>> +						  4012 3992 4004 4014 3994
>> +						  3970 3950 3959 3971 3951
>> +						  3931 3911 3915 3927 3907
>> +						  3899 3879 3880 3884 3864
>> +						  3873 3853 3851 3853 3833
>> +						  3848 3828 3827 3829 3809
>> +						  3829 3809 3808 3809 3789
>> +						  3815 3795 3791 3791 3771
>> +						  3801 3781 3775 3772 3752
>> +						  3785 3765 3751 3746 3726
>> +						  3767 3747 3727 3719 3699
>> +						  3750 3730 3702 3692 3672
>> +						  3728 3708 3680 3672 3652
>> +						  3720 3700 3676 3665 3645
>> +						  3712 3692 3670 3660 3645
>> +						  3695 3675 3658 3648 3633
>> +						  3662 3647 3629 3620 3610
>> +						  3620 3605 3589 3580 3570
>> +						  3562 3552 3538 3529 3519
>> +						  3490 3480 3474 3470 3465
>> +						  3403 3398 3388 3380 3375
>> +						  3320 3300 3255 3221 3206
>> +						  3000 3000 3000 3000 3000>;
>> +		};
>> +	};
>> +};
>> -- 
>> 2.17.0
>>