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

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Message-ID: <20180413163527.ludqnnc5nkj4spre@rob-hp-laptop>
Date:   Fri, 13 Apr 2018 11:35:27 -0500
From:   Rob Herring <robh@...nel.org>
To:     Craig Tatlor <ctatlor97@...il.com>
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 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?

> +
> +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?

> +- 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.

All these seem to have units, so add unit suffixes as defined in 
property-units.txt.

> +
> +Example:
> +
> +		pm8941_vadc: vadc@...0 {

adc@...

> +			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
>