Hi, On Wed, Sep 12, 2018 at 03:29:38PM +0800, Baolin Wang wrote: > This patch adds the binding documentation for Spreadtrum SC27XX series PMICs > fuel gauge unit device, which is used to calculate the battery capacity. > > Signed-off-by: Baolin Wang <[email protected]> > --- > .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 > ++++++++++++++++++++ > 1 file changed, 55 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > > diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > new file mode 100644 > index 0000000..7447bae > --- /dev/null > +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt > @@ -0,0 +1,55 @@ > +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings > + > +Required properties: > +- compatible: Should be one of the following: > + "sprd,sc2720-fgu", > + "sprd,sc2721-fgu", > + "sprd,sc2723-fgu", > + "sprd,sc2730-fgu", > + "sprd,sc2731-fgu". > +- reg: The address offset of fuel gauge unit. > +- bat-detect-gpio: GPIO for battery detection. > +- io-channels: Specify the IIO ADC channel to get temperature. > +- io-channel-names: Should be "bat-temp". > +- sprd,inner-resist: Specify the the battery inner resistance (mOhm).
This should be a property of the battery.without the sprd, prefix.
> +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding
> + open circuit voltage (ocv) of the battery, which is used to look up current
> + battery capacity according to current baterry ocv values.
This should also be part of the battery binding. I just reviewed a
patchset for the Qualcomm Battery Monitoring System, which needs the
same functionality. The Qualcomm binding is more advanced, but
should also support this simpler case. Thus I think it makes sense
to use its description as base for adding support for this feature
to Documentation/devicetree/bindings/power/supply/battery.txt
-- Sebastian
> +- monitored-battery: Phandle of battery characteristics devicetree node.
> + The fuel gauge uses the following battery properties:
> +- charge-full-design-microamp-hours: battery design capacity.
> +- constant-charge-voltage-max-microvolt: maximum constant input voltage.
> + See Documentation/devicetree/bindings/power/supply/battery.txt
> +
> +Example:
> +
> + bat: battery {
> + compatible = "simple-battery";
> + charge-full-design-microamp-hours = <1900000>;
> + constant-charge-voltage-max-microvolt = <4350000>;
> + ......
> + };
> +
> + sc2731_pmic: pmic@0 {
> + compatible = "sprd,sc2731";
> + reg = <0>;
> + spi-max-frequency = <26000000>;
> + interrupts = <GIC_SPI 31 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + fgu@a00 {
> + compatible = "sprd,sc2731-fgu";
> + reg = <0xa00>;
> + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>;
> + io-channels = <&pmic_adc 5>;
> + io-channel-names = "bat-temp";
> + sprd,inner-resist = <250>;
> + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>,
> <4022 85>, <3983 80>, <3949 75>, <3917 70>,
> + <3889 65>, <3864 60>, <3835 55>, <3805 50>,
> <3787 45>, <3777 40>, <3773 35>, <3770 30>,
> + <3765 25>, <3752 20>, <3724 15>, <3680 10>,
> <3605 5>, <3400 0>;
> + monitored-battery = <&bat>;
> + };
> + };
> --
> 1.7.9.5
>
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