[RFC Patch 1/4] mfd: AXP20x: Add power supply bindings documentation

Lee Jones
2014-10-21T10:15:03Z

On Mon, 20 Oct 2014, Bruno Pr?mont wrote:

>
> ---
> Note: the OCV values seem to have some defaults build into the
> PMIC though may need adjustment if the used battery has a different
> open circuit voltage curve.
> As far as understood (these values are set in vendor driver but not
> mentioned in chip documentation) they represent charge percentage
> for some predefined voltages.
>
> If prefixing these values with "x-power," is preferred the following
> patch should becomes a dependency:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2014-June/267606.html
> and users in patch 2/4, 4/4 need adjusting.
>
>
> Documentation/devicetree/bindings/mfd/axp20x.txt | 20 +
> 1 files changed, 20 insertions(+), 0 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mfd/axp20x.txt b/Documentation/devicetree/bindings/mfd/axp20x.txt
> index cc9e01b..8ea681c 100644
> --- a/Documentation/devicetree/bindings/mfd/axp20x.txt
> +++ b/Documentation/devicetree/bindings/mfd/axp20x.txt
> @@ -28,6 +28,20 @@ Required properties:
> (range: 750-1875). Default: 1.5MHz
>
> Optional properties for DCDCs:
> +- backup: Settings for backup/RTC battery charger
> + (Voltage in ?V, current in ?A)
> + If not present, charger will be left untouched
> +- battery.ocv: OCV capacity curve points (16 data values)
> +- battery.resistance: internal battery resistance in m?
> + (defaults to 100m?)
> +- battery.capacity: Battery capacity in mAh
> + If this attribute is missing, charger will be disabled
> + unless there is a battery connected.
> +- battery.temp_sensor: Description of temperautre sensor, 3 values
> + - driver current (20?A, 40?A, 60?A or 80?A)
> + - low temperature warning level (in ?V)
> + - high temperature warning level (in ?V)
> + If missing, temperature sensor gets disabled
> - x-powers,dcdc-workmode: 1 for PWM mode, 0 for AUTO mode
> Default: AUTO mode
>
> @@ -49,6 +63,12 @@ axp209: pmic at 34 {
> ldo3in-supply = <&axp_ipsout_reg>;
> ldo5in-supply = <&axp_ipsout_reg>;
>
> + backup = <3000000 200>;
> + battery.ocv = <0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>;
> + battery.resistance = <0>;
> + battery.capacity = <2000>;
> + battery.temp_sensor = <20 1000000 4000000>;

Since when do we use '.'s in property names?

> regulators {
> x-powers,dcdc-freq = <1500>;
>

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
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