[PATCH v9 2/5] mfd: AXP20x: Add bindings documentation
Chen-Yu Tsai
wens at csie.org
Mon Feb 9 23:34:45 PST 2015
On Mon, Feb 2, 2015 at 4:53 PM, Lee Jones <lee.jones at linaro.org> wrote:
> On Sat, 31 Jan 2015, Chen-Yu Tsai wrote:
>
>> Hi Lee,
>>
>> On Thu, Jan 22, 2015 at 5:02 PM, Lee Jones <lee.jones at linaro.org> wrote:
>> > On Thu, 22 Jan 2015, Chen-Yu Tsai wrote:
>> >
>> >> From: Carlo Caione <carlo at caione.org>
>> >>
>> >> Bindings documentation for the AXP20x driver. In this file also
>> >> sub-nodes are documented.
>> >>
>> >> Signed-off-by: Carlo Caione <carlo at caione.org>
>> >> Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>
>> >> [wens at csie.org: clarify interrupt source for the axp PMIC]
>> >> [wens at csie.org: explain dcdc-workmode in detail and trim lines to 80 chars]
>> >> [wens at csie.org: make regulator supplies optional if using unregulated input]
>> >> [wens at csie.org: use cubieboard2 regulator nodes as example]
>> >> [wens at csie.org: change dcdc-workmode to dcdc-workmode-pwm boolean property]
>> >> [wens at csie.org: use clock-frequency for dcdc regulator work frequency]
>> >> Signed-off-by: Chen-Yu Tsai <wens at csie.org>
>> >> ---
>> >> Documentation/devicetree/bindings/mfd/axp20x.txt | 102 +++++++++++++++++++++++
>> >> 1 file changed, 102 insertions(+)
>> >> create mode 100644 Documentation/devicetree/bindings/mfd/axp20x.txt
>> >
>> > This looks okay to me now.
>> >
>> > If Mark is happy with the remainder, I'll merge this.
>>
>> So Mark is not happy with this actually, for a few reasons:
>>
>> 1. The driver was already merged a couple versions back, and
>> we have been using the dcdc-freq binding.
>>
>> 2. Furthermore, the dcdc-freq binding has nothing to do with
>> the common clock framework. Using the clock-frequencies
>> binding implies it does.
>>
>> 3. The change from a integer value to a boolean flag for
>> dcdc-mode makes it less capable, i.e. the kernel can't
>> just accept the current state of the hardware, which
>> should be a valid option for regulators to not screw
>> up the system accidentally.
>>
>> Any chance you could merge the previous version (v8)?
>
> You'll have to re-send it as v10 and obtain Acks in the normal way.
OK. Before I do, would it be easier on you and Mark to have
separate binding files for the mfd and regulator bits?
I noticed a few PMICs have separate files.
Thanks
ChenYu
>> > For my own reference:
>> > Acked-by: Lee Jones <lee.jones at linaro.org>
>> >
>> >> diff --git a/Documentation/devicetree/bindings/mfd/axp20x.txt b/Documentation/devicetree/bindings/mfd/axp20x.txt
>> >> new file mode 100644
>> >> index 000000000000..c3c80db242c7
>> >> --- /dev/null
>> >> +++ b/Documentation/devicetree/bindings/mfd/axp20x.txt
>> >> @@ -0,0 +1,102 @@
>> >> +AXP202/AXP209 device tree bindings
>> >> +
>> >> +The axp20x family current members :
>> >> +axp202 (X-Powers)
>> >> +axp209 (X-Powers)
>> >> +
>> >> +Required properties:
>> >> +- compatible: "x-powers,axp202" or "x-powers,axp209"
>> >> +- reg: The I2C slave address for the AXP chip
>> >> +- interrupt-parent: The parent interrupt controller
>> >> +- interrupts: SoC NMI / GPIO interrupt connected to the PMIC's IRQ pin
>> >> +- interrupt-controller: axp20x has its own internal IRQs
>> >> +- #interrupt-cells: Should be set to 1
>> >> +- regulators: A node that houses a sub-node for each regulator. The regulators
>> >> + are bound using their name as listed here: dcdc2, dcdc3, ldo1,
>> >> + ldo2, ldo3, ldo4, ldo5. The bindings details of individual
>> >> + regulator device can be found in:
>> >> + Documentation/devicetree/bindings/regulator/regulator.txt with
>> >> + the exception of x-powers,dcdc-freq. Regulators not used should
>> >> + still be listed for completeness and that the regulator subsystem
>> >> + properly registers them.
>> >> +
>> >> +Optional properties:
>> >> +- regulator supplies - may be omitted if inputs are unregulated, such as using
>> >> + the IPSOUT output from the PMIC
>> >> + - acin-supply: The input supply for LDO1
>> >> + - vin2-supply: The input supply for DCDC2
>> >> + - vin3-supply: The input supply for DCDC3
>> >> + - ldo24in-supply: The input supply for LDO2, LDO4
>> >> + - ldo3in-supply: The input supply for LDO3
>> >> + - ldo5in-supply: The input supply for LDO5
>> >> +
>> >> +Optional properties for regulators node:
>> >> +- clock-frequency: defines the work frequency of DC-DC regulators
>> >> + (range: 750kHz - 1875kHz). Default: 1.5MHz
>> >> +
>> >> +Optional properties for DCDC regulators:
>> >> +- x-powers,dcdc-workmode-pwm: Force the DCDC regulators to run in PWM mode
>> >> + The DCDC regulators rormally work in a mixed
>> >> + PWM/PFM mode, using PFM under light loads and
>> >> + switching to PWM for heavier loads. Forcing
>> >> + PWM mode trades efficiency under light loads
>> >> + for lower output noise. This probably makes
>> >> + sense for HiFi audio related applications that
>> >> + aren't battery constrained.
>> >> +
>> >> +Example:
>> >> +
>> >> +axp209: pmic at 34 {
>> >> + compatible = "x-powers,axp209";
>> >> + reg = <0x34>;
>> >> + interrupt-parent = <&nmi_intc>;
>> >> + interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>> >> + interrupt-controller;
>> >> + #interrupt-cells = <1>;
>> >> +
>> >> + regulators {
>> >> + clock-frequency = <1500000>;
>> >> +
>> >> + vdd_cpu: dcdc2 {
>> >> + regulator-always-on;
>> >> + regulator-min-microvolt = <1000000>;
>> >> + regulator-max-microvolt = <1450000>;
>> >> + regulator-name = "vdd-cpu";
>> >> + };
>> >> +
>> >> + vdd_int_dll: dcdc3 {
>> >> + regulator-always-on;
>> >> + regulator-min-microvolt = <1000000>;
>> >> + regulator-max-microvolt = <1400000>;
>> >> + regulator-name = "vdd-int-dll";
>> >> + };
>> >> +
>> >> + vdd_rtc: ldo1 {
>> >> + regulator-always-on;
>> >> + regulator-min-microvolt = <1200000>;
>> >> + regulator-max-microvolt = <1400000>;
>> >> + regulator-name = "vdd-rtc";
>> >> + };
>> >> +
>> >> + avcc: ldo2 {
>> >> + regulator-always-on;
>> >> + regulator-min-microvolt = <2700000>;
>> >> + regulator-max-microvolt = <3300000>;
>> >> + regulator-name = "avcc";
>> >> + };
>> >> +
>> >> + ldo3 {
>> >> + /* unused */
>> >> + };
>> >> +
>> >> + csi1_io_2v8: ldo4 {
>> >> + /* output on extension headers */
>> >> + regulator-name = "csi1-io-2v8";
>> >> + };
>> >> +
>> >> + ldo5 {
>> >> + /* unused */
>> >> + };
>> >> + };
>> >> +};
>> >> +
>> >
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
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