Re: [PATCH v10 1/6] dt-bindings: mfd: add document bindings for mp2629

From: Lee Jones
Date: Mon Apr 20 2020 - 03:19:19 EST


On Sat, 18 Apr 2020, Jonathan Cameron wrote:

> On Sat, 18 Apr 2020 17:01:17 +0200
> saravanan sekar <sravanhome@xxxxxxxxx> wrote:
>
> > Hi Jonathan,
> >
> > On 18/04/20 4:53 pm, Jonathan Cameron wrote:
> > > On Fri, 17 Apr 2020 10:49:58 +0200
> > > Saravanan Sekar <sravanhome@xxxxxxxxx> wrote:
> > >
> > >> Add device tree binding information for mp2629 mfd driver.
> > >>
> > >> Signed-off-by: Saravanan Sekar <sravanhome@xxxxxxxxx>
> > >> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> > >> ---
> > >> .../devicetree/bindings/mfd/mps,mp2629.yaml | 61 +++++++++++++++++++
> > >> 1 file changed, 61 insertions(+)
> > >> create mode 100644 Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> > >>
> > >> diff --git a/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml b/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> > >> new file mode 100644
> > >> index 000000000000..b25b29259d67
> > >> --- /dev/null
> > >> +++ b/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> > >> @@ -0,0 +1,61 @@
> > >> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > >> +%YAML 1.2
> > >> +---
> > >> +$id: http://devicetree.org/schemas/mfd/mps,mp2629.yaml#
> > >> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > >> +
> > >> +title: MP2629 Battery Charger PMIC from Monolithic Power System.
> > >> +
> > >> +maintainers:
> > >> + - Saravanan Sekar <sravanhome@xxxxxxxxx>
> > >> +
> > >> +description: |
> > >> + MP2629 is a PMIC providing battery charging and power supply for smartphones,
> > >> + wireless camera and portable devices. Chip is controlled over I2C.
> > >> +
> > >> + The battery charge management device handles battery charger controller and
> > >> + ADC IIO device for battery, system voltage
> > >> +
> > >> +properties:
> > >> + compatible:
> > >> + const: mps,mp2629
> > >> +
> > >> + reg:
> > >> + maxItems: 1
> > >> +
> > >> + interrupts:
> > >> + maxItems: 1
> > >> +
> > >> + interrupt-controller: true
> > >> +
> > >> + "#interrupt-cells":
> > >> + const: 2
> > >> + description:
> > >> + The first cell is the IRQ number, the second cell is the trigger type.
> > >> +
> > >> +required:
> > >> + - compatible
> > >> + - reg
> > >> + - interrupts
> > >> + - interrupt-controller
> > >> + - "#interrupt-cells"
> > >> +
> > >> +examples:
> > >> + - |
> > >> + #include <dt-bindings/interrupt-controller/irq.h>
> > >> + #include <dt-bindings/input/linux-event-codes.h>
> > >> + i2c@7e205000 {
> > > I thought the general trend for i2c devices was to leave the i2c
> > > part 'vague'.
> > >
> > > i2c {
> > > #address-cells = <1>;
> > > #size-cells = <0>;
> > >
> > > pmic@xxxx etc
> > I agree with you and initial patch was as like above, but Lee was
> > somehow unhappy and not satisfied with
> >
> > my explanations. Please find more info on v4.
>
> Ah. Curious. Oh well - over to Rob for a definitive answer!

I haven't seen this spoken about before. The comments were based
solely on my own views of, the example should provide a solid, valid,
potentially working block for people to use as a reference.

Would an I2C node missing an address be a valid DTS/DTSI entry?

--
Lee Jones [æçæ]
Linaro Services Technical Lead
Linaro.org â Open source software for ARM SoCs
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