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

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Date:   Sat, 18 Apr 2020 17:06:19 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     saravanan sekar <sravanhome@...il.com>
Cc:     lee.jones@...aro.org, andy.shevchenko@...il.com,
        robh+dt@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, sre@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v10 1/6] dt-bindings: mfd: add document bindings for
 mp2629

On Sat, 18 Apr 2020 17:01:17 +0200
saravanan sekar <sravanhome@...il.com> 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@...il.com> wrote:
> >  
> >> Add device tree binding information for mp2629 mfd driver.
> >>
> >> Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
> >> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> >> ---
> >>   .../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@...il.com>
> >> +
> >> +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@...05000 {  
> > I thought the general trend for i2c devices was to leave the i2c
> > part 'vague'.
> >
> >      i2c {
> >            #address-cells = <1>;
> >            #size-cells = <0>;
> >           
> >            pmic@.... 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!

> 
> > Guess it doesn't matter if example contains too much information. Rob?
> >
> > Otherwise looks good to me.
> >
> > Thanks,
> >
> > Jonathan
> >     
> >> +        #address-cells = <1>;
> >> +        #size-cells = <0>;
> >> +        reg = <0x7e205000 0x200>;
> >> +
> >> +        pmic@4b {
> >> +            compatible = "mps,mp2629";
> >> +            reg = <0x4b>;
> >> +
> >> +            interrupt-controller;
> >> +            interrupt-parent = <&gpio2>;
> >> +            #interrupt-cells = <2>;
> >> +            interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> >> +        };
> >> +    };