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Date:   Wed, 29 Apr 2020 16:42:54 -0500
From:   Rob Herring <robh@kernel.org>
To:     Lee Jones <lee.jones@linaro.org>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        saravanan sekar <sravanhome@gmail.com>,
        andy.shevchenko@gmail.com, knaack.h@gmx.de, lars@metafoo.de,
        pmeerw@pmeerw.net, sre@kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
        linux-pm@vger.kernel.org
Subject: Re: [PATCH v10 1/6] dt-bindings: mfd: add document bindings for
 mp2629
Message-ID: <20200429214254.GA9175@bogus>
References: <20200417085003.6124-1-sravanhome@gmail.com>
 <20200417085003.6124-2-sravanhome@gmail.com>
 <20200418155308.681df38f@archlinux>
 <50ffb42e-4080-415e-dd3d-e38f7b0a6071@gmail.com>
 <20200418170619.155222fa@archlinux>
 <20200420071910.GH3737@dell>
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On Mon, Apr 20, 2020 at 08:19:10AM +0100, Lee Jones wrote:
> On Sat, 18 Apr 2020, Jonathan Cameron wrote:
> 
> > On Sat, 18 Apr 2020 17:01:17 +0200
> > saravanan sekar <sravanhome@gmail.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@gmail.com> wrote:
> > > >  
> > > >> Add device tree binding information for mp2629 mfd driver.
> > > >>
> > > >> Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
> > > >> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.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@gmail.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@7e205000 {  
> > > > I thought the general trend for i2c devices was to leave the i2c
> > > > part 'vague'.
> > > >
> > > >      i2c {
> > > >            #address-cells = <1>;
> > > >            #size-cells = <0>;
> > > >           
> > > >            pmic@4b.. etc  
> > > I agree with you and initial patch was as like above, but Lee was 
> > > somehow unhappy and not satisfied with

Jonathan is correct.

> > > 
> > > 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.

I agree that the part matching this schema should be. The rest is just 
boilerplate.

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

i2c-gpio?

Rob