linux-kernel - Re: [PATCH v4 1/5] dt-bindings: mfd: add document bindings for mp2629

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Message-ID: <20200408101506.GI30614@dell>
Date:   Wed, 8 Apr 2020 11:15:06 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     saravanan sekar <sravanhome@...il.com>
Cc:     robh+dt@...nel.org, jic23@...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 v4 1/5] dt-bindings: mfd: add document bindings for mp2629

On Tue, 07 Apr 2020, saravanan sekar wrote:

> Hi Lee,
> 
> On 30/03/20 8:46 am, Lee Jones wrote:
> > On Fri, 27 Mar 2020, saravanan sekar wrote:
> > > On 27/03/20 9:00 am, Lee Jones wrote:
> > > > On Sun, 22 Mar 2020, Saravanan Sekar wrote:
> > > > 
> > > > > Add device tree binding information for mp2629 mfd driver.
> > > > > 
> > > > > Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
> > > > > ---
> > > > >    .../devicetree/bindings/mfd/mps,mp2629.yaml   | 60 +++++++++++++++++++
> > > > >    1 file changed, 60 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..314309ea91ac
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/mfd/mps,mp2629.yaml
> > > > > @@ -0,0 +1,60 @@
> > > > > +# SPDX-License-Identifier: GPL-2.0
> > > > > +%YAML 1.2
> > > > > +---
> > > > > +$id: http://devicetree.org/schemas/mfd/mps,mp2629.yaml#
> > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > Are these links supposed to work?
> > > Not really, but as far my understanding needed for dt-bindings check
> > Rob, why are these here if they just result in 404s?
> > 
> > > > > +examples:
> > > > > +  - |
> > > > > +    #include <dt-bindings/interrupt-controller/irq.h>
> > > > > +    #include <dt-bindings/input/linux-event-codes.h>
> > > > > +    i2c {
> > > > i2c@...???????
> > > Its a I2C controller node, I don't think address is needed. Mention like
> > > this my previous other driver patches,
> > This doesn't sound right.
> > 
> > How do you control/operate the controller?
> > 
> > Surely you read/write from/to registers?
> 
> 
> Indeed, but each SoC will have different address so which address to mention
> here.
> For me it should be like &i2c {}, anyhow I respect maintainers review (I can
> give RPi I2c bus address used for testing)
> and wait for Rob's reply

It's only an example.  It doesn't have to match any real H/W.

> > > dt_binding_check is also passed
> > > 
> > > > > +        #address-cells = <1>;
> > > > > +        #size-cells = <0>;
> > > > > +
> > > > > +        pmic@4b {
> > > > > +            compatible = "mps,mp2629";
> > > > > +            reg = <0x4b>;
> > > > > +
> > > > > +            interrupt-controller;
> > > > > +            interrupt-parent = <&gpio2>;
> > > > > +            #interrupt-cells = <2>;
> > > > > +            interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> > > > > +        };
> > > > > +    };

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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