linux-kernel - Re: dts: fun with chip names Re: [PATCH v3 1/2] dt: bindings: lm3692x: Add bindings for lm3692x LED driver

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Date:   Thu, 16 Nov 2017 14:36:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Dan Murphy <dmurphy@...com>, Mark Rutland <mark.rutland@....com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>
Subject: Re: dts: fun with chip names Re: [PATCH v3 1/2] dt: bindings:
 lm3692x: Add bindings for lm3692x LED driver

On Thu, Nov 16, 2017 at 2:11 PM, Pavel Machek <pavel@....cz> wrote:
> Hi!
>
>> >> +Required properties:
>> >> +  - compatible:
>> >> +          "ti,lm3692x"
>> >
>> > Don't use wildcards in compatible strings.
>>
>> Do you mean to remove the x?  How do we denote a family of parts
>> then?
>
> I guess you should specify the exact chip.
>
> Which will present interesting problem for me on Nokia N9/N950; in one
> case, compatible chip is produced by two companies, and it looks like
> some machines have one and some have the other; but we'd like to share
> the dts as user has no chance telling them apart (and it is not
> important, anyway).
>
> In second case, chip is refered as APDS990X and I don't know where to
> get more exact data.

There's always exceptions to rules. Just make the case for it. IIRC,
there was the same case for the BT chip.

Rob