linux-kernel - Re: [PATCH 1/2] slimbus: ngd: dt-bindings: Add slim ngd dt bindings

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Date:   Wed, 23 May 2018 14:28:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Karthikeyan Ramasubramanian <kramasub@...eaurora.org>,
        sdharia@...cinc.com, girishm@...cinc.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        devicetree@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>
Subject: Re: [PATCH 1/2] slimbus: ngd: dt-bindings: Add slim ngd dt bindings

On Wed, May 23, 2018 at 1:11 PM, Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
>
> On 23/05/18 17:40, Rob Herring wrote:
>>>
>>> +
>>> +- qcom,ngd-id
>>> +       Usage: required
>>> +       Value type: <u32>
>>> +       Definition: ngd instance id in the controller
>>
>> Why do you need this?
>>
> Please ignore my comment from previous reply.
>
> There are more than one instances of ngd in this slim controller.
> We need this to make sure we are programming the correct one.

Doesn't the parent-child relationship of devices on the bus provide
that? If you mean to provide consistent numbering to userspace, then
that's not a DT problem (nor one that Linux plans to solve).

> We also need this instance ID during powering it up using QMI.

Wouldn't that be a QMI ID?

Rob