linux-kernel - Re: [PATCH v3 3/3] arm64: dts: meson-axg: add clock DT info for Meson AXG SoC

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Date:   Wed, 06 Dec 2017 11:11:59 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] arm64: dts: meson-axg: add clock DT info for Meson AXG SoC

Stephen Boyd <sboyd@...eaurora.org> writes:

> On 12/01, Jerome Brunet wrote:
>> On Fri, 2017-12-01 at 08:34 -0800, Stephen Boyd wrote:
>> > On 11/30, Yixun Lan wrote:
>> > > Hi Stephen
>> > > 
>> > > On 11/30/17 03:35, Stephen Boyd wrote:
>> > > > 
>> > > > Maybe just call the node "bus@...3c000"?
>> > > > 
>> > > 
>> > > isn't this just a name? what's the benefits to change?
>> > > personally, I tend to keep it this way, because it's better map to the
>> > > data sheet
>> > > 
>> > > we also has 'aobus', 'cbus' scattered there..
>> > 
>> > Per the ePAPR node names are supposed to be generic, like disk,
>> > cpu, display-controller, gpu, etc. I've never heard of a hiubus,
>> > so probably it's some vendor specific thing? We have the phandle
>> > anyway so it's not like we're losing much information here.
>> 
>> Stephen, there is a lot of busses on platform. We can't just call them all
>> 'bus'.
>> I don't get the problem with this name.
>> We are re-using the name from the datasheet here, no fancy invention. It seems
>> to be quite common. 
>> 
>
> Ok. I'm not the maintainer of the DTS so no worries from me. I'm
> just pointing out that the ePAPR says that node names should be
> generic, and 'hiubus' doesn't sound generic to me. If it matches
> some datasheet then I suppose that's good, but probably that sort
> of distinction should have gone into the compatible string
> instead of the node name.

Stephen is right, the node-name should be generic (e.g. "bus") but the
label can (should) be more SoC-specific, so it should look like:

		hiubus: bus@...3c000 {

Note that we weren't strict about this for all the rest of the amlogic
SoCs (mostly because I didn't notice ) but we should start doing it
correctly now.  I'll also clean up the existing DTs.

Kevin