linux-kernel - Re: [PATCH v4 1/2] dt-bindings: timer: Add bindings for Intel Keem Bay SoC Timer

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Date:   Wed, 14 Jul 2021 08:07:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     shruthi.sanil@...el.com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, kris.pan@...ux.intel.com,
        Mark Gross <mgross@...ux.intel.com>,
        srikanth.thokala@...el.com,
        "Raja Subramanian, Lakshmi Bai" 
        <lakshmi.bai.raja.subramanian@...el.com>,
        mallikarjunappa.sangannavar@...el.com
Subject: Re: [PATCH v4 1/2] dt-bindings: timer: Add bindings for Intel Keem
 Bay SoC Timer

On Wed, Jul 14, 2021 at 3:04 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Tue, Jul 13, 2021 at 08:47:56PM -0600, Rob Herring wrote:
> > On Mon, Jun 28, 2021 at 11:44:09AM +0530, shruthi.sanil@...el.com wrote:
>
> > > +  The parent node represents the common general configuration details and
> > > +  the child nodes represents the counter and timers.
> >
> > I don't think all the child nodes are necessary. Are the counters and
> > timers configurable (say on another SoC)? If not, then a single node
> > here would suffice.
>
> If you may notice the children may have different properties that can't be
> known ahead, such as IRQ line. On some platforms it may be this mapping, on
> another it maybe different.

What I noticed is it's all the same clock and 1 interrupt for each
timer can be just a single 'interrupts' property with 8 entries.

Is there a platform that's different or that's a hypothetical? Because
hypothetically, every aspect of every IP could change. But we don't
try to parameterize everything in DT. It's a judgement call between
implying things from compatible and explicit DT properties.

> With all respect for the simplification I think we can't do it here.

You can. Any data in DT could be in the kernel. It's a question of
balance, not can or can't.

Rob