linux-kernel - Re: [PATCH 1/4] dt-bindings: timer: Add am6 compatible for ti-timer

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Message-ID: <20220408073418.4yjs3ykt34fhqjco@boondocks>
Date:   Fri, 8 Apr 2022 02:34:18 -0500
From:   Nishanth Menon <nm@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, Keerthy <j-keerthy@...com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH 1/4] dt-bindings: timer: Add am6 compatible for ti-timer

On 07:38-20220408, Tony Lindgren wrote:
> Hi,
> 
> * Nishanth Menon <nm@...com> [220407 13:31]:
> > On 10:10-20220407, Tony Lindgren wrote:
> > > diff --git a/Documentation/devicetree/bindings/timer/ti,timer.txt b/Documentation/devicetree/bindings/timer/ti,timer.txt
> > > --- a/Documentation/devicetree/bindings/timer/ti,timer.txt
> > > +++ b/Documentation/devicetree/bindings/timer/ti,timer.txt
> > > @@ -14,6 +14,7 @@ Required properties:
> > >  			ti,omap5430-timer (applicable to OMAP543x devices)
> > >  			ti,am335x-timer	(applicable to AM335x devices)
> > >  			ti,am335x-timer-1ms (applicable to AM335x devices)
> > > +			ti,am6-timer (applicable to AM6 devices)
> > 
> > Suggestion:
> > 
> > Could we call this ti,am65-timer instead? AM6 is a bit nuanced and spans
> > a couple of sub SoC architectures.
> 
> I think the timer hardware is the same across am64, am65 and j7. So we
> should pick something to represent the am6 timers as it would allow using
> shared dtsi files for the 16 - 30 timers there are.
> 
> Using shared timer dtsi files should work as long as the clocks are
> defined in include/dt-bindings/clock for each SoC, and assuming we can use
> the same compatible property for the timers.

Compatible should work fine, Though I doubt clock and other indices
(base address etc will scale appropriately), but we could give it a
shot, but we can discuss that in the context of the dts patches.

> 
> Of course if the timers are really different across am64, am65 and j72
> then multiple compatible properties are neeeded.
> 
> If the timer hardware is the same, then I guess we should just pick the
> earliest version, so how about using ti,am64-timer?

yep - the oldest version will be ti,am654-timer ( AM65 was the first
K3 device. Unfortunately, the numbering does'nt follow a chronological
order)

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D