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

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Message-ID: <Yk/nmTNL4tm0sd1X@atomide.com>
Date:   Fri, 8 Apr 2022 10:43:21 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Nishanth Menon <nm@...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

* Nishanth Menon <nm@...com> [220408 07:31]:
> 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.

Yeah that's a separate series for sure and can be done later on after we
have am6 timers working first.

> > 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)

OK great, I will use ti,am654-timer then.

Regards,

Tony