linux-kernel - Re: [PATCH v1 1/4] arm64: dts: ti: k3-am62x: Enable AUDIO

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Message-ID: <20230802140020.k233zqpjar5ag4iv@outbreak>
Date:   Wed, 2 Aug 2023 09:00:20 -0500
From:   Nishanth Menon <nm@...com>
To:     Francesco Dolcini <francesco@...cini.it>
CC:     Jai Luthra <j-luthra@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v1 1/4] arm64: dts: ti: k3-am62x: Enable AUDIO_REFCLKx

On 15:41-20230802, Francesco Dolcini wrote:
> On Wed, Aug 02, 2023 at 08:32:44AM -0500, Nishanth Menon wrote:
> > On 13:37-20230802, Francesco Dolcini wrote:
> > > Il 2 agosto 2023 13:23:50 CEST, Jai Luthra <j-luthra@...com> ha scritto:
> > > >On Jul 31, 2023 at 16:21:32 +0200, Francesco Dolcini wrote:
> > > >> From: Jai Luthra <j-luthra@...com>
> > > >> 
> > > >> On AM62-based SoCs the AUDIO_REFCLKx clocks can be used as an input to
> > > >> external peripherals when configured through CTRL_MMR, so add the
> > > >> clock nodes.
> > > >> 
> > > >> Signed-off-by: Jai Luthra <j-luthra@...com>
> > > >> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> > > >> ---
> > > >>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi  | 18 ++++++++++++++++++
> > > >>  arch/arm64/boot/dts/ti/k3-am62a-main.dtsi | 18 ++++++++++++++++++
> > > >
> > > >Given currently none of the AM62A boards are using the refclks, can you 
> > > >drop those or just mark the nodes as disabled. Whoever is the first user 
> > > >can enable them.
> > > 
> > > I can drop the 2 clocks from AM62A, however, should we really do it?
> > > These clocks exist and they are just defined in the DTS, they are
> > > not going to be enabled if not used, "ti,am62-epwm-tbclk" is also
> > > not disabled for example.
> > 
> > Overall, the SoC clock as such has nothing to do with board specific, so
> > leave it default (enabled) in SoC.dts - just want to make sure that the
> > clk-parent selection doesn't get in the way of platforms and is a sane
> > default.
> 
> When I looked into that, months ago, this looked to me the correct and a
> sane default. I had the same in our downstream way before the addition
> from Jai Luthra to the SoC dtsi.
> 
> Not sure if Jai can add more on that regard.
> 
> > pll2_hsdiv8 output - which looks like the default mux value anyways..
> > I am ok for it being explicit, but wondering if that works for boards
> > that do not use this default.
> 
> IFF needed, it would be very easy to just override from the board dts,
> using the labels that are already there (audio_refclk0, audio_refclk1).

Jai: This sounds sane to me, if you are OK as well, I'd appreciate a reviewed-by

> 
> > (sidenote): Fransesco - your new mail client has line wrap issues ;)
> Yep, I had the crazy idea to reply from my mobile phone while having a
> walk. It's already a success that I did not top post ;-)

hehe ;)

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