linux-kernel - Re: [PATCH 5/7] arm64: dts: ti: k3-am62-verdin: Drop McASP AFIFOs

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Date: Wed, 5 Jun 2024 07:52:32 -0500
From: Nishanth Menon <nm@...com>
To: Jai Luthra <j-luthra@...com>
CC: Francesco Dolcini <francesco@...cini.it>,
        Vignesh Raghavendra
	<vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Jayesh Choudhary <j-choudhary@...com>,
        Devarsh Thakkar
	<devarsht@...com>, Bryan Brattlof <bb@...com>,
        Aradhya Bhatia
	<a-bhatia1@...com>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] arm64: dts: ti: k3-am62-verdin: Drop McASP AFIFOs

On 14:28-20240605, Jai Luthra wrote:
> Hi Francesco,
> 
> Thanks for the review.
> 
> On Jun 05, 2024 at 10:47:13 +0200, Francesco Dolcini wrote:
> > Hello Jai, thanks for the patch.
> > 
> > On Tue, Jun 04, 2024 at 03:11:06PM +0530, Jai Luthra wrote:
> > > McASP AFIFOs are not necessary with UDMA-P/BCDMA as there is buffering
> > > on the DMA IP. Drop these for better audio latency.
> > > 
> > > Fixes: 316b80246b16 ("arm64: dts: ti: add verdin am62")
> > > Signed-off-by: Jai Luthra <j-luthra@...com>
> > > ---
> > >  arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi | 8 ++++----
> > >  1 file changed, 4 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> > > index 2038c5e04639..27e5220e1dc7 100644
> > > --- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> > > +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> > > @@ -1364,8 +1364,8 @@ &mcasp0 {
> > >  	       0 0 0 0
> > >  	>;
> > >  	tdm-slots = <2>;
> > > -	rx-num-evt = <32>;
> > > -	tx-num-evt = <32>;
> > > +	rx-num-evt = <0>;
> > > +	tx-num-evt = <0>;
> > 
> > From my understanding of the dt-binding having these properties set to
> > <0> is equivalent to not having those properties at all.
> > My suggestion would be to just remove those, therefore.
> > 
> 
> I was following the existing convention of setting it to 0 for 
> disabling, as done in k3-j721e-common-proc-board.dts
> 
> IMO it is better to keep it explicit, but I don't feel strongly against 
> dropping it either (as long as we do the same for j721e). Will defer the 
> decision to the tree maintainers.
> 

If they are equivalent, then just drop them.

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