linux-kernel - Re: [PATCH] ARM64: dts: imx8mm-evk: Assigned clocks for audio plls

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Date:   Tue, 19 May 2020 13:29:31 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     "S.j. Wang" <shengjiu.wang@....com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        Jacky Bai <ping.bai@....com>, Jun Li <jun.li@....com>,
        Leonard Crestez <leonard.crestez@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM64: dts: imx8mm-evk: Assigned clocks for audio plls

On Wed, Oct 16, 2019 at 3:36 AM S.j. Wang <shengjiu.wang@....com> wrote:
>
> Assign clocks and clock-rates for audio plls, that audio
> drivers can utilize them.
>
> Add dai-tdm-slot-num and dai-tdm-slot-width for sound-wm8524,
> that sai driver can generate correct bit clock.
>
> Fixes: 13f3b9fdef6c ("arm64: dts: imx8mm-evk: Enable audio codec wm8524")
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 2 ++
>  arch/arm64/boot/dts/freescale/imx8mm.dtsi    | 8 ++++++--
>  2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> index f7a15f3904c2..13137451b438 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> @@ -62,6 +62,8 @@
>
>                 cpudai: simple-audio-card,cpu {
>                         sound-dai = <&sai3>;
> +                       dai-tdm-slot-num = <2>;
> +                       dai-tdm-slot-width = <32>;
>                 };
>

Shengjiu,

Can you explain the why dai-tdm-slot-width here is 32? I noticed when
I assigned that for an imx8mm board I'm working on (that uses a
tlv320aic3x codec) I ended up with the clock being off by a factor of
2 (audio playback was 2x too slow).

Best Regards,

Tim