linux-kernel - Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks

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Message-ID: <20200702184226.GA23935@Asurada-Nvidia>
Date:   Thu, 2 Jul 2020 11:42:26 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Arnaud Ferraris <arnaud.ferraris@...labora.com>
Cc:     kernel@...labora.com, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks

Hi Arnaud,

On Thu, Jul 02, 2020 at 04:22:31PM +0200, Arnaud Ferraris wrote:
> The current ASRC driver hardcodes the input and output clocks used for
> sample rate conversions. In order to allow greater flexibility and to
> cover more use cases, it would be preferable to select the clocks using
> device-tree properties.

We recent just merged a new change that auto-selecting internal
clocks based on sample rates as the first option -- ideal ratio
mode is the fallback mode now. Please refer to:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20200702&id=d0250cf4f2abfbea64ed247230f08f5ae23979f0

Having a quick review at your changes, I think the DT part may
not be necessary as it's more likely a software configuration.
I personally like the new auto-selecting solution more.

> This series also fix register configuration and clock assignment so
> conversion can be conducted effectively in both directions with a good
> quality.

If there's any further change that you feel you can improve on
the top of mentioned change after rebasing, I'd like to review.

Thanks
Nic