linux-kernel - Re: [PATCH 1/2] ASoC: da7218: Add bindings documentation for DA7218 audio codec

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Date:	Thu, 5 Nov 2015 14:58:56 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, alsa-devel@...a-project.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Support Opensource <support.opensource@...semi.com>
Subject: Re: [PATCH 1/2] ASoC: da7218: Add bindings documentation for DA7218
 audio codec

On Thu, Nov 05, 2015 at 10:43:15AM +0000, Adam Thomson wrote:

> +- dlg,ldo-lvl : Required internal LDO voltage (mV) level
> +	[<1050>, <1100>, <1200>, <1400>]

Why would this ever be anything other than the minimum voltage, and
might we not want to vary it at runtime?

> +- dlg,biquad-cfg : List of data & address pairs to configure BiQuad filters
> +	[ < {data1} {addr1} {data2} {addr2} ... >; ]
> +- dlg,st-biquad-cfg : List of data & address pairs to configure Sidetone
> +		      BiQuad filters
> +	[ < {data1} {addr1} {data2} {addr2} ... >; ]

These look like DSP coefficients which I would therefore expect to be
configurable at runtime via a binary control rather than specified in
the DT - why are they in the DT?

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