[alsa-devel] [PATCH 1/8] ASoC: tegra: Add a TDM configuration callback

[Mark Brown]

On Wed, Sep 18, 2019 at 08:33:50AM -0500, Pierre-Louis Bossart wrote:
> On 9/18/19 5:48 AM, Mark Brown wrote:

> > In DSP modes only one edge really matters anyway so it's not super
> > important how long the pulse is.

> There are exceptions to the rule.
> In the early days of SOF, we had to provide support for amplifiers that did
> require a pulse larger than a bit. In the SOF IPC we added an
> 'frame_pulse_width' field to pass the configuration all the way from
> topology to the firmware and Intel SSP driver.
> The other quirk we added is the ability to control zero-padding per slot
> instead of at the end of the frame, e.g. 1 bit of padding after 24 bits when
> using 4 slots w/ 25 bits in a 100-bit frame.

Neither of those is part of the core DSP mode definition though in the
same way that constraints like MCLK or BCLK ratios aren't.  They're
modifiers on top.
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