[alsa-devel] ASoC: special SPI format for that5173 driver in daisy chain mode

Christian Schörkhuber schoerkhuber at iem.at
Wed Oct 10 17:36:30 CEST 2012

Hi all,

I'm working on an ASoC driver for the THAT5173 microphone preamplifier 
which is controlled via SPI. When operating in daisy chain mode (4 amps) 
the desired format is a bit odd: I need to write four 16 bit spi 
commands (one gain setting for each amp) in a row without raising the 
chipselect line between commands.
That is, I need to write one 64 bit SPI command that is composed of 4 
different values (and 4 register addresses which are all 0).

Usually I use regmap but I don't see how I can construct such a message 
with regmap. How can this be done (with or without regmap)?


More information about the Alsa-devel mailing list