Stephen Warren wrote at Tuesday, November 22, 2011 6:21 PM:
Add complete bindings to instantiate and configure the codec and top-level audio complex on all currently supported boards using the Tegra+WM8903 audio driver.
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diff --git a/arch/arm/boot/dts/tegra-harmony.dts b/arch/arm/boot/dts/tegra-harmony.dts
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- sound {
compatible = "nvidia,tegra-audio-wm8903-harmony","nvidia,tegra-audio-wm8903";
Thinking about that more, I'd like to change this from nvidia,tegra-audio* to nvidia,tegra20-audio*. That's because the current ASoC machine driver, which is what matches that compatible flag, is slightly Tegra20-specific because it makes calls to the Tegra20-specific DAS driver. On Tegra30, this is replaced by a Tegra30 (and later?) AHUB driver. To avoid the Tegra+WM8903 ASoC machine driver module depending on both the Tegra20 DAS module and the Tegra30 AHUB module, I'd like to create separate ASoC machine drivers for the two Tegra chips, which parameterize a core machine driver (e.g. by passing an ops/vtable). This requires versioned compatible flags so that different drivers can be instantiated.