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dm: sound: Create a uclass for i2s

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The i2s bus is commonly used with audio codecs. It provides a way to
stream digital data sychronously in both directions. U-Boot only supports
audio output, so this uclass is very simple, with a single tx_data()
method.

Add a uclass and a test for i2s.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2018-12-10 10:37:34 -07:00
parent ce6d99a056
commit e96fa6c911
9 changed files with 163 additions and 6 deletions
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7
arch/sandbox/dts/test.dts
View File

@@ -47,7 +47,7 @@
#sound-dai-cells = <1>;
};
cros_ec: cros-ec {
cros_ec: cros-ec {
reg = <0 0>;
compatible = "google,cros-ec-sandbox";
@@ -378,6 +378,11 @@
u-boot,dm-pre-reloc;
};
i2s: i2s {
compatible = "sandbox,i2s";
#sound-dai-cells = <1>;
};
misc-test {
compatible = "sandbox,misc_sandbox";
};

10
arch/sandbox/include/asm/test.h
View File

@@ -131,4 +131,14 @@ void sandbox_get_codec_params(struct udevice *dev, int *interfacep, int *ratep,
int *mclk_freqp, int *bits_per_samplep,
uint *channelsp);
/**
* sandbox_get_i2s_sum() - Read back the sum of the audio data so far
*
* This data is provided to the sandbox driver by the I2S tx_data() method.
*
* @dev: Device to check
* @return sum of audio data
*/
int sandbox_get_i2s_sum(struct udevice *dev);
#endif