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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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32
include/i2s.h
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@@ -87,17 +87,41 @@ struct i2s_uc_priv {
unsigned int id; /* I2S controller id */
};
/* Operations for i2s devices */
struct i2s_ops {
/**
* tx_data() - Transmit audio data
*
* @dev: I2C device
* @data: Data buffer to play
* @data_size: Size of data buffer in bytes
* @return 0 if OK, -ve on error
*/
int (*tx_data)(struct udevice *dev, void *data, uint data_size);
};
#define i2s_get_ops(dev) ((struct i2s_ops *)(dev)->driver->ops)
/**
* i2s_tx_data() - Transmit audio data
*
* @dev: I2C device
* @data: Data buffer to play
* @data_size: Size of data buffer in bytes
* @return 0 if OK, -ve on error
*/
int i2s_tx_data(struct udevice *dev, void *data, uint data_size);
/*
* Sends the given data through i2s tx
*
* @param pi2s_tx pointer of i2s transmitter parameter structure.
* @param data address of the data buffer
* @param data_size array size of the int buffer (total size / size of int)
*
* @param data_size size of the data (in bytes)
* @return int value 0 for success, -1 in case of error
*/
int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, unsigned int *data,
unsigned long data_size);
int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data,
uint data_size);
/*
* Initialise i2s transmiter