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drivers: i2s: Do not support 8-bit word size in LPC I2S driver

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The memory block passed by the user to the i2s_write function is
tightly packed next to each other.
However for 8-bit word_size the I2S hardware expects the data
to be in 2bytes which does not match what is passed by the user.
This will be addressed in a separate PR once the zephyr API committee
finalizes on an I2S API for the user to probe hardware variations.

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
This commit is contained in:
Mahesh Mahadevan 2021-04-14 13:46:03 -05:00 • committed by Maureen Helm
commit 478822f74c
1 changed files with 12 additions and 0 deletions
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12
drivers/i2s/i2s_mcux_flexcomm.c
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@ -201,6 +201,18 @@ static int i2s_mcux_configure(const struct device *dev, enum i2s_dir dir,
return 0;
}
/*
* The memory block passed by the user to the i2s_write function is
* tightly packed next to each other.
* However for 8-bit word_size the I2S hardware expects the data
* to be in 2bytes which does not match what is passed by the user.
* This will be addressed in a separate PR once the zephyr API committee
* finalizes on an I2S API for the user to probe hardware variations.
*/
if (i2s_cfg->word_size <= 8) {
return -ENOTSUP;
}
/* Figure out function base clock */
if (clock_control_get_rate(cfg->clock_dev,
cfg->clock_subsys, &base_frequency)) {