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ASoC: sgtl5000: Do a sanity check on SYS_MCLK

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According to the sgtl5000 datasheet the valid range for SYS_MCLK is from 8 to
27 MHz.

Add a sanity check prior to enabling SYS_MCLK.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Fabio Estevam 2014-10-02 17:36:05 -03:00 committed by Mark Brown
parent fa558d0130
commit 6f4d2b3177
1 changed files with 9 additions and 0 deletions
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9
sound/soc/codecs/sgtl5000.c
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@ -1445,6 +1445,7 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
{
struct sgtl5000_priv *sgtl5000;
int ret, reg, rev;
unsigned int mclk;
sgtl5000 = devm_kzalloc(&client->dev, sizeof(struct sgtl5000_priv),
GFP_KERNEL);
@ -1468,6 +1469,14 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
return ret;
}
/* SGTL5000 SYS_MCLK should be between 8 and 27 MHz */
mclk = clk_get_rate(sgtl5000->mclk);
if (mclk < 8000000 || mclk > 27000000) {
dev_err(&client->dev, "Invalid SYS_CLK frequency: %u.%03uMHz\n",
mclk / 1000000, mclk / 1000 % 1000);
return -EINVAL;
}
ret = clk_prepare_enable(sgtl5000->mclk);
if (ret)
return ret;