ASoC: sgtl5000: Do a sanity check on SYS_MCLK
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>
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 7ef2687..3e9db43 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1445,6 +1445,7 @@
{
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 @@
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;