diff options
| author | Fabio Estevam <fabio.estevam@freescale.com> | 2014-10-02 17:36:05 -0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-10-03 11:20:38 +0100 |
| commit | 6f4d2b3177ee3352e70c90f327e2dea3809c263e (patch) | |
| tree | 4d4fe0f5128dc650730a36258b52230956b4bca3 /sound/soc/codecs/sgtl5000.c | |
| parent | fa558d0130debf847b6b8cd95880a2d7556770ac (diff) | |
| download | blackbird-obmc-linux-6f4d2b3177ee3352e70c90f327e2dea3809c263e.tar.gz blackbird-obmc-linux-6f4d2b3177ee3352e70c90f327e2dea3809c263e.zip | |
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>
Diffstat (limited to 'sound/soc/codecs/sgtl5000.c')
| -rw-r--r-- | sound/soc/codecs/sgtl5000.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index 7ef2687b396f..3e9db43ed760 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -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; |
