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clk: cs2000: add Suspend/Resume feature 

CS2000 needs re-setup when redume, otherwise, it can't
handle correct clock rate.

Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>
[Kuninori: cleanup original patch]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Khiem Nguyen 2017-01-10 06:50:58 +00:00 committed by Stephen Boyd
parent 3e1aec4e2c
commit c567fb37f1
1 changed files with 22 additions and 0 deletions
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22
drivers/clk/clk-cs2000-cp.c
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@ -59,6 +59,10 @@ struct cs2000_priv {
struct i2c_client *client;
struct clk *clk_in;
struct clk *ref_clk;
/* suspend/resume */
unsigned long saved_rate;
unsigned long saved_parent_rate;
};
static const struct of_device_id cs2000_of_match[] = {
@ -286,6 +290,9 @@ static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
if (ret < 0)
return ret;
priv->saved_rate = rate;
priv->saved_parent_rate = parent_rate;
return 0;
}
@ -489,9 +496,24 @@ probe_err:
return ret;
}
static int cs2000_resume(struct device *dev)
{
struct cs2000_priv *priv = dev_get_drvdata(dev);
int ch = 0; /* it uses ch0 only at this point */
return __cs2000_set_rate(priv, ch,
priv->saved_rate,
priv->saved_parent_rate);
}
static const struct dev_pm_ops cs2000_pm_ops = {
.resume_early = cs2000_resume,
};
static struct i2c_driver cs2000_driver = {
.driver = {
.name = "cs2000-cp",
.pm = &cs2000_pm_ops,
.of_match_table = cs2000_of_match,
},
.probe = cs2000_probe,