[PATCH] clk: cs2000: add Suspend/Redume feature
Kuninori Morimoto
kuninori.morimoto.gx at renesas.com
Mon Jan 9 22:50:58 PST 2017
From: Khiem Nguyen <khiem.nguyen.xt at rvc.renesas.com>
CS2000 needs re-setup when redume, otherwise, it can't
handle correct clock rate.
Signed-off-by: Khiem Nguyen <khiem.nguyen.xt at rvc.renesas.com>
[Kuninori: cleanup original patch]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
drivers/clk/clk-cs2000-cp.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
index 021f3da..3fca052 100644
--- a/drivers/clk/clk-cs2000-cp.c
+++ b/drivers/clk/clk-cs2000-cp.c
@@ -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 @@ static int cs2000_probe(struct i2c_client *client,
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,
--
1.9.1
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