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authorKhiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>2017-01-10 09:50:58 +0300
committerStephen Boyd <sboyd@codeaurora.org>2017-01-21 03:17:39 +0300
commitc567fb37f123511d752a454fb11d8bcaf46a7895 (patch)
treecbafdd253431f11a30ae7bee2cceacd30e51ba56 /drivers/clk/clk-cs2000-cp.c
parent3e1aec4e2c415346df7d5429f7413837ddaaedd7 (diff)
downloadlinux-c567fb37f123511d752a454fb11d8bcaf46a7895.tar.xz
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>
Diffstat (limited to 'drivers/clk/clk-cs2000-cp.c')
-rw-r--r--drivers/clk/clk-cs2000-cp.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
index 021f3daf34e1..3fca0526d940 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 @@ 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,