diff options
| author | Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com> | 2017-01-10 06:50:58 +0000 |
|---|---|---|
| committer | Stephen Boyd <sboyd@codeaurora.org> | 2017-01-20 16:17:39 -0800 |
| commit | c567fb37f123511d752a454fb11d8bcaf46a7895 (patch) | |
| tree | cbafdd253431f11a30ae7bee2cceacd30e51ba56 | |
| parent | 3e1aec4e2c415346df7d5429f7413837ddaaedd7 (diff) | |
| download | linux-c567fb37f123511d752a454fb11d8bcaf46a7895.tar.bz2 | |
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>
| -rw-r--r-- | drivers/clk/clk-cs2000-cp.c | 22 |
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, |