* [PATCH] clk: cs2000: add Suspend/Redume feature
@ 2017-01-10 6:50 Kuninori Morimoto
2017-01-21 0:19 ` Stephen Boyd
0 siblings, 1 reply; 2+ messages in thread
From: Kuninori Morimoto @ 2017-01-10 6:50 UTC (permalink / raw)
To: Simon, Michael Turquette, Stephen Boyd
Cc: Magnus, linux-renesas-soc, linux-kernel, linux-clk,
linux-arm-kernel, Gaku Inami, Khiem Nguyen
From: Khiem Nguyen <khiem.nguyen.xt@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@rvc.renesas.com>
[Kuninori: cleanup original patch]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] clk: cs2000: add Suspend/Redume feature
2017-01-10 6:50 [PATCH] clk: cs2000: add Suspend/Redume feature Kuninori Morimoto
@ 2017-01-21 0:19 ` Stephen Boyd
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Boyd @ 2017-01-21 0:19 UTC (permalink / raw)
To: Kuninori Morimoto
Cc: Simon, Michael Turquette, Magnus, linux-renesas-soc,
linux-kernel, linux-clk, linux-arm-kernel, Gaku Inami,
Khiem Nguyen
On 01/10, Kuninori Morimoto wrote:
> From: Khiem Nguyen <khiem.nguyen.xt@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@rvc.renesas.com>
> [Kuninori: cleanup original patch]
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
> ---
Applied to clk-next
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply [flat|nested] 2+ messages in thread
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