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clk: imx: scu: add suspend/resume support

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Clock state will be lost when its power domain is completely off
during system suspend/resume. So we save and restore the state
accordingly in suspend/resume callback.

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Dong Aisheng 2020-07-29 16:00:14 +08:00 committed by Shawn Guo
parent 78edeb0803
commit d0409631f4
1 changed files with 49 additions and 0 deletions
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49
drivers/clk/imx/clk-scu.c
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@ -45,6 +45,10 @@ struct clk_scu {
struct clk_hw hw;
u16 rsrc_id;
u8 clk_type;
/* for state save&restore */
bool is_enabled;
u32 rate;
};
/*
@ -430,6 +434,9 @@ struct clk_hw *__imx_clk_scu(struct device *dev, const char *name,
hw = ERR_PTR(ret);
}
if (dev)
dev_set_drvdata(dev, clk);
return hw;
}
@ -486,10 +493,52 @@ static int imx_clk_scu_probe(struct platform_device *pdev)
return 0;
}
static int __maybe_unused imx_clk_scu_suspend(struct device *dev)
{
struct clk_scu *clk = dev_get_drvdata(dev);
clk->rate = clk_hw_get_rate(&clk->hw);
clk->is_enabled = clk_hw_is_enabled(&clk->hw);
if (clk->rate)
dev_dbg(dev, "save rate %d\n", clk->rate);
if (clk->is_enabled)
dev_dbg(dev, "save enabled state\n");
return 0;
}
static int __maybe_unused imx_clk_scu_resume(struct device *dev)
{
struct clk_scu *clk = dev_get_drvdata(dev);
int ret = 0;
if (clk->rate) {
ret = clk_scu_set_rate(&clk->hw, clk->rate, 0);
dev_dbg(dev, "restore rate %d %s\n", clk->rate,
!ret ? "success" : "failed");
}
if (clk->is_enabled) {
ret = clk_scu_prepare(&clk->hw);
dev_dbg(dev, "restore enabled state %s\n",
!ret ? "success" : "failed");
}
return ret;
}
static const struct dev_pm_ops imx_clk_scu_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_scu_suspend,
imx_clk_scu_resume)
};
static struct platform_driver imx_clk_scu_driver = {
.driver = {
.name = "imx-scu-clk",
.suppress_bind_attrs = true,
.pm = &imx_clk_scu_pm_ops,
},
.probe = imx_clk_scu_probe,
};