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clk: vc5: Add suspend/resume support 

Add simple suspend/resume handlers to the driver to restore the chip
configuration after resume. It is possible that the chip was configured
with non-default values before suspend-resume cycle and that the chip
is powered down during this cycle, so the configuration could get lost.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Alexey Firago <alexey_firago@mentor.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-renesas-soc@vger.kernel.org
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Marek Vasut 2018-12-13 17:15:28 +01:00 committed by Stephen Boyd
parent 651022382c
commit 8cbdc1f09f
1 changed files with 25 additions and 0 deletions
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25
drivers/clk/clk-versaclock5.c
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@ -906,6 +906,28 @@ static int vc5_remove(struct i2c_client *client)
return 0;
}
static int __maybe_unused vc5_suspend(struct device *dev)
{
struct vc5_driver_data *vc5 = dev_get_drvdata(dev);
regcache_cache_only(vc5->regmap, true);
regcache_mark_dirty(vc5->regmap);
return 0;
}
static int __maybe_unused vc5_resume(struct device *dev)
{
struct vc5_driver_data *vc5 = dev_get_drvdata(dev);
int ret;
regcache_cache_only(vc5->regmap, false);
ret = regcache_sync(vc5->regmap);
if (ret)
dev_err(dev, "Failed to restore register map: %d\n", ret);
return ret;
}
static const struct vc5_chip_info idt_5p49v5923_info = {
.model = IDT_VC5_5P49V5923,
.clk_fod_cnt = 2,
@ -961,9 +983,12 @@ static const struct of_device_id clk_vc5_of_match[] = {
};
MODULE_DEVICE_TABLE(of, clk_vc5_of_match);
static SIMPLE_DEV_PM_OPS(vc5_pm_ops, vc5_suspend, vc5_resume);
static struct i2c_driver vc5_driver = {
.driver = {
.name = "vc5",
.pm = &vc5_pm_ops,
.of_match_table = clk_vc5_of_match,
},
.probe = vc5_probe,