[PATCH V2] clk: vc5: Add suspend/resume support

* [PATCH V2] clk: vc5: Add suspend/resume support
@ 2018-12-12  1:41 Marek Vasut
  2018-12-12  8:43 ` Laurent Pinchart
  0 siblings, 1 reply; 5+ messages in thread
From: Marek Vasut @ 2018-12-12  1:41 UTC (permalink / raw)
  To: linux-clk
  Cc: linux-renesas-soc, Marek Vasut, Alexey Firago, Laurent Pinchart,
	Michael Turquette, Stephen Boyd

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
---
V2: Replace ifdef with __maybe_unused
    Simplify return value handling in resume
---
 drivers/clk/clk-versaclock5.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
index decffb3826ec..b66586a3abb7 100644
--- a/drivers/clk/clk-versaclock5.c
+++ b/drivers/clk/clk-versaclock5.c
@@ -906,6 +906,34 @@ 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);
+	int ret;
+
+	ret = regcache_sync(vc5->regmap);
+	if (ret != 0) {
+		dev_err(dev, "Failed to save register map: %d\n", ret);
+		return ret;
+	}
+	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 +989,12 @@ 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,
-- 
2.18.0


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