clk: vc5: Add suspend/resume support (8cbdc1f0) · Commits · 戴 / test

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>

drivers/clk/clk-versaclock5.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -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,

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