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serial: of-serial: add PM suspend/resume support
This adds PM suspend/resume support for the of-serial driver to provide power management support on devices attatched to it. Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 27 additions and 0 deletions
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@ -240,6 +240,32 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int of_serial_suspend(struct device *dev)
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{
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struct of_serial_info *info = dev_get_drvdata(dev);
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serial8250_suspend_port(info->line);
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if (info->clk)
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clk_disable_unprepare(info->clk);
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return 0;
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}
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static int of_serial_resume(struct device *dev)
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{
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struct of_serial_info *info = dev_get_drvdata(dev);
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if (info->clk)
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clk_prepare_enable(info->clk);
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serial8250_resume_port(info->line);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(of_serial_pm_ops, of_serial_suspend, of_serial_resume);
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/*
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* A few common types, add more as needed.
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*/
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@ -271,6 +297,7 @@ static struct platform_driver of_platform_serial_driver = {
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.name = "of_serial",
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.owner = THIS_MODULE,
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.of_match_table = of_platform_serial_table,
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.pm = &of_serial_pm_ops,
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},
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.probe = of_platform_serial_probe,
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.remove = of_platform_serial_remove,
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