mirror of https://gitee.com/openkylin/linux.git
i2c: designware: add PM support
This patch adds in support for standby/S2R/hybernate for i2c-designware driver. Signed-off-by: Deepak Sikri <deepak.sikri@st.com> Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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@ -36,6 +36,7 @@
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#include <linux/interrupt.h>
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#include <linux/of_i2c.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include "i2c-designware-core.h"
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@ -198,6 +199,31 @@ static const struct of_device_id dw_i2c_of_match[] = {
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MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
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#endif
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#ifdef CONFIG_PM
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static int dw_i2c_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
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clk_disable(i_dev->clk);
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return 0;
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}
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static int dw_i2c_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
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clk_enable(i_dev->clk);
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i2c_dw_init(i_dev);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);
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/* work with hotplug and coldplug */
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MODULE_ALIAS("platform:i2c_designware");
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@ -207,6 +233,7 @@ static struct platform_driver dw_i2c_driver = {
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.name = "i2c_designware",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(dw_i2c_of_match),
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.pm = &dw_i2c_dev_pm_ops,
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},
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};
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