[PATCH v2 2/3] iio: adc: mt7622: add support for suspend/resume.

[Zhiyong Tao]

This patch supports auxadc suspend/resume flow.
Disable auxadc clk and power in suspend function.
Enable axuadc clk and power in resume function.

Signed-off-by: Zhiyong Tao <zhiyong....@mediatek.com>
---
 drivers/iio/adc/mt6577_auxadc.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 2d104c8..c174b73 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -184,6 +184,39 @@ static int mt6577_auxadc_read_raw(struct iio_dev 
*indio_dev,
        .read_raw = &mt6577_auxadc_read_raw,
 };
 
+#ifdef CONFIG_PM_SLEEP
+static int __maybe_unused mt6577_auxadc_resume(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+       int ret;
+
+       ret = clk_prepare_enable(adc_dev->adc_clk);
+       if (ret) {
+               pr_err("failed to enable auxadc clock\n");
+               return ret;
+       }
+
+       mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+                             MT6577_AUXADC_PDN_EN, 0);
+       mdelay(MT6577_AUXADC_POWER_READY_MS);
+
+       return 0;
+}
+
+static int __maybe_unused mt6577_auxadc_suspend(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+
+       mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+                             0, MT6577_AUXADC_PDN_EN);
+       clk_disable_unprepare(adc_dev->adc_clk);
+
+       return 0;
+}
+#endif
+
 static int mt6577_auxadc_probe(struct platform_device *pdev)
 {
        struct mt6577_auxadc_device *adc_dev;
@@ -269,6 +302,10 @@ static int mt6577_auxadc_remove(struct platform_device 
*pdev)
        return 0;
 }
 
+static SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
+                        mt6577_auxadc_suspend,
+                        mt6577_auxadc_resume);
+
 static const struct of_device_id mt6577_auxadc_of_match[] = {
        { .compatible = "mediatek,mt2701-auxadc", },
        { .compatible = "mediatek,mt8173-auxadc", },
@@ -280,6 +317,7 @@ static int mt6577_auxadc_remove(struct platform_device 
*pdev)
        .driver = {
                .name   = "mt6577-auxadc",
                .of_match_table = mt6577_auxadc_of_match,
+               .pm = &mt6577_auxadc_pm_ops,
        },
        .probe  = mt6577_auxadc_probe,
        .remove = mt6577_auxadc_remove,
-- 
1.7.9.5