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.tao@xxxxxxxxxxxx>
---
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
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
