Commit 9eea8326 authored Jun 30, 2018 by Vignesh R Committed by Lee Jones Oct 09, 2018

iio: adc: ti_am335x_adc: Disable ADC during suspend unconditionally



Parent MFD device takes care of enabling ADC interface whenever
touchscreen is marked wakeup capable. Therefore, unconditionally disable
ADC interface during system suspend to save power in case of system with
just ADC and no TSC.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

parent c974ac77

drivers/iio/adc/ti_am335x_adc.c

+4 −8

Original line number	Diff line number	Diff line
		@@ -693,16 +693,12 @@ static int __maybe_unused tiadc_suspend(struct device *dev)
		{
		struct iio_dev *indio_dev = dev_get_drvdata(dev);
		struct tiadc_device *adc_dev = iio_priv(indio_dev);
		struct ti_tscadc_dev *tscadc_dev;
		unsigned int idle;

		tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
		if (!device_may_wakeup(tscadc_dev->dev)) {
		idle = tiadc_readl(adc_dev, REG_CTRL);
		idle &= ~(CNTRLREG_TSCSSENB);
		tiadc_writel(adc_dev, REG_CTRL, (idle \|
		CNTRLREG_POWERDOWN));
		}

		return 0;
		}

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