[PATCH 6.1.y] iio: adc: exynos_adc: fix OF populate on driver rebind

[Sasha Levin <sashal@kernel.org>]

From: Johan Hovold <johan@kernel.org>

[ Upstream commit ea6b4feba85e996e840e0b661bc42793df6eb701 ]

Since commit c6e126de43e7 ("of: Keep track of populated platform
devices") child devices will not be created by of_platform_populate()
if the devices had previously been deregistered individually so that the
OF_POPULATED flag is still set in the corresponding OF nodes.

Switch to using of_platform_depopulate() instead of open coding so that
the child devices are created if the driver is rebound.

Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
Cc: stable@vger.kernel.org	# 3.16
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/adc/exynos_adc.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 43c8af41b4a9d..a935ef1840a6f 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -721,14 +721,7 @@ static const struct iio_chan_spec exynos_adc_iio_channels[] = {
 	ADC_CHANNEL(9, "adc9"),
 };
 
-static int exynos_adc_remove_devices(struct device *dev, void *c)
-{
-	struct platform_device *pdev = to_platform_device(dev);
-
-	platform_device_unregister(pdev);
 
-	return 0;
-}
 
 static int exynos_adc_ts_open(struct input_dev *dev)
 {
@@ -929,8 +922,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
 	return 0;
 
 err_of_populate:
-	device_for_each_child(&indio_dev->dev, NULL,
-				exynos_adc_remove_devices);
+	of_platform_depopulate(&indio_dev->dev);
 	if (has_ts) {
 		input_unregister_device(info->input);
 		free_irq(info->tsirq, info);
@@ -959,8 +951,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
 		free_irq(info->tsirq, info);
 		input_unregister_device(info->input);
 	}
-	device_for_each_child(&indio_dev->dev, NULL,
-				exynos_adc_remove_devices);
+	of_platform_depopulate(&indio_dev->dev);
 	iio_device_unregister(indio_dev);
 	free_irq(info->irq, info);
 	if (info->data->exit_hw)
-- 
2.51.0