[PATCH v5 1/3] iio: adc: rockchip_saradc: move all of probe to devm-functions

Heiko Stuebner
2020-04-19T10:02:05Z

From: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>

Parts of the saradc probe rely on devm functions and later parts do not.
This makes it more difficult to for example enable triggers via their
devm-functions and would need more undo-work in remove.

So to make life easier for the driver, move the rest of probe calls
also to their devm-equivalents.

This includes moving the clk- and regulator-disabling to a devm_action
so that they gets disabled both during remove and in the error case
in probe, after the action is registered.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
---
changes in v5:
- none
changes in v4:
- new patch as suggested by Jonathan

drivers/iio/adc/rockchip_saradc.c | 37 ++++++++++++++++---------------
1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 582ba047c4a6..270eb7e83823 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -193,6 +193,15 @@ static void rockchip_saradc_reset_controller(struct reset_control *reset)
reset_control_deassert(reset);
}

+static void rockchip_saradc_disable(void *data)
+{
+ struct rockchip_saradc *info = data;
+
+ clk_disable_unprepare(info->clk);
+ clk_disable_unprepare(info->pclk);
+ regulator_disable(info->vref);
+}
+
static int rockchip_saradc_probe(struct platform_device *pdev)
{
struct rockchip_saradc *info = NULL;
@@ -304,6 +313,14 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
goto err_pclk;
}

+ ret = devm_add_action_or_reset(&pdev->dev,
+ rockchip_saradc_disable, info);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register devm action, %d\n",
+ ret);
+ return ret;
+ }
+
platform_set_drvdata(pdev, indio_dev);

indio_dev->name = dev_name(&pdev->dev);
@@ -315,14 +332,12 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
indio_dev->channels = info->data->channels;
indio_dev->num_channels = info->data->num_channels;

- ret = iio_device_register(indio_dev);
+ ret = devm_iio_device_register(&pdev->dev, indio_dev);
if (ret)
- goto err_clk;
+ return ret;

return 0;

-err_clk:
- clk_disable_unprepare(info->clk);
err_pclk:
clk_disable_unprepare(info->pclk);
err_reg_voltage:
@@ -330,19 +345,6 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
return ret;
}

-static int rockchip_saradc_remove(struct platform_device *pdev)
-{
- struct iio_dev *indio_dev = platform_get_drvdata(pdev);
- struct rockchip_saradc *info = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- clk_disable_unprepare(info->clk);
- clk_disable_unprepare(info->pclk);
- regulator_disable(info->vref);
-
- return 0;
-}
-
#ifdef CONFIG_PM_SLEEP
static int rockchip_saradc_suspend(struct device *dev)
{
@@ -383,7 +385,6 @@ static SIMPLE_DEV_PM_OPS(rockchip_saradc_pm_ops,

static struct platform_driver rockchip_saradc_driver = {
.probe = rockchip_saradc_probe,
- .remove = rockchip_saradc_remove,
.driver = {
.name = "rockchip-saradc",
.of_match_table = rockchip_saradc_match,
--
2.25.1