staging: iio: Use devm_clk_get_enabled() helper function

The devm_clk_get_enabled() helper:
    - calls devm_clk_get()
    - calls clk_prepare_enable() and registers what is needed in order to
      call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the need of a dedicated function used
with devm_add_action_or_reset().

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230825095612.2972892-1-ruanjinjie@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

3 files changed, 5 insertions, 53 deletions

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 6f9eebd6c7ee..6c390c4eb26d 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -299,11 +299,6 @@ static void ad9832_reg_disable(void *reg)
 	regulator_disable(reg);
 }
 
-static void ad9832_clk_disable(void *clk)
-{
-	clk_disable_unprepare(clk);
-}
-
 static int ad9832_probe(struct spi_device *spi)
 {
 	struct ad9832_platform_data *pdata = dev_get_platdata(&spi->dev);
@@ -350,18 +345,10 @@ static int ad9832_probe(struct spi_device *spi)
 	if (ret)
 		return ret;
 
-	st->mclk = devm_clk_get(&spi->dev, "mclk");
+	st->mclk = devm_clk_get_enabled(&spi->dev, "mclk");
 	if (IS_ERR(st->mclk))
 		return PTR_ERR(st->mclk);
 
-	ret = clk_prepare_enable(st->mclk);
-	if (ret < 0)
-		return ret;
-
-	ret = devm_add_action_or_reset(&spi->dev, ad9832_clk_disable, st->mclk);
-	if (ret)
-		return ret;
-
 	st->spi = spi;
 	mutex_init(&st->lock);
 
diff --git a/drivers/staging/iio/frequency/ad9834.c b/drivers/staging/iio/frequency/ad9834.c
index 285df0e489a6..a7a5cdcc6590 100644
--- a/drivers/staging/iio/frequency/ad9834.c
+++ b/drivers/staging/iio/frequency/ad9834.c
@@ -394,13 +394,6 @@ static void ad9834_disable_reg(void *data)
 	regulator_disable(reg);
 }
 
-static void ad9834_disable_clk(void *data)
-{
-	struct clk *clk = data;
-
-	clk_disable_unprepare(clk);
-}
-
 static int ad9834_probe(struct spi_device *spi)
 {
 	struct ad9834_state *st;
@@ -429,22 +422,12 @@ static int ad9834_probe(struct spi_device *spi)
 	}
 	st = iio_priv(indio_dev);
 	mutex_init(&st->lock);
-	st->mclk = devm_clk_get(&spi->dev, NULL);
+	st->mclk = devm_clk_get_enabled(&spi->dev, NULL);
 	if (IS_ERR(st->mclk)) {
-		ret = PTR_ERR(st->mclk);
-		return ret;
-	}
-
-	ret = clk_prepare_enable(st->mclk);
-	if (ret) {
 		dev_err(&spi->dev, "Failed to enable master clock\n");
-		return ret;
+		return PTR_ERR(st->mclk);
 	}
 
-	ret = devm_add_action_or_reset(&spi->dev, ad9834_disable_clk, st->mclk);
-	if (ret)
-		return ret;
-
 	st->spi = spi;
 	st->devid = spi_get_device_id(spi)->driver_data;
 	indio_dev->name = spi_get_device_id(spi)->name;
diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index 46db6d91542a..e748a5d04e97 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -667,13 +667,6 @@ static void ad5933_reg_disable(void *data)
 	regulator_disable(st->reg);
 }
 
-static void ad5933_clk_disable(void *data)
-{
-	struct ad5933_state *st = data;
-
-	clk_disable_unprepare(st->mclk);
-}
-
 static int ad5933_probe(struct i2c_client *client)
 {
 	const struct i2c_device_id *id = i2c_client_get_device_id(client);
@@ -712,23 +705,12 @@ static int ad5933_probe(struct i2c_client *client)
 
 	st->vref_mv = ret / 1000;
 
-	st->mclk = devm_clk_get(&client->dev, "mclk");
+	st->mclk = devm_clk_get_enabled(&client->dev, "mclk");
 	if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT)
 		return PTR_ERR(st->mclk);
 
-	if (!IS_ERR(st->mclk)) {
-		ret = clk_prepare_enable(st->mclk);
-		if (ret < 0)
-			return ret;
-
-		ret = devm_add_action_or_reset(&client->dev,
-					       ad5933_clk_disable,
-					       st);
-		if (ret)
-			return ret;
-
+	if (!IS_ERR(st->mclk))
 		ext_clk_hz = clk_get_rate(st->mclk);
-	}
 
 	if (ext_clk_hz) {
 		st->mclk_hz = ext_clk_hz;