iio: adc: meson: fix core clock enable/disable moment

Enable core clock at probe stage and disable it at remove stage.
Core clock is responsible for turning on/off the entire SoC module so
it should be on before the first module register is touched and be off
at very last moment.

Fixes: 3adbf3427330 ("iio: adc: add a driver for the SAR ADC found in Amlogic Meson SoCs")
Signed-off-by: George Stark <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Cc: <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/meson_saradc.c

···
 		goto err_vref;
 	}
 
-	ret = clk_prepare_enable(priv->core_clk);
-	if (ret) {
-		dev_err(dev, "failed to enable core clk\n");
-		goto err_core_clk;
-	}
-
 	regval = FIELD_PREP(MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, 1);
 	regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG0,
 			   MESON_SAR_ADC_REG0_FIFO_CNT_IRQ_MASK, regval);
···
 	regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3,
 			   MESON_SAR_ADC_REG3_ADC_EN, 0);
 	meson_sar_adc_set_bandgap(indio_dev, false);
-	clk_disable_unprepare(priv->core_clk);
-err_core_clk:
 	regulator_disable(priv->vref);
 err_vref:
 	meson_sar_adc_unlock(indio_dev);
···
 			   MESON_SAR_ADC_REG3_ADC_EN, 0);
 
 	meson_sar_adc_set_bandgap(indio_dev, false);
-
-	clk_disable_unprepare(priv->core_clk);
 
 	regulator_disable(priv->vref);
 
···
 	if (IS_ERR(priv->clkin))
 		return dev_err_probe(dev, PTR_ERR(priv->clkin), "failed to get clkin\n");
 
-	priv->core_clk = devm_clk_get(dev, "core");
+	priv->core_clk = devm_clk_get_enabled(dev, "core");
 	if (IS_ERR(priv->core_clk))
 		return dev_err_probe(dev, PTR_ERR(priv->core_clk), "failed to get core clk\n");
 
···
 static int meson_sar_adc_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 
 	meson_sar_adc_hw_disable(indio_dev);
+
+	clk_disable_unprepare(priv->core_clk);
 
 	return 0;
 }
···
 static int meson_sar_adc_resume(struct device *dev)
 {
 	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
+	int ret;
+
+	ret = clk_prepare_enable(priv->core_clk);
+	if (ret) {
+		dev_err(dev, "failed to enable core clk\n");
+		return ret;
+	}
 
 	return meson_sar_adc_hw_enable(indio_dev);
 }