diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index e09233b03c05..609676384f5e 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -64,7 +64,7 @@
 #define STM32H7_CKMODE_MASK		GENMASK(17, 16)
 
 /* STM32 H7 maximum analog clock rate (from datasheet) */
-#define STM32H7_ADC_MAX_CLK_RATE	72000000
+#define STM32H7_ADC_MAX_CLK_RATE	36000000
 
 /**
  * stm32_adc_common_regs - stm32 common registers, compatible dependent data
@@ -148,14 +148,14 @@ static int stm32f4_adc_clk_sel(struct platform_device *pdev,
 		return -EINVAL;
 	}
 
-	priv->common.rate = rate;
+	priv->common.rate = rate / stm32f4_pclk_div[i];
 	val = readl_relaxed(priv->common.base + STM32F4_ADC_CCR);
 	val &= ~STM32F4_ADC_ADCPRE_MASK;
 	val |= i << STM32F4_ADC_ADCPRE_SHIFT;
 	writel_relaxed(val, priv->common.base + STM32F4_ADC_CCR);
 
 	dev_dbg(&pdev->dev, "Using analog clock source at %ld kHz\n",
-		rate / (stm32f4_pclk_div[i] * 1000));
+		priv->common.rate / 1000);
 
 	return 0;
 }
@@ -250,7 +250,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev,
 
 out:
 	/* rate used later by each ADC instance to control BOOST mode */
-	priv->common.rate = rate;
+	priv->common.rate = rate / div;
 
 	/* Set common clock mode and prescaler */
 	val = readl_relaxed(priv->common.base + STM32H7_ADC_CCR);
@@ -260,7 +260,7 @@ out:
 	writel_relaxed(val, priv->common.base + STM32H7_ADC_CCR);
 
 	dev_dbg(&pdev->dev, "Using %s clock/%d source at %ld kHz\n",
-		ckmode ? "bus" : "adc", div, rate / (div * 1000));
+		ckmode ? "bus" : "adc", div, priv->common.rate / 1000);
 
 	return 0;
 }