[PATCH v3 3/6] adc: meson-saradc: skip hardware init only if ADC is enabled

[Marek Szyprowski]

The driver skips hardware initialization if it is already configured by
the earlier bootloader stage (BL30). Skip the initialization only if the
hardware is really initialized and enabled.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>
Tested-by: Jaehoon Chung <jh80.chung at samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>
---
 drivers/adc/meson-saradc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/adc/meson-saradc.c b/drivers/adc/meson-saradc.c
index 998cef24d8..ce7ae990ad 100644
--- a/drivers/adc/meson-saradc.c
+++ b/drivers/adc/meson-saradc.c
@@ -512,8 +512,11 @@ static int meson_saradc_init(struct meson_saradc_priv *priv)
 	 * reading the temperature sensor.
 	 */
 	regmap_read(priv->regmap, MESON_SAR_ADC_REG3, &regval);
-	if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED)
-		return 0;
+	if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) {
+		regmap_read(priv->regmap, MESON_SAR_ADC_REG3, &regval);
+		if (regval & MESON_SAR_ADC_REG3_ADC_EN)
+			return 0;
+	}
 
 	meson_saradc_stop_sample_engine(priv);
 
-- 
2.17.1