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adc: meson-saradc: skip hardware init only if ADC is enabled

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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@samsung.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Marek Szyprowski 2020-12-16 08:51:55 +01:00 committed by Neil Armstrong
parent 220992bde8
commit 81b1c47596
1 changed files with 5 additions and 2 deletions
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7
drivers/adc/meson-saradc.c
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@ -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);