diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/meson_saradc.c | 80 |
1 files changed, 56 insertions, 24 deletions
diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c index 2f6fec995264..81cd39a57fe3 100644 --- a/drivers/iio/adc/meson_saradc.c +++ b/drivers/iio/adc/meson_saradc.c @@ -220,6 +220,7 @@ enum meson_sar_adc_chan7_mux_sel { }; struct meson_sar_adc_data { + bool has_bl30_integration; unsigned int resolution; const char *name; }; @@ -437,19 +438,24 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev) mutex_lock(&indio_dev->mlock); - /* prevent BL30 from using the SAR ADC while we are using it */ - regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, - MESON_SAR_ADC_DELAY_KERNEL_BUSY, - MESON_SAR_ADC_DELAY_KERNEL_BUSY); - - /* wait until BL30 releases it's lock (so we can use the SAR ADC) */ - do { - udelay(1); - regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val); - } while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--); - - if (timeout < 0) - return -ETIMEDOUT; + if (priv->data->has_bl30_integration) { + /* prevent BL30 from using the SAR ADC while we are using it */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY); + + /* + * wait until BL30 releases it's lock (so we can use the SAR + * ADC) + */ + do { + udelay(1); + regmap_read(priv->regmap, MESON_SAR_ADC_DELAY, &val); + } while (val & MESON_SAR_ADC_DELAY_BL30_BUSY && timeout--); + + if (timeout < 0) + return -ETIMEDOUT; + } return 0; } @@ -458,9 +464,10 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev) { struct meson_sar_adc_priv *priv = iio_priv(indio_dev); - /* allow BL30 to use the SAR ADC again */ - regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, - MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); + if (priv->data->has_bl30_integration) + /* allow BL30 to use the SAR ADC again */ + regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELAY, + MESON_SAR_ADC_DELAY_KERNEL_BUSY, 0); mutex_unlock(&indio_dev->mlock); } @@ -614,14 +621,16 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev) */ meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); - /* - * leave sampling delay and the input clocks as configured by BL30 to - * make sure BL30 gets the values it expects when reading the - * temperature sensor. - */ - regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); - if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) - return 0; + if (priv->data->has_bl30_integration) { + /* + * leave sampling delay and the input clocks as configured by + * BL30 to make sure BL30 gets the values it expects when + * reading the temperature sensor. + */ + regmap_read(priv->regmap, MESON_SAR_ADC_REG3, ®val); + if (regval & MESON_SAR_ADC_REG3_BL30_INITIALIZED) + return 0; + } meson_sar_adc_stop_sample_engine(indio_dev); @@ -834,23 +843,46 @@ static const struct iio_info meson_sar_adc_iio_info = { .driver_module = THIS_MODULE, }; +static const struct meson_sar_adc_data meson_sar_adc_meson8_data = { + .has_bl30_integration = false, + .resolution = 10, + .name = "meson-meson8-saradc", +}; + +static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = { + .has_bl30_integration = false, + .resolution = 10, + .name = "meson-meson8b-saradc", +}; + static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = { + .has_bl30_integration = true, .resolution = 10, .name = "meson-gxbb-saradc", }; static const struct meson_sar_adc_data meson_sar_adc_gxl_data = { + .has_bl30_integration = true, .resolution = 12, .name = "meson-gxl-saradc", }; static const struct meson_sar_adc_data meson_sar_adc_gxm_data = { + .has_bl30_integration = true, .resolution = 12, .name = "meson-gxm-saradc", }; static const struct of_device_id meson_sar_adc_of_match[] = { { + .compatible = "amlogic,meson8-saradc", + .data = &meson_sar_adc_meson8_data, + }, + { + .compatible = "amlogic,meson8b-saradc", + .data = &meson_sar_adc_meson8b_data, + }, + { .compatible = "amlogic,meson-gxbb-saradc", .data = &meson_sar_adc_gxbb_data, }, { |
