iio: adc: meson-saradc: simplify access to meson_sar_adc_param

Commit 053ffe3c ("iio: adc: meson-saradc: squash and share the
common adc platform data") put all the data which is needed at runtime
from struct meson_sar_adc_data to a new struct meson_sar_adc_param so
we can re-use the platform specific configuration without having to
duplicate everything just to change the name.

The only place where struct meson_sar_adc_data is now needed is the
_probe function which has to pass the name to the iio_dev. All other
functions only need access to struct meson_sar_adc_param. This means we
can simplify struct meson_sar_adc_priv.

The goal of this patch is to make the code a bit easier to read since
this removes one level of nesting. No functional changes intended.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/meson_saradc.c

@@ -234,7 +234,7 @@ struct meson_sar_adc_data {
 struct meson_sar_adc_priv {
 	struct regmap				*regmap;
 	struct regulator			*vref;
-	const struct meson_sar_adc_data		*data;
+	const struct meson_sar_adc_param	*param;
 	struct clk				*clkin;
 	struct clk				*core_clk;
 	struct clk				*adc_sel_clk;
@@ -279,7 +279,7 @@ static int meson_sar_adc_calib_val(struct iio_dev *indio_dev, int val)
 	/* use val_calib = scale * val_raw + offset calibration function */
 	tmp = div_s64((s64)val * priv->calibscale, MILLION) + priv->calibbias;
 
-	return clamp(tmp, 0, (1 << priv->data->param->resolution) - 1);
+	return clamp(tmp, 0, (1 << priv->param->resolution) - 1);
 }
 
 static int meson_sar_adc_wait_busy_clear(struct iio_dev *indio_dev)
@@ -331,7 +331,7 @@ static int meson_sar_adc_read_raw_sample(struct iio_dev *indio_dev,
 	}
 
 	fifo_val = FIELD_GET(MESON_SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, regval);
-	fifo_val &= GENMASK(priv->data->param->resolution - 1, 0);
+	fifo_val &= GENMASK(priv->param->resolution - 1, 0);
 	*val = meson_sar_adc_calib_val(indio_dev, fifo_val);
 
 	return 0;
@@ -450,7 +450,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev)
 
 	mutex_lock(&indio_dev->mlock);
 
-	if (priv->data->param->has_bl30_integration) {
+	if (priv->param->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,
@@ -478,7 +478,7 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 
-	if (priv->data->param->has_bl30_integration)
+	if (priv->param->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);
@@ -562,7 +562,7 @@ static int meson_sar_adc_iio_info_read_raw(struct iio_dev *indio_dev,
 		}
 
 		*val = ret / 1000;
-		*val2 = priv->data->param->resolution;
+		*val2 = priv->param->resolution;
 		return IIO_VAL_FRACTIONAL_LOG2;
 
 	case IIO_CHAN_INFO_CALIBBIAS:
@@ -635,7 +635,7 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
 	 */
 	meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_CH7_INPUT);
 
-	if (priv->data->param->has_bl30_integration) {
+	if (priv->param->has_bl30_integration) {
 		/*
 		 * leave sampling delay and the input clocks as configured by
 		 * BL30 to make sure BL30 gets the values it expects when
@@ -715,7 +715,7 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
 		return ret;
 	}
 
-	ret = clk_set_rate(priv->adc_clk, priv->data->param->clock_rate);
+	ret = clk_set_rate(priv->adc_clk, priv->param->clock_rate);
 	if (ret) {
 		dev_err(indio_dev->dev.parent,
 			"failed to set adc clock rate\n");
@@ -728,7 +728,7 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
 static void meson_sar_adc_set_bandgap(struct iio_dev *indio_dev, bool on_off)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
-	const struct meson_sar_adc_param *param = priv->data->param;
+	const struct meson_sar_adc_param *param = priv->param;
 	u32 enable_mask;
 
 	if (param->bandgap_reg == MESON_SAR_ADC_REG11)
@@ -848,8 +848,8 @@ static int meson_sar_adc_calib(struct iio_dev *indio_dev)
 	int ret, nominal0, nominal1, value0, value1;
 
 	/* use points 25% and 75% for calibration */
-	nominal0 = (1 << priv->data->param->resolution) / 4;
-	nominal1 = (1 << priv->data->param->resolution) * 3 / 4;
+	nominal0 = (1 << priv->param->resolution) / 4;
+	nominal1 = (1 << priv->param->resolution) * 3 / 4;
 
 	meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_DIV4);
 	usleep_range(10, 20);
@@ -1000,9 +1000,9 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	priv->data = match_data;
+	priv->param = match_data->param;
 
-	indio_dev->name = priv->data->name;
+	indio_dev->name = match_data->name;
 	indio_dev->dev.parent = &pdev->dev;
 	indio_dev->dev.of_node = pdev->dev.of_node;
 	indio_dev->modes = INDIO_DIRECT_MODE;
@@ -1026,7 +1026,7 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
 		return ret;
 
 	priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
-					     priv->data->param->regmap_config);
+					     priv->param->regmap_config);
 	if (IS_ERR(priv->regmap))
 		return PTR_ERR(priv->regmap);