Re: [PATCH 1/3] iio: adc: meson-saradc: squash and share the common adc platform data

From: Martin Blumenstingl
Date: Fri Mar 30 2018 - 07:07:09 EST

On Mon, Mar 26, 2018 at 10:46 AM, Yixun Lan <yixun.lan@xxxxxxxxxxx> wrote:
> Extract and promote common adc platform data into a new structure,
> to make it better share the info between several SoCs,
> this will avoid duplicating the code all over the place,
> Save a few memory and make the code more maintainable.
>
> Signed-off-by: Yixun Lan <yixun.lan@xxxxxxxxxxx>
Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>

this will also help me when I add support for the internal temperature
sensor (as Meson8b and Meson8m2 share the same settings, except the
name)

> ---
> drivers/iio/adc/meson_saradc.c | 75 +++++++++++++++++++++++-------------------
> 1 file changed, 42 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
> index 29fa7736d80c..799ed929ab99 100644
> --- a/drivers/iio/adc/meson_saradc.c
> +++ b/drivers/iio/adc/meson_saradc.c
> @@ -219,15 +219,19 @@ enum meson_sar_adc_chan7_mux_sel {
> CHAN7_MUX_CH7_INPUT = 0x7,
> };
>
> -struct meson_sar_adc_data {
> +struct meson_sar_adc_param {
> bool has_bl30_integration;
> unsigned long clock_rate;
> u32 bandgap_reg;
> unsigned int resolution;
> - const char *name;
> const struct regmap_config *regmap_config;
> };
>
> +struct meson_sar_adc_data {
> + const struct meson_sar_adc_param *param;
> + const char *name;
> +};
> +
> struct meson_sar_adc_priv {
> struct regmap *regmap;
> struct regulator *vref;
> @@ -276,7 +280,7 @@ 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->resolution) - 1);
> + return clamp(tmp, 0, (1 << priv->data->param->resolution) - 1);
> }
>
> static int meson_sar_adc_wait_busy_clear(struct iio_dev *indio_dev)
> @@ -328,7 +332,7 @@ 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->resolution - 1, 0);
> + fifo_val &= GENMASK(priv->data->param->resolution - 1, 0);
> *val = meson_sar_adc_calib_val(indio_dev, fifo_val);
>
> return 0;
> @@ -447,7 +451,7 @@ static int meson_sar_adc_lock(struct iio_dev *indio_dev)
>
> mutex_lock(&indio_dev->mlock);
>
> - if (priv->data->has_bl30_integration) {
> + if (priv->data->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,
> @@ -473,7 +477,7 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
> {
> struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
>
> - if (priv->data->has_bl30_integration)
> + if (priv->data->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);
> @@ -557,7 +561,7 @@ static int meson_sar_adc_iio_info_read_raw(struct iio_dev *indio_dev,
> }
>
> *val = ret / 1000;
> - *val2 = priv->data->resolution;
> + *val2 = priv->data->param->resolution;
> return IIO_VAL_FRACTIONAL_LOG2;
>
> case IIO_CHAN_INFO_CALIBBIAS:
> @@ -630,7 +634,7 @@ 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->has_bl30_integration) {
> + if (priv->data->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
> @@ -710,7 +714,7 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
> return ret;
> }
>
> - ret = clk_set_rate(priv->adc_clk, priv->data->clock_rate);
> + ret = clk_set_rate(priv->adc_clk, priv->data->param->clock_rate);
> if (ret) {
> dev_err(indio_dev->dev.parent,
> "failed to set adc clock rate\n");
> @@ -723,14 +727,15 @@ 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;
> u32 enable_mask;
>
> - if (priv->data->bandgap_reg == MESON_SAR_ADC_REG11)
> + if (param->bandgap_reg == MESON_SAR_ADC_REG11)
> enable_mask = MESON_SAR_ADC_REG11_BANDGAP_EN;
> else
> enable_mask = MESON_SAR_ADC_DELTA_10_TS_VBG_EN;
>
> - regmap_update_bits(priv->regmap, priv->data->bandgap_reg, enable_mask,
> + regmap_update_bits(priv->regmap, param->bandgap_reg, enable_mask,
> on_off ? enable_mask : 0);
> }
>
> @@ -842,8 +847,8 @@ 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->resolution) / 4;
> - nominal1 = (1 << priv->data->resolution) * 3 / 4;
> + nominal0 = (1 << priv->data->param->resolution) / 4;
> + nominal1 = (1 << priv->data->param->resolution) * 3 / 4;
>
> meson_sar_adc_set_chan7_mux(indio_dev, CHAN7_MUX_VDD_DIV4);
> usleep_range(10, 20);
> @@ -881,48 +886,52 @@ static const struct iio_info meson_sar_adc_iio_info = {
> .read_raw = meson_sar_adc_iio_info_read_raw,
> };
>
> -static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
> - .has_bl30_integration = false,
> - .clock_rate = 1150000,
> - .bandgap_reg = MESON_SAR_ADC_DELTA_10,
> - .regmap_config = &meson_sar_adc_regmap_config_meson8,
> - .resolution = 10,
> - .name = "meson-meson8-saradc",
> -};
> -
> -static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = {
> +static const struct meson_sar_adc_param meson_sar_adc_meson8_param = {
> .has_bl30_integration = false,
> .clock_rate = 1150000,
> .bandgap_reg = MESON_SAR_ADC_DELTA_10,
> .regmap_config = &meson_sar_adc_regmap_config_meson8,
> .resolution = 10,
> - .name = "meson-meson8b-saradc",
> };
>
> -static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = {
> +static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = {
> .has_bl30_integration = true,
> .clock_rate = 1200000,
> .bandgap_reg = MESON_SAR_ADC_REG11,
> .regmap_config = &meson_sar_adc_regmap_config_gxbb,
> .resolution = 10,
> - .name = "meson-gxbb-saradc",
> };
>
> -static const struct meson_sar_adc_data meson_sar_adc_gxl_data = {
> +static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
> .has_bl30_integration = true,
> .clock_rate = 1200000,
> .bandgap_reg = MESON_SAR_ADC_REG11,
> .regmap_config = &meson_sar_adc_regmap_config_gxbb,
> .resolution = 12,
> +};
> +
> +static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
> + .param = &meson_sar_adc_meson8_param,
> + .name = "meson-meson8-saradc",
> +};
> +
> +static const struct meson_sar_adc_data meson_sar_adc_meson8b_data = {
> + .param = &meson_sar_adc_meson8_param,
> + .name = "meson-meson8b-saradc",
> +};
> +
> +static const struct meson_sar_adc_data meson_sar_adc_gxbb_data = {
> + .param = &meson_sar_adc_gxbb_param,
> + .name = "meson-gxbb-saradc",
> +};
> +
> +static const struct meson_sar_adc_data meson_sar_adc_gxl_data = {
> + .param = &meson_sar_adc_gxl_param,
> .name = "meson-gxl-saradc",
> };
>
> static const struct meson_sar_adc_data meson_sar_adc_gxm_data = {
> - .has_bl30_integration = true,
> - .clock_rate = 1200000,
> - .bandgap_reg = MESON_SAR_ADC_REG11,
> - .regmap_config = &meson_sar_adc_regmap_config_gxbb,
> - .resolution = 12,
> + .param = &meson_sar_adc_gxl_param,
> .name = "meson-gxm-saradc",
> };
>
> @@ -999,7 +1008,7 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
> return ret;
>
> priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
> - priv->data->regmap_config);
> + priv->data->param->regmap_config);
> if (IS_ERR(priv->regmap))
> return PTR_ERR(priv->regmap);
>
> --
> 2.15.1
>