iio: adc: ad4080: prepare driver for multi-part support

Refactor the ad4080 driver to support multiple ADC variants with
different resolution bits and LVDS CNV clock count maximums.

Changes:
- Add lvds_cnv_clk_cnt_max field to chip_info structure
- Create AD4080_CHANNEL_DEFINE macro for variable resolution/storage bits
- Make LVDS CNV clock count configurable per chip variant
- Use chip_info->product_id for chip identification comparison

This prepares the infrastructure for adding support for additional
ADC parts with different specifications while maintaining backward
compatibility with existing AD4080 functionality.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c
index e15310fcd21a36d79de5fd6fd6950b4260889df2..646a4de01ca701ce389eb4f26ea6b2ff8a72c3f2 100644 (file)
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -167,6 +167,7 @@ struct ad4080_chip_info {
        const unsigned int (*scale_table)[2];
        const struct iio_chan_spec *channels;
        unsigned int num_channels;
+       unsigned int lvds_cnv_clk_cnt_max;
 };
 
 struct ad4080_state {
@@ -414,23 +415,25 @@ static struct iio_chan_spec_ext_info ad4080_ext_info[] = {
        { }
 };
 
-static const struct iio_chan_spec ad4080_channel = {
-       .type = IIO_VOLTAGE,
-       .indexed = 1,
-       .channel = 0,
-       .info_mask_separate = BIT(IIO_CHAN_INFO_SCALE),
-       .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
-                       BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
-       .info_mask_shared_by_all_available =
-                       BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
-       .ext_info = ad4080_ext_info,
-       .scan_index = 0,
-       .scan_type = {
-               .sign = 's',
-               .realbits = 20,
-               .storagebits = 32,
-       },
-};
+#define AD4080_CHANNEL_DEFINE(bits, storage) {                         \
+       .type = IIO_VOLTAGE,                                            \
+       .indexed = 1,                                                   \
+       .channel = 0,                                                   \
+       .info_mask_separate = BIT(IIO_CHAN_INFO_SCALE),                 \
+       .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |       \
+                       BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),          \
+       .info_mask_shared_by_all_available =                            \
+                       BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),          \
+       .ext_info = ad4080_ext_info,                                    \
+       .scan_index = 0,                                                \
+       .scan_type = {                                                  \
+               .sign = 's',                                            \
+               .realbits = (bits),                                     \
+               .storagebits = (storage),                               \
+       },                                                              \
+}
+
+static const struct iio_chan_spec ad4080_channel = AD4080_CHANNEL_DEFINE(20, 32);
 
 static const struct ad4080_chip_info ad4080_chip_info = {
        .name = "ad4080",
@@ -439,6 +442,7 @@ static const struct ad4080_chip_info ad4080_chip_info = {
        .num_scales = ARRAY_SIZE(ad4080_scale_table),
        .num_channels = 1,
        .channels = &ad4080_channel,
+       .lvds_cnv_clk_cnt_max = AD4080_LVDS_CNV_CLK_CNT_MAX,
 };
 
 static int ad4080_setup(struct iio_dev *indio_dev)
@@ -465,7 +469,7 @@ static int ad4080_setup(struct iio_dev *indio_dev)
                return ret;
 
        id = le16_to_cpu(id_le);
-       if (id != AD4080_CHIP_ID)
+       if (id != st->info->product_id)
                dev_info(dev, "Unrecognized CHIP_ID 0x%X\n", id);
 
        ret = regmap_set_bits(st->regmap, AD4080_REG_GPIO_CONFIG_A,
@@ -491,7 +495,7 @@ static int ad4080_setup(struct iio_dev *indio_dev)
                                 AD4080_REG_ADC_DATA_INTF_CONFIG_B,
                                 AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK,
                                 FIELD_PREP(AD4080_ADC_DATA_INTF_CONFIG_B_LVDS_CNV_CLK_CNT_MSK,
-                                           AD4080_LVDS_CNV_CLK_CNT_MAX));
+                                           st->info->lvds_cnv_clk_cnt_max));
        if (ret)
                return ret;