iio: adc: ad4080: add support for AD4081

Add support for AD4081 20-bit SAR ADC. The AD4081 has the same
resolution as AD4080 (20-bit) but differs in LVDS CNV clock count
maximum (2 vs 7).

Changes:
- Add AD4081_CHIP_ID definition (0x0051)
- Create ad4081_channel with 20-bit resolution and 32-bit storage
- Add ad4081_chip_info with lvds_cnv_clk_cnt_max = 2
- Register AD4081 in device ID and OF match tables

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 d243b4336ac62e4ad8c23562835cdf3748dcc12e..5940651655dfd89622e0a9d240f2c431ad122392 100644 (file)
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -126,6 +126,7 @@
 /* Miscellaneous Definitions */
 #define AD4080_SPI_READ                                                BIT(7)
 #define AD4080_CHIP_ID                                         0x0050
+#define AD4081_CHIP_ID                                         0x0051
 #define AD4084_CHIP_ID                                         0x0054
 
 #define AD4080_LVDS_CNV_CLK_CNT_MAX                            7
@@ -436,6 +437,8 @@ static struct iio_chan_spec_ext_info ad4080_ext_info[] = {
 
 static const struct iio_chan_spec ad4080_channel = AD4080_CHANNEL_DEFINE(20, 32);
 
+static const struct iio_chan_spec ad4081_channel = AD4080_CHANNEL_DEFINE(20, 32);
+
 static const struct iio_chan_spec ad4084_channel = AD4080_CHANNEL_DEFINE(16, 16);
 
 static const struct ad4080_chip_info ad4080_chip_info = {
@@ -448,6 +451,16 @@ static const struct ad4080_chip_info ad4080_chip_info = {
        .lvds_cnv_clk_cnt_max = AD4080_LVDS_CNV_CLK_CNT_MAX,
 };
 
+static const struct ad4080_chip_info ad4081_chip_info = {
+       .name = "ad4081",
+       .product_id = AD4081_CHIP_ID,
+       .scale_table = ad4080_scale_table,
+       .num_scales = ARRAY_SIZE(ad4080_scale_table),
+       .num_channels = 1,
+       .channels = &ad4081_channel,
+       .lvds_cnv_clk_cnt_max = 2,
+};
+
 static const struct ad4080_chip_info ad4084_chip_info = {
        .name = "ad4084",
        .product_id = AD4084_CHIP_ID,
@@ -613,6 +626,7 @@ static int ad4080_probe(struct spi_device *spi)
 
 static const struct spi_device_id ad4080_id[] = {
        { "ad4080", (kernel_ulong_t)&ad4080_chip_info },
+       { "ad4081", (kernel_ulong_t)&ad4081_chip_info },
        { "ad4084", (kernel_ulong_t)&ad4084_chip_info },
        { }
 };
@@ -620,6 +634,7 @@ MODULE_DEVICE_TABLE(spi, ad4080_id);
 
 static const struct of_device_id ad4080_of_match[] = {
        { .compatible = "adi,ad4080", &ad4080_chip_info },
+       { .compatible = "adi,ad4081", &ad4081_chip_info },
        { .compatible = "adi,ad4084", &ad4084_chip_info },
        { }
 };