#define AD7124_CONFIG_REF_SEL(x) FIELD_PREP(AD7124_CONFIG_REF_SEL_MSK, x)
#define AD7124_CONFIG_PGA_MSK GENMASK(2, 0)
#define AD7124_CONFIG_PGA(x) FIELD_PREP(AD7124_CONFIG_PGA_MSK, x)
+#define AD7124_CONFIG_IN_BUFF_MSK GENMASK(7, 6)
+#define AD7124_CONFIG_IN_BUFF(x) FIELD_PREP(AD7124_CONFIG_IN_BUFF_MSK, x)
/* AD7124_FILTER_X */
#define AD7124_FILTER_FS_MSK GENMASK(10, 0)
struct ad7124_channel_config {
enum ad7124_ref_sel refsel;
bool bipolar;
+ bool buf_positive;
+ bool buf_negative;
unsigned int ain;
unsigned int vref_mv;
unsigned int pga_bits;
else
st->channel_config[channel].refsel = tmp;
+ st->channel_config[channel].buf_positive =
+ of_property_read_bool(child, "adi,buffered-positive");
+ st->channel_config[channel].buf_negative =
+ of_property_read_bool(child, "adi,buffered-negative");
+
*chan = ad7124_channel_template;
chan->address = channel;
chan->scan_index = channel;
static int ad7124_setup(struct ad7124_state *st)
{
unsigned int val, fclk, power_mode;
- int i, ret;
+ int i, ret, tmp;
fclk = clk_get_rate(st->mclk);
if (!fclk)
if (ret < 0)
return ret;
+ tmp = (st->channel_config[i].buf_positive << 1) +
+ st->channel_config[i].buf_negative;
+
val = AD7124_CONFIG_BIPOLAR(st->channel_config[i].bipolar) |
- AD7124_CONFIG_REF_SEL(st->channel_config[i].refsel);
+ AD7124_CONFIG_REF_SEL(st->channel_config[i].refsel) |
+ AD7124_CONFIG_IN_BUFF(tmp);
ret = ad_sd_write_reg(&st->sd, AD7124_CONFIG(i), 2, val);
if (ret < 0)
return ret;