iio: adc: cf_axi_adc: Add support for axi additional channel

In some projects (e.g. ADI-FMCLIDAR1), a dedicated IIO buffer channel should be used for displaying additional data (for ADI-FMCLIDAR1, the information about the enabled sequencer channels). Signed-off-by: Dragos Bogdan <[email protected]>
analogdevicesinc · Sep 5, 2019 · 98df3f0 · 98df3f0
1 parent 8ace87d
commit 98df3f0
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diff --git a/drivers/iio/adc/cf_axi_adc.h b/drivers/iio/adc/cf_axi_adc.h
@@ -205,6 +205,7 @@ struct axiadc_state {
 	bool				dp_disable;
 	unsigned long long		adc_clk;
 	unsigned			have_slave_channels;
+	bool				additional_channel;
 
 	struct iio_hw_consumer		*frontend;
 

diff --git a/drivers/iio/adc/cf_axi_adc_core.c b/drivers/iio/adc/cf_axi_adc_core.c
@@ -640,6 +640,13 @@ static int axiadc_channel_setup(struct iio_dev *indio_dev,
 	for (i = 0, cnt = 0; i < adc_chan_num; i++)
 		st->channels[cnt++] = adc_channels[i];
 
+	if (st->additional_channel && cnt < AXIADC_MAX_CHANNEL) {
+		st->channels[cnt] = adc_channels[0];
+		st->channels[cnt].channel = cnt;
+		st->channels[cnt].scan_index = cnt;
+		cnt++;
+	}
+
 	for (i = 0; i < st->max_usr_channel; i++) {
 		usr_ctrl = axiadc_read(st, ADI_REG_CHAN_USR_CNTRL_1(cnt));
 		st->channels[cnt].type = IIO_VOLTAGE;
@@ -819,6 +826,9 @@ static int axiadc_probe(struct platform_device *pdev)
 		}
 	}
 
+	st->additional_channel = of_property_read_bool(pdev->dev.of_node,
+		"adi,axi-additional-channel-available");
+
 	/* Reset all HDL Cores */
 	axiadc_write(st, ADI_REG_RSTN, 0);
 	mdelay(10);