Re: [PATCH v5 3/5] iio: adc: ad7949: add support for internal vref

On Fri, Aug 13, 2021 at 11:51 PM Liam Beguin [off-list ref] wrote:

On Mon Aug 9, 2021 at 3:42 PM EDT, Jonathan Cameron wrote:

...

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+       /* Read channel specific information form the devicetree */

from

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+       device_for_each_child_node(dev, child) {
+               ret = fwnode_property_read_u32(child, "reg", &i);
+               if (ret) {
+                       dev_err(dev, "missing reg property in %pfw\n", child);
+                       fwnode_handle_put(child);
+                       return ret;
+               }
+
+               ad7949_chan = &ad7949_adc->channels[i];
+
+               ret = fwnode_property_read_u32(child, "adi,internal-ref-microvolt", &tmp);
+               if (ret < 0 && ret != -EINVAL) {
+                       dev_err(dev, "invalid internal reference in %pfw\n", child);
+                       fwnode_handle_put(child);
+                       return ret;
+               }

After getting access to another setup to run more tests, I noticed
that setting the reference per channel isn't really feasible.

Is it a hardware limitation?

-- 
With Best Regards,
Andy Shevchenko