Hello, There is an ADC driver following the IIO framework. I am using Kernel 3.17 rc5 in an embedded device. I am in the process of writing a "consumer" IIO touchscreen driver which uses the ADC channels. http://lxr.free-electrons.com/source/Documentation/devicetree/bindings/iio/iio-bindings.txt I am following this document and my device tree node is as follows for the touchscreen driver. vf_touchctrl { compatible = "vf-touch"; io-channels = "&adc0 0", &adc0 1", "&adc1 0", "&adc1 2"; pinctrl-names = "idle", "default"; pinctrl-0 = "&pinctrl_default"; pinctrl-1 = "&pinctrl_idle"; gpio-xp = "&gpio0 8 0" .... /* Few more gpio entries like this */ }; In the touchscreen driver, i will be using the IIO consumer functions from http://lxr.free-electrons.com/source/include/linux/iio/consumer.h. When i call iio_channel_get_all(), i am expecting to get pointers to the four channels in order specified in the DT above. Is my understanding correct? Then specify these four channel pointers with iio_read_channel_raw() to get the ADC readings. My other question is related to the GPIO entry in the DT above. When using of_get_named_gpio(), i do it like below. int ret = of_get_named_gpio(node, "gpio-xp", 0); I do not get the correct values, but negative error values. Also, i can see a "argument longer than property" error for the device tree parsing in dmesg log. Can someone point out what i am doing wrong here? Thanks & Regards, Victor aka Sanchayan. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
