Hello, Any pointers?. Regards, Sanchayan. On Sat, Sep 27, 2014 at 12:24 PM, sanchayan maity <victorascroft@xxxxxxxxx> wrote: > 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
