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Date: Tue, 5 Sep 2017 17:16:29 -0400 (EDT) From: Dimitry Ishenko <dimitry@....flag.org> To: linux-kernel@...r.kernel.org Subject: [PATCH v12 1/5] Input: goodix - add sysfs interface to dump config > On Saturday, September 10, 2016 at 2:00:06 PM UTC-4, Irina Tirdea wrote: > > Goodix devices have a configuration information register area that > specifies various parameters for the device. ... > > Export a sysfs interface that would allow reading the configuration > information. ... > > This sysfs interface will be exported only if the gpio pins are properly > initialized from ACPI/DT. ... Irina, why the requirement for INT/RST gpio pins? The config info is available by simply reading from the config register (0x8047) and IIUIC does not require presence of INT/RST pins. So, it can be exported even without those pins. Likewise, config writing support currently present in the kernel (which I believe you are responsible for [thank you!]) also for some reason mandates presence of INT/RST. However, it is simply done by writing to the aforementioned config register (0x8047). I have 2 similar devices (Pipo X8 and X9) with GT911 chips that have different configs. Neither device has the RST pin defined. I was able to successfully read the config from one device and write it to the other. So, it seems the INT/RST requirement is not necessary for config reading/writing support. Or did I miss something. Thank you. Dimitry NB: I am not subscribed to the list. Please CC me directly with any replies.
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