On Fri, Oct 4, 2019 at 8:35 AM Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote: > > Currently, GPIO LED driver allows the GPIO properties to contain one GPIO > phandle. This enables to contain more than one GPIO phandle and the > brightness of the LEDs is proportional to the number of active GPIOs. > > Describing multi-level brightness GPIO LED is only supported in DT. It is > not supported in ACPI and platform data. > This looks interesting. I have a half-baked driver for the NXP PCA9956B; which is a 24-channel LED driver, each channel with brightness control. With these LEDs mounted in a line (like on my devboard), an interface for setting e.g. a percentage and have the appropriate number of LEDs light up seems like an interesting thing to pursue. So I think this would be better represented in some more generic form, perhaps a trigger? Regards, Bjorn
