2016-12-10 19:17 GMT+01:00 Jonathan Cameron <jic23@xxxxxxxxxx>: > On 06/12/16 11:12, Bartosz Golaszewski wrote: >> >> I wrote the initial patch quickly and didn't give it much of a >> thought. Now I realized I completely missed the point and managed to >> confuse everybody - myself included. >> >> So the problem we have is not power-cycling the adc - it's >> power-cycling the device connected to a probe on which there's an adc. >> What I was trying to do was adding support for the power-switch on >> baylibre-acme[1] probes. >> >> For example: we have a USB probe on which the VBUS signal goes through >> a power load switch and than through the adc. The adc (in this case >> ina226) is always powered on, while the fixed regulator I wanted to >> enable/disable actually drives the power switch to cut/restore power >> to the connected USB device i.e. there's no real regulator - just a >> GPIO driving the power switch. >> >> A typical use case is measuring the power consumption of development >> boards[2]. Rebooting them remotely using acme probes is already done, >> but we're using the obsolete /sys/class/gpio interface. >> >> We're already using libiio to read the measured data from the power >> monitor, that's why we'd like to use the iio framework for >> power-cycling the devices as well. My question is: would bridging the >> regulator framework be the right solution? Should we look for >> something else? Bridge the GPIO framework instead? > > Definitely doesn't fit inside standard scope of IIO - though I can see > why you were thinking along these lines. > Well, it's industrial INPUT/output right? I guess we can consider power-cycling input in this case. :) In our particular use case, the main reason for using IIO is having a single interface (libiio) instead of introducing a new one just for that (in the form of random sysfs attributes for example), but I'm sure such power switches could find application elsewhere too (measuring temperature, while power-cycling some cooling mechanism is the first thing that comes to mind). > Mark Brown, any thoughts? > > Effectively we are are looking at something that (in general form) might > be the equivalent of controlling a lab bench supply... So regulators > at the edge of the known world, with no visibility of what lies beyond. > Please consider the two patches I just sent. Instead of regulators, they add DT bindings for gpio power switches and introduce a simple iio driver using the gpio consumer API. Best regards, Bartosz Golaszewski -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
