Hi Andrew, On Thu Jun 18 2020, Andrew Lunn wrote: > On Thu, Jun 18, 2020 at 08:40:27AM +0200, Kurt Kanzenbach wrote: >> The switch has two controllable I/Os which are usually connected to LEDs. This >> is useful to immediately visually see the PTP status. >> >> These provide two signals: >> >> * is_gm >> >> This LED can be activated if the current device is the grand master in that >> PTP domain. >> >> * sync_good >> >> This LED can be activated if the current device is in sync with the network >> time. >> >> Expose these via the LED framework to be controlled via user space >> e.g. linuxptp. > > Hi Kurt > > Is the hardware driving these signals at all? Or are these just > suggested names in the documentation? It would not be an issue to have > user space to configure them to use the heartbeat trigger, etc? These are more like GPIOs. If a 1 is set into the register then the hardware drives the signal to high. The names are from the documentation: * sync_good: This signal indicates that the switch is in sync * is_gm: This signal indicates that the switch is the grand master However, these signals have to be set by user space. Most likely these signals are connected to LEDs. Thanks, Kurt
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