On 11.8.2017 15:54, Edgar E. Iglesias wrote: > On Fri, Aug 11, 2017 at 02:58:03PM +0200, Michal Simek wrote: >> Hi Rob, +Edgar, >> >> On 10.8.2017 21:10, Rob Herring wrote: >>> On Fri, Aug 04, 2017 at 03:45:30PM +0200, Michal Simek wrote: >>>> From: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx> >>>> >>>> Document the DT bindings for the Zynq UltraScale+ PM Firmware. >>>> >>>> Signed-off-by: Soren Brinkmann <soren.brinkmann@xxxxxxxxxx> >>>> Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx> >>>> --- >>>> >>>> .../devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt | 19 +++++++++++++++++++ >>> >>> bindings/firmware/ >> >> will move. >> >>> >>>> 1 file changed, 19 insertions(+) >>>> create mode 100644 Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt >>>> >>>> diff --git a/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt >>>> new file mode 100644 >>>> index 000000000000..222a18ce07fc >>>> --- /dev/null >>>> +++ b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-pm.txt >>>> @@ -0,0 +1,19 @@ >>>> +Xilinx Zynq MPSoC Firmware Device Tree Bindings >>>> + >>>> +The zynqmp-pm node describes the interface to platform firmware. >>> >>> Please define this should be under /firmware node. >>> >>>> +Required properties: >>>> + - compatible: Must contain: "xlnx,zynqmp-pm" >>>> + - method: The method of calling the PM-API firmware layer. >>>> + Permitted values are: >>>> + - "smc" : To be used in configurations without a hypervisor >>>> + - "hvc" : To be used when hypervisor is present >>> >>> Do you really use both? >>> >> >> SMCs definitely yes. >> >> Interface was designed in that way and I don't know if people are using >> it or not. >> >> Not sure if Xen is blocking SMCs. I know we have discussed it but not >> sure if this is enabled by default or only for certain configurations. >> Also not sure if xen contains handler for hvc. >> Edgar: Do you know? > > We have patches for Xen that implement a power-management mediator. > That implementation handles PM calls over both SMC and HVC insns. > Patches are on the Xen mailing list. > > Other hypervisors may work differently. > > I think we should support both but I don't have a strong opinion on it. Rob: Are you ok with having it there? Thanks, Michal -- 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
