From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Simek Subject: Re: [PATCHv2 1/3] dt: xilinx: zynqmp: Add bindings for PM firmware Date: Thu, 17 Aug 2017 08:26:34 +0200 Message-ID: <04d8618e-4f39-9caf-95cb-60af35dba662@xilinx.com> References: <2935be9896d54020720919e7dab7c2f86bdc83a3.1502886277.git.michal.simek@xilinx.com> <20170816160046.GB12389@leverpostej> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170816160046.GB12389@leverpostej> Content-Language: en-US Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mark Rutland , Michal Simek Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Arnd Bergmann , edgar.iglesias-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org, Rob Herring , Soren Brinkmann , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, monstr-pSz03upnqPeHXe+LvDLADg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rob Herring List-Id: devicetree@vger.kernel.org On 16.8.2017 18:00, Mark Rutland wrote: > On Wed, Aug 16, 2017 at 02:24:56PM +0200, Michal Simek wrote: >> From: Soren Brinkmann >> >> Document the DT bindings for the Zynq UltraScale+ PM Firmware. >> >> Signed-off-by: Soren Brinkmann >> Signed-off-by: Michal Simek >> --- >> >> Changes in v2: >> - Move to bindings/firmware and also add it to firmware node >> Reported-by Rob >> >> .../bindings/firmware/xlnx,zynqmp-pm.txt | 22 ++++++++++++++++++++++ >> 1 file changed, 22 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt >> >> diff --git a/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt b/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt >> new file mode 100644 >> index 000000000000..7de0c82758b3 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt >> @@ -0,0 +1,22 @@ >> +Xilinx Zynq MPSoC Firmware Device Tree Bindings >> + >> +The zynqmp-pm node describes the interface to platform firmware. > > Is there any documentation for this? I appreciate that the answer > might be "no". We have pm documentation somewhere but not sure if this firmware interface is the part of it. Let me ask around and see what I can find out. > >> +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 >> + - interrupts: Interrupt specifier > > For what, exactly? > > Is this an interrupt for FW to signal the OS somehow? > > If so, is it an SGI? This is SPI. There is a dedicated hardware on the chip for communication with APU. https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf page 275 Anyway I don't need this for this driver that's why I will remove it. Thanks, Michal -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html