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"michal.simek@xilinx.com" , "robh+dt@kernel.org" , "mark.rutland@arm.com" CC: "ard.biesheuvel@linaro.org" , "mingo@kernel.org" , "keescook@chromium.org" , "dmitry.torokhov@gmail.com" , Rajan Vaja , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" Subject: RE: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP firmware Thread-Topic: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP firmware Thread-Index: AQHTqoAmKKGb/CVRXk2mfd+L4ykECqO7enoAgAnz4+A= Date: Wed, 7 Mar 2018 22:25:03 +0000 Message-ID: References: <1519154467-2896-1-git-send-email-jollys@xilinx.com> <1519154467-2896-2-git-send-email-jollys@xilinx.com> <778329dd-76a7-0151-26d9-30e87e0c888d@arm.com> In-Reply-To: <778329dd-76a7-0151-26d9-30e87e0c888d@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-TNEF-Correlator: x-originating-ip: [149.199.62.254] 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linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Sudeep, > -----Original Message----- > From: Sudeep Holla [mailto:sudeep.holla at arm.com] > Sent: Thursday, March 01, 2018 6:15 AM > To: Jolly Shah ; gregkh at linuxfoundation.org; > matt at codeblueprint.co.uk; hkallweit1 at gmail.com; michal.simek at xilinx.com; > robh+dt at kernel.org; mark.rutland at arm.com > Cc: ard.biesheuvel at linaro.org; mingo at kernel.org; keescook at chromium.org; > dmitry.torokhov at gmail.com; Sudeep Holla ; Rajan > Vaja ; linux-arm-kernel at lists.infradead.org; linux- > kernel at vger.kernel.org; devicetree at vger.kernel.org; Jolly Shah > > Subject: Re: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP > firmware > > > > On 20/02/18 19:21, Jolly Shah wrote: > > Add documentation to describe Xilinx ZynqMP firmware driver bindings. > > Firmware driver provides an interface to firmware APIs. Interface APIs > > can be used by any driver to communicate to PMUFW (Platform Management > > Unit). > > > > Signed-off-by: Jolly Shah > > Signed-off-by: Rajan Vaja > > --- > > .../firmware/xilinx/xlnx,zynqmp-firmware.txt | 24 > ++++++++++++++++++++++ > > 1 file changed, 24 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware > > .txt > > > > diff --git > > a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmwa > > re.txt > > b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmwa > > re.txt > > new file mode 100644 > > index 0000000..99434ba > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-fi > > +++ rmware.txt > > @@ -0,0 +1,24 @@ > > +Xilinx Zynq MPSoC Firmware Device Tree Bindings > > + > > +The zynqmp-firmware node describes the interface to platform firmware. > > +ZynqMP has an interface to communicate with secure firmware. Firmware > > +driver provides an interface to firmware APIs. Interface APIs can be > > +used by any driver to communicate to PMUFW(Platform Management Unit). > > +These requests include clock management, pin control, device control, > > +power management service, FPGA service and other platform management > > +services. > > + > > +Required properties: > > + - compatible: Must contain: "xlnx,zynqmp-firmware" > > + - method: The method of calling the PM-API firmware layer. > > + Permitted values are: > > + - "smc" : SMC #0, following the SMCCC > > + - "hvc" : HVC #0, following the SMCCC > > + > > +Examples: > > + firmware { > > + zynqmp_firmware: zynqmp-firmware { > > + compatible = "xlnx,zynqmp-firmware"; > > + method = "smc"; > > + }; > > + }; > > > > Do you foresee using SMC/HVC for this firmware even on future platforms? > If not, I suggest to keep the protocol part separate from the transport i.e. > smc/hvc via ATF. It could be replaced with mailbox or some h/w mechanism in > future ? > We have PSCI and EEMI interfaces exposed to linux from ATF. PSCI is an EEMI client. We do not have current plans to switch to mailbox as it will require 2 communication channels to PMU as PSCI is through ATF. > -- > Regards, > Sudeep