Ping, any comments? Thanks, Wendy > -----Original Message----- > From: Wendy Liang [mailto:wendy.liang@xxxxxxxxxx] > Sent: Monday, November 05, 2018 2:37 PM > To: jassisinghbrar@xxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>; > robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx; Jiaying Liang <jliang@xxxxxxxxxx> > Subject: [PATCH v5 2/2] dt-bindings: mailbox: Add Xilinx IPI Mailbox > > Xilinx ZynqMP IPI(Inter Processor Interrupt) is a hardware block in ZynqMP > SoC used for the communication between various processor systems. > > Signed-off-by: Wendy Liang <wendy.liang@xxxxxxxxxx> > --- > .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt | 128 > +++++++++++++++++++++ > 1 file changed, 128 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt > > diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi- > mailbox.txt b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi- > mailbox.txt > new file mode 100644 > index 0000000..18fd7b4 > --- /dev/null > +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox. > +++ txt > @@ -0,0 +1,128 @@ > +Xilinx IPI Mailbox Controller > +======================================== > + > +The Xilinx IPI(Inter Processor Interrupt) mailbox controller is to > +manage messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. > +Each IPI agent owns registers used for notification and buffers for message. > + > + +-------------------------------------+ > + | Xilinx ZynqMP IPI Controller | > + +-------------------------------------+ > + +--------------------------------------------------+ > +ATF | | > + | | > + | | > + +--------------------------+ | > + | | > + | | > + +--------------------------------------------------+ > + +------------------------------------------+ > + | +----------------+ +----------------+ | > +Hardware | | IPI Agent | | IPI Buffers | | > + | | Registers | | | | > + | | | | | | > + | +----------------+ +----------------+ | > + | | > + | Xilinx IPI Agent Block | > + +------------------------------------------+ > + > + > +Controller Device Node: > +=========================== > +Required properties: > +-------------------- > +IPI agent node: > +- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox" > +- interrupt-parent: Phandle for the interrupt controller > +- interrupts: Interrupt information corresponding to the > + interrupt-names property. > +- xlnx,ipi-id: local Xilinx IPI agent ID > +- #address-cells: number of address cells of internal IPI mailbox nodes > +- #size-cells: number of size cells of internal IPI mailbox nodes > + > +Internal IPI mailbox node: > +- reg: IPI buffers address ranges > +- reg-names: Names of the reg resources. It should have: > + * local_request_region > + - IPI request msg buffer written by local and read > + by remote > + * local_response_region > + - IPI response msg buffer written by local and read > + by remote > + * remote_request_region > + - IPI request msg buffer written by remote and read > + by local > + * remote_response_region > + - IPI response msg buffer written by remote and > read > + by local > +- #mbox-cells: Shall be 1. It contains: > + * tx(0) or rx(1) channel > +- xlnx,ipi-id: remote Xilinx IPI agent ID of which the mailbox is > + connected to. > + > +Optional properties: > +-------------------- > +- method: The method of accessing the IPI agent registers. > + Permitted values are: "smc" and "hvc". Default is > + "smc". > + > +Client Device Node: > +=========================== > +Required properties: > +-------------------- > +- mboxes: Standard property to specify a mailbox > + (See ./mailbox.txt) > +- mbox-names: List of identifier strings for each mailbox > + channel. > + > +Example: > +=========================== > + zynqmp_ipi { > + compatible = "xlnx,zynqmp-ipi-mailbox"; > + interrupt-parent = <&gic>; > + interrupts = <0 29 4>; > + xlnx,ipi-id = <0>; > + #address-cells = <1>; > + #size-cells = <1>; > + > + /* APU<->RPU0 IPI mailbox controller */ > + ipi_mailbox_rpu0: mailbox@ff90400 { > + compatible = "xlnx,zynqmp-ipi-mailbox"; > + reg = <0xff990400 0x20>, > + <0xff990420 0x20>, > + <0xff990080 0x20>, > + <0xff9900a0 0x20>; > + reg-names = "local_request_region", > + "local_response_region", > + "remote_request_region", > + "remote_response_region"; > + #mbox-cells = <1>; > + xlnx,ipi-id = <1>; > + }; > + /* APU<->RPU1 IPI mailbox controller */ > + ipi_mailbox_rpu1: mailbox@ff990440 { > + compatible = "xlnx,zynqmp-ipi-mailbox"; > + reg = <0xff990440 0x20>, > + <0xff990460 0x20>, > + <0xff990280 0x20>, > + <0xff9902a0 0x20>; > + reg-names = "local_request_region", > + "local_response_region", > + "remote_request_region", > + "remote_response_region"; > + #mbox-cells = <1>; > + xlnx,ipi-id = <2>; > + }; > + }; > + rpu0 { > + ... > + mboxes = <&ipi_mailbox_rpu0 0>, > + <&ipi_mailbox_rpu0 1>; > + mbox-names = "tx", "rx"; > + }; > + rpu1 { > + ... > + mboxes = <&ipi_mailbox_rpu1 0>, > + <&ipi_mailbox_rpu1 1>; > + mbox-names = "tx", "rx"; > + }; > -- > 2.7.4
