From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wendy Liang Subject: [RFC 2/2] dt-bindings: mailbox: Add Xilinx IPI Mailbox Date: Wed, 29 Nov 2017 15:59:07 -0800 Message-ID: <1511999947-8274-3-git-send-email-jliang@xilinx.com> References: <1511999947-8274-1-git-send-email-jliang@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1511999947-8274-1-git-send-email-jliang-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Wendy Liang List-Id: devicetree@vger.kernel.org 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 --- .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt | 113 +++++++++++++++++++++ 1 file changed, 113 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..a118d00 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt @@ -0,0 +1,113 @@ +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: +-------------------- +- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox" +- 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-ids: Xilinx IPI agent IDs of the two peers of the + Xilinx IPI communication channel. +- interrupt-parent: Phandle for the interrupt controller +- interrupts: Interrupt information corresponding to the + interrupt-names property. + +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: +=========================== + /* APU<->RPU0 IPI mailbox controller */ + ipi_mailbox_rpu0: mailbox@ff90400 { + compatible = "xlnx,zynqmp-ipi-mailbox"; + reg = <0x0 0xff990400 0x0 0x20>, + <0x0 0xff990420 0x0 0x20>, + <0x0 0xff990080 0x0 0x20>, + <0x0 0xff9900a0 0x0 0x20>; + reg-names = "local_request_region", "local_response_region", + "remote_request_region", "remote_response_region"; + #mbox-cells = <1>; + xlnx-ipi-ids = <0 1>; + interrupt-parent = <&gic>; + interrupts = <0 29 4>; + }; + /* APU<->RPU1 IPI mailbox controller */ + ipi_mailbox_rpu1: mailbox@ff990440 { + compatible = "xlnx,zynqmp-ipi-mailbox"; + reg = <0x0 0xff990440 0x0 0x20>, + <0x0 0xff990460 0x0 0x20>, + <0x0 0xff990280 0x0 0x20>, + <0x0 0xff9902a0 0x0 0x20>; + reg-names = "local_request_region", "local_response_region", + "remote_request_region", "remote_response_region"; + #mbox-cells = <1>; + xlnx-ipi-ids = <0 2>; + interrupt-parent = <&gic>; + interrupts = <0 29 4>; + }; + 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 -- 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