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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/mailbox/ti,omap-mailbox.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: TI OMAP2+ and K3 Mailbox devices8 9maintainers:10 - Suman Anna <s-anna@ti.com>11 12description: |13 The OMAP Mailbox hardware facilitates communication between different14 processors using a queued mailbox interrupt mechanism. The IP block is15 external to the various processor subsystems and is connected on an16 interconnect bus. The communication is achieved through a set of registers17 for message storage and interrupt configuration registers.18 19 Each mailbox IP block/cluster has a certain number of h/w fifo queues and20 output interrupt lines. An output interrupt line is routed to an interrupt21 controller within a processor subsystem, and there can be more than one line22 going to a specific processor's interrupt controller. The interrupt line23 connections are fixed for an instance and are dictated by the IP integration24 into the SoC (excluding the SoCs that have an Interrupt Crossbar or an25 Interrupt Router IP). Each interrupt line is programmable through a set of26 interrupt configuration registers, and have a rx and tx interrupt source per27 h/w fifo. Communication between different processors is achieved through the28 appropriate programming of the rx and tx interrupt sources on the appropriate29 interrupt lines.30 31 The number of h/w fifo queues and interrupt lines dictate the usable32 registers. All the current OMAP SoCs except for the newest DRA7xx SoC has a33 single IP instance. DRA7xx has multiple instances with different number of34 h/w fifo queues and interrupt lines between different instances. The interrupt35 lines can also be routed to different processor sub-systems on DRA7xx as they36 are routed through the Crossbar, a kind of interrupt router/multiplexer. The37 K3 AM65x, J721E and J7200 SoCs has each of these instances form a cluster and38 combine multiple clusters into a single IP block present within the Main39 NavSS. The interrupt lines from all these clusters are multiplexed and routed40 to different processor subsystems over a limited number of common interrupt41 output lines of an Interrupt Router. The AM64x SoCS also uses a single IP42 block comprising of multiple clusters, but the number of clusters are43 smaller, and the interrupt output lines are connected directly to various44 processors.45 46 Mailbox Controller Nodes47 =========================48 A Mailbox device node is used to represent a Mailbox IP instance/cluster49 within a SoC. The sub-mailboxes (actual communication channels) are50 represented as child nodes of this parent node.51 52 Mailbox Users53 ==============54 A device needing to communicate with a target processor device should specify55 them using the common mailbox binding properties, "mboxes" and the optional56 "mbox-names" (please see Documentation/devicetree/bindings/mailbox/mailbox.txt57 for details). Each value of the mboxes property should contain a phandle to58 the mailbox controller device node and an args specifier that will be the59 phandle to the intended sub-mailbox child node to be used for communication.60 The equivalent "mbox-names" property value can be used to give a name to the61 communication channel to be used by the client user.62 63$defs:64 omap-mbox-descriptor:65 $ref: /schemas/types.yaml#/definitions/uint32-array66 description:67 The omap-mbox-descriptor is made of up of 3 cells and represents a single68 uni-directional communication channel. A typical sub-mailbox device uses69 two such channels - one for transmitting (Tx) and one for receiving (Rx).70 items:71 - description:72 mailbox fifo id used either for transmitting on ti,mbox-tx channel or73 for receiving on ti,mbox-rx channel (fifo_id). This is the hardware74 fifo number within a mailbox cluster.75 - description:76 irq identifier index number to use from the parent's interrupts data.77 Should be 0 for most of the cases, a positive index value is seen only78 on mailboxes that have multiple interrupt lines connected to the MPU79 processor (irq_id). This is an index number in the listed interrupts80 property in the DT nodes.81 - description:82 mailbox user id for identifying the interrupt line associated with83 generating a tx/rx fifo interrupt (usr_id). This is the hardware84 user id number within a mailbox cluster.85 86 omap-sub-mailbox:87 type: object88 description:89 The omap-sub-mailbox is a child node within a Mailbox controller device90 node and represents the actual communication channel used to send and91 receive messages between the host processor and a remote processor. Each92 child node should have a unique node name across all the different mailbox93 device nodes.94 95 properties:96 ti,mbox-tx:97 $ref: "#/$defs/omap-mbox-descriptor"98 description: sub-mailbox descriptor property defining a Tx fifo.99 100 ti,mbox-rx:101 $ref: "#/$defs/omap-mbox-descriptor"102 description: sub-mailbox descriptor property defining a Rx fifo.103 104 ti,mbox-send-noirq:105 type: boolean106 description:107 Quirk flag to allow the client user of this sub-mailbox to send108 messages without triggering a Tx ready interrupt, and to control109 the Tx ticker. Should be used only on sub-mailboxes used to110 communicate with WkupM3 remote processor on AM33xx/AM43xx SoCs.111 112 required:113 - ti,mbox-tx114 - ti,mbox-rx115 116properties:117 compatible:118 enum:119 - ti,omap2-mailbox # for OMAP2420, OMAP2430 SoCs120 - ti,omap3-mailbox # for OMAP3430, OMAP3630 SoCs121 - ti,omap4-mailbox # for OMAP44xx, OMAP54xx, AM33xx, AM43xx and DRA7xx SoCs122 - ti,am654-mailbox # for K3 AM65x, J721E and J7200 SoCs123 - ti,am64-mailbox # for K3 AM64x SoCs124 125 reg:126 maxItems: 1127 128 interrupts:129 description:130 Contains the interrupt information for the mailbox device. The format is131 dependent on which interrupt controller the Mailbox device uses. The132 number of interrupts listed will at most be the value specified in133 ti,mbox-num-users property, but is usually limited by the number of134 interrupts reaching the main processor. An interrupt-parent property135 is required on SoCs where the interrupt lines are connected through a136 Interrupt Router before reaching the main processor's GIC.137 138 "#mbox-cells":139 const: 1140 description:141 The specifier is a phandle to an omap-sub-mailbox device.142 143 ti,mbox-num-users:144 $ref: /schemas/types.yaml#/definitions/uint32145 description:146 Number of targets (processor devices) that the mailbox device can147 interrupt.148 149 ti,mbox-num-fifos:150 $ref: /schemas/types.yaml#/definitions/uint32151 description: Number of h/w fifo queues within the mailbox IP block.152 153 ti,hwmods:154 $ref: /schemas/types.yaml#/definitions/string155 deprecated: true156 description:157 Name of the hwmod associated with the mailbox. This should be defined158 in the mailbox node only if the node is not defined as a child node of159 a corresponding sysc interconnect node.160 161 This property is only needed on some legacy OMAP SoCs which have not162 yet been converted to the ti,sysc interconnect hierarchy, but is163 otherwise considered obsolete.164 165patternProperties:166 "^mbox-[a-z0-9-]+$":167 $ref: "#/$defs/omap-sub-mailbox"168 169required:170 - compatible171 - reg172 - interrupts173 - "#mbox-cells"174 - ti,mbox-num-users175 - ti,mbox-num-fifos176 177allOf:178 - if:179 properties:180 compatible:181 enum:182 - ti,am654-mailbox183 - ti,am64-mailbox184 then:185 properties:186 ti,mbox-num-users:187 const: 4188 ti,mbox-num-fifos:189 const: 16190 interrupts:191 minItems: 1192 maxItems: 4193 194 - if:195 properties:196 compatible:197 enum:198 - ti,omap4-mailbox199 then:200 properties:201 ti,mbox-num-users:202 enum: [3, 4]203 ti,mbox-num-fifos:204 enum: [8, 12]205 interrupts:206 minItems: 1207 maxItems: 4208 209 - if:210 properties:211 compatible:212 enum:213 - ti,omap3-mailbox214 then:215 properties:216 ti,mbox-num-users:217 const: 2218 ti,mbox-num-fifos:219 const: 2220 interrupts:221 minItems: 1222 maxItems: 1223 224 - if:225 properties:226 compatible:227 enum:228 - ti,omap2-mailbox229 then:230 properties:231 ti,mbox-num-users:232 const: 4233 ti,mbox-num-fifos:234 const: 6235 interrupts:236 minItems: 1237 maxItems: 2238 239additionalProperties: false240 241examples:242 - |243 /* OMAP4 */244 #include <dt-bindings/interrupt-controller/arm-gic.h>245 mailbox: mailbox@4a0f4000 {246 compatible = "ti,omap4-mailbox";247 reg = <0x4a0f4000 0x200>;248 interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;249 #mbox-cells = <1>;250 ti,mbox-num-users = <3>;251 ti,mbox-num-fifos = <8>;252 253 mbox_ipu: mbox-ipu {254 ti,mbox-tx = <0 0 0>;255 ti,mbox-rx = <1 0 0>;256 };257 mbox_dsp: mbox-dsp {258 ti,mbox-tx = <3 0 0>;259 ti,mbox-rx = <2 0 0>;260 };261 };262 263 dsp {264 mboxes = <&mailbox &mbox_dsp>;265 };266 267 - |268 /* AM33xx */269 mailbox1: mailbox@480c8000 {270 compatible = "ti,omap4-mailbox";271 reg = <0x480c8000 0x200>;272 interrupts = <77>;273 #mbox-cells = <1>;274 ti,mbox-num-users = <4>;275 ti,mbox-num-fifos = <8>;276 277 mbox_wkupm3: mbox-wkup-m3 {278 ti,mbox-tx = <0 0 0>;279 ti,mbox-rx = <0 0 3>;280 ti,mbox-send-noirq;281 };282 };283 284 - |285 /* AM65x */286 mailbox0_cluster0: mailbox@31f80000 {287 compatible = "ti,am654-mailbox";288 reg = <0x31f80000 0x200>;289 #mbox-cells = <1>;290 ti,mbox-num-users = <4>;291 ti,mbox-num-fifos = <16>;292 interrupt-parent = <&intr_main_navss>;293 interrupts = <436>;294 295 mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 {296 ti,mbox-tx = <1 0 0>;297 ti,mbox-rx = <0 0 0>;298 };299 };300