diff options
Diffstat (limited to 'dts/Bindings/mailbox/omap-mailbox.txt')
| -rw-r--r-- | dts/Bindings/mailbox/omap-mailbox.txt | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/dts/Bindings/mailbox/omap-mailbox.txt b/dts/Bindings/mailbox/omap-mailbox.txt deleted file mode 100644 index 12371f5c6c..0000000000 --- a/dts/Bindings/mailbox/omap-mailbox.txt +++ /dev/null @@ -1,184 +0,0 @@ -OMAP2+ and K3 Mailbox -===================== - -The OMAP mailbox hardware facilitates communication between different processors -using a queued mailbox interrupt mechanism. The IP block is external to the -various processor subsystems and is connected on an interconnect bus. The -communication is achieved through a set of registers for message storage and -interrupt configuration registers. - -Each mailbox IP block/cluster has a certain number of h/w fifo queues and output -interrupt lines. An output interrupt line is routed to an interrupt controller -within a processor subsystem, and there can be more than one line going to a -specific processor's interrupt controller. The interrupt line connections are -fixed for an instance and are dictated by the IP integration into the SoC -(excluding the SoCs that have a Interrupt Crossbar IP). Each interrupt line is -programmable through a set of interrupt configuration registers, and have a rx -and tx interrupt source per h/w fifo. Communication between different processors -is achieved through the appropriate programming of the rx and tx interrupt -sources on the appropriate interrupt lines. - -The number of h/w fifo queues and interrupt lines dictate the usable registers. -All the current OMAP SoCs except for the newest DRA7xx SoC has a single IP -instance. DRA7xx has multiple instances with different number of h/w fifo queues -and interrupt lines between different instances. The interrupt lines can also be -routed to different processor sub-systems on DRA7xx as they are routed through -the Crossbar, a kind of interrupt router/multiplexer. The K3 AM65x and J721E -SoCs has each of these instances form a cluster and combine multiple clusters -into a single IP block present within the Main NavSS. The interrupt lines from -all these clusters are multiplexed and routed to different processor subsystems -over a limited number of common interrupt output lines of an Interrupt Router. -The AM64x SoCS also uses a single IP block comprising of multiple clusters, -but the number of clusters are smaller, and the interrupt output lines are -connected directly to various processors. - -Mailbox Device Node: -==================== -A Mailbox device node is used to represent a Mailbox IP instance/cluster within -a SoC. The sub-mailboxes are represented as child nodes of this parent node. - -Required properties: --------------------- -- compatible: Should be one of the following, - "ti,omap2-mailbox" for OMAP2420, OMAP2430 SoCs - "ti,omap3-mailbox" for OMAP3430, OMAP3630 SoCs - "ti,omap4-mailbox" for OMAP44xx, OMAP54xx, AM33xx, - AM43xx and DRA7xx SoCs - "ti,am654-mailbox" for K3 AM65x and J721E SoCs - "ti,am64-mailbox" for K3 AM64x SoCs -- reg: Contains the mailbox register address range (base - address and length) -- interrupts: Contains the interrupt information for the mailbox - device. The format is dependent on which interrupt - controller the Mailbox device uses -- #mbox-cells: Common mailbox binding property to identify the number - of cells required for the mailbox specifier. Should be - 1 -- ti,mbox-num-users: Number of targets (processor devices) that the mailbox - device can interrupt -- ti,mbox-num-fifos: Number of h/w fifo queues within the mailbox IP block - -SoC-specific Required properties: ---------------------------------- -The following are mandatory properties for the OMAP architecture based SoCs -only: -- ti,hwmods: Name of the hwmod associated with the mailbox. This - should be defined in the mailbox node only if the node - is not defined as a child node of a corresponding sysc - interconnect node. - -The following are mandatory properties for the K3 AM65x and J721E SoCs only: -- interrupt-parent: Should contain a phandle to the TI-SCI interrupt - controller node that is used to dynamically program - the interrupt routes between the IP and the main GIC - controllers. See the following binding for additional - details, - Documentation/devicetree/bindings/interrupt-controller/ti,sci-intr.yaml - -Child Nodes: -============ -A child node is used for representing the actual sub-mailbox device that is -used for the communication between the host processor and a remote processor. -Each child node should have a unique node name across all the different -mailbox device nodes. - -Required properties: --------------------- -- ti,mbox-tx: sub-mailbox descriptor property defining a Tx fifo -- ti,mbox-rx: sub-mailbox descriptor property defining a Rx fifo - -Sub-mailbox Descriptor Data ---------------------------- -Each of the above ti,mbox-tx and ti,mbox-rx properties should have 3 cells of -data that represent the following: - Cell #1 (fifo_id) - mailbox fifo id used either for transmitting - (ti,mbox-tx) or for receiving (ti,mbox-rx) - Cell #2 (irq_id) - irq identifier index number to use from the parent's - interrupts data. Should be 0 for most of the cases, a - positive index value is seen only on mailboxes that have - multiple interrupt lines connected to the MPU processor. - Cell #3 (usr_id) - mailbox user id for identifying the interrupt line - associated with generating a tx/rx fifo interrupt. - -Optional Properties: --------------------- -- ti,mbox-send-noirq: Quirk flag to allow the client user of this sub-mailbox - to send messages without triggering a Tx ready interrupt, - and to control the Tx ticker. Should be used only on - sub-mailboxes used to communicate with WkupM3 remote - processor on AM33xx/AM43xx SoCs. - -Mailbox Users: -============== -A device needing to communicate with a target processor device should specify -them using the common mailbox binding properties, "mboxes" and the optional -"mbox-names" (please see Documentation/devicetree/bindings/mailbox/mailbox.txt -for details). Each value of the mboxes property should contain a phandle to the -mailbox controller device node and an args specifier that will be the phandle to -the intended sub-mailbox child node to be used for communication. The equivalent -"mbox-names" property value can be used to give a name to the communication channel -to be used by the client user. - - -Example: --------- - -1. /* OMAP4 */ -mailbox: mailbox@4a0f4000 { - compatible = "ti,omap4-mailbox"; - reg = <0x4a0f4000 0x200>; - interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>; - ti,hwmods = "mailbox"; - #mbox-cells = <1>; - ti,mbox-num-users = <3>; - ti,mbox-num-fifos = <8>; - mbox_ipu: mbox_ipu { - ti,mbox-tx = <0 0 0>; - ti,mbox-rx = <1 0 0>; - }; - mbox_dsp: mbox_dsp { - ti,mbox-tx = <3 0 0>; - ti,mbox-rx = <2 0 0>; - }; -}; - -dsp { - ... - mboxes = <&mailbox &mbox_dsp>; - ... -}; - -2. /* AM33xx */ -mailbox: mailbox@480c8000 { - compatible = "ti,omap4-mailbox"; - reg = <0x480C8000 0x200>; - interrupts = <77>; - ti,hwmods = "mailbox"; - #mbox-cells = <1>; - ti,mbox-num-users = <4>; - ti,mbox-num-fifos = <8>; - mbox_wkupm3: wkup_m3 { - ti,mbox-tx = <0 0 0>; - ti,mbox-rx = <0 0 3>; - }; -}; - -3. /* AM65x */ -&cbass_main { - cbass_main_navss: interconnect0 { - mailbox0_cluster0: mailbox@31f80000 { - compatible = "ti,am654-mailbox"; - reg = <0x00 0x31f80000 0x00 0x200>; - #mbox-cells = <1>; - ti,mbox-num-users = <4>; - ti,mbox-num-fifos = <16>; - interrupt-parent = <&intr_main_navss>; - interrupts = <164 0>; - - mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 { - ti,mbox-tx = <1 0 0>; - ti,mbox-rx = <0 0 0>; - }; - }; - }; -}; |