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-NVIDIA Tegra Hardware Synchronization Primitives (HSP)
-
-The HSP modules are used for the processors to share resources and communicate
-together. It provides a set of hardware synchronization primitives for
-interprocessor communication. So the interprocessor communication (IPC)
-protocols can use hardware synchronization primitives, when operating between
-two processors not in an SMP relationship.
-
-The features that HSP supported are shared mailboxes, shared semaphores,
-arbitrated semaphores and doorbells.
-
-Required properties:
-- name : Should be hsp
-- compatible
-    Array of strings.
-    one of:
-    - "nvidia,tegra186-hsp"
-    - "nvidia,tegra194-hsp", "nvidia,tegra186-hsp"
-- reg : Offset and length of the register set for the device.
-- interrupt-names
-    Array of strings.
-    Contains a list of names for the interrupts described by the interrupt
-    property. May contain the following entries, in any order:
-    - "doorbell"
-    - "sharedN", where 'N' is a number from zero up to the number of
-      external interrupts supported by the HSP instance minus one.
-    Users of this binding MUST look up entries in the interrupt property
-    by name, using this interrupt-names property to do so.
-- interrupts
-    Array of interrupt specifiers.
-    Must contain one entry per entry in the interrupt-names property,
-    in a matching order.
-- #mbox-cells : Should be 2.
-
-The mbox specifier of the "mboxes" property in the client node should contain
-two cells. The first cell determines the HSP type and the second cell is used
-to identify the mailbox that the client is going to use.
-
-For doorbells, the second cell specifies the index of the doorbell to use.
-
-For shared mailboxes, the second cell is composed of two fields:
-- bits 31..24:
-    A bit mask of flags that further specify how the shared mailbox will be
-    used. Valid flags are:
-    - bit 31:
-        Defines the direction of the mailbox. If set, the mailbox will be used
-        as a producer (i.e. used to send data). If cleared, the mailbox is the
-        consumer of data sent by a producer.
-
-- bits 23.. 0:
-    The index of the shared mailbox to use. The number of available mailboxes
-    may vary by instance of the HSP block and SoC generation.
-
-The following file contains definitions that can be used to construct mailbox
-specifiers:
-
-    <dt-bindings/mailbox/tegra186-hsp.h>
-
-Example:
-
-hsp_top0: hsp@3c00000 {
-	compatible = "nvidia,tegra186-hsp";
-	reg = <0x0 0x03c00000 0x0 0xa0000>;
-	interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
-	interrupt-names = "doorbell";
-	#mbox-cells = <2>;
-};
-
-client {
-	...
-	mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_DB TEGRA_HSP_DB_MASTER_XXX>;
-};