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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.txt
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     Array of strings.
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     one of:
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     - "nvidia,tegra186-hsp"
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+    - "nvidia,tegra194-hsp", "nvidia,tegra186-hsp"
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 - reg : Offset and length of the register set for the device.
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 - interrupt-names
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     Array of strings.
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     Contains a list of names for the interrupts described by the interrupt
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     property. May contain the following entries, in any order:
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     - "doorbell"
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+    - "sharedN", where 'N' is a number from zero up to the number of
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+      external interrupts supported by the HSP instance minus one.
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     Users of this binding MUST look up entries in the interrupt property
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     by name, using this interrupt-names property to do so.
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 - interrupts
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     in a matching order.
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 - #mbox-cells : Should be 2.
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-The mbox specifier of the "mboxes" property in the client node should
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-contain two data. The first one should be the HSP type and the second
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-one should be the ID that the client is going to use. Those information
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-can be found in the following file.
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+The mbox specifier of the "mboxes" property in the client node should contain
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+two cells. The first cell determines the HSP type and the second cell is used
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+to identify the mailbox that the client is going to use.
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-- <dt-bindings/mailbox/tegra186-hsp.h>.
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+For doorbells, the second cell specifies the index of the doorbell to use.
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+
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+For shared mailboxes, the second cell is composed of two fields:
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+- bits 31..24:
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+    A bit mask of flags that further specify how the shared mailbox will be
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+    used. Valid flags are:
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+    - bit 31:
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+        Defines the direction of the mailbox. If set, the mailbox will be used
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+        as a producer (i.e. used to send data). If cleared, the mailbox is the
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+        consumer of data sent by a producer.
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+
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+- bits 23.. 0:
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+    The index of the shared mailbox to use. The number of available mailboxes
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+    may vary by instance of the HSP block and SoC generation.
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+
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+The following file contains definitions that can be used to construct mailbox
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+specifiers:
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+    <dt-bindings/mailbox/tegra186-hsp.h>
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 Example:
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