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author | Tom Rini <trini@konsulko.com> | 2016-08-05 14:09:15 -0400 |
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committer | Tom Rini <trini@konsulko.com> | 2016-08-05 20:55:30 -0400 |
commit | 7edb17670cdca0ee5de8b8eb61753ad6b7fc33e6 (patch) | |
tree | 33e0817d373a2db9fa3d91d8904cd6f8bbf807fa /doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt | |
parent | a60d94b204412732409e70cb15236bd96d4da7d9 (diff) | |
parent | cb0ff4ccc039435bef627883ade3e3911805cec5 (diff) | |
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Merge branch 'master' of git://git.denx.de/u-boot-tegra
Diffstat (limited to 'doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt')
-rw-r--r-- | doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt b/doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt new file mode 100644 index 0000000..a915238 --- /dev/null +++ b/doc/device-tree-bindings/mailbox/nvidia,tegra186-hsp.txt @@ -0,0 +1,52 @@ +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" +- 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" + 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 data. The first one should be the HSP type and the second +one should be the ID that the client is going to use. Those information +can be found in the following file. + +- <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 HSP_MBOX_TYPE_DB HSP_DB_MASTER_XXX>; +}; |