mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-27 05:23:34 +00:00
729c2db7a9
The DT binding for the Tegra186 HSP module apparently wasn't quite final when I posted initial U-Boot support for it. Add the final DT binding doc and adapt all code and DT files to match it. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
52 lines
1.7 KiB
Text
52 lines
1.7 KiB
Text
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>;
|
|
};
|