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dt-bindings: tegra186-hsp: add type for shared mailboxes

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Tegra234 supports sending/receiving 32-bit and 128-bit data over
a shared mailbox. Based on the data size to be used, clients need
to specify the type of shared mailbox in the device tree.

Add a macro for 128-bit shared mailbox. Mailbox clients can use this
macro as a flag in device tree to enable 128-bit data support for a
shared mailbox.

Signed-off-by: Kartik <kkartik@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Kartik 2022-04-14 13:05:56 +05:30 committed by Jassi Brar
parent 8f585d1403
commit 58919326e7
2 changed files with 14 additions and 0 deletions
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9
Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
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@ -26,6 +26,15 @@ description: |
second cell is used to identify the mailbox that the client is going
to use.
For shared mailboxes, the first cell composed of two fields:
- bits 15..8:
A bit mask of flags that further specifies the type of shared
mailbox to be used (based on the data size). If no flag is
specified then, 32-bit shared mailbox is used.
- bits 7..0:
Defines the type of the mailbox to be used. This field should be
TEGRA_HSP_MBOX_TYPE_SM for shared mailboxes.
For doorbells, the second cell specifies the index of the doorbell to
use.

5
include/dt-bindings/mailbox/tegra186-hsp.h
View File

@ -15,6 +15,11 @@
#define TEGRA_HSP_MBOX_TYPE_SS 0x2
#define TEGRA_HSP_MBOX_TYPE_AS 0x3
/*
* These define the types of shared mailbox supported based on data size.
*/
#define TEGRA_HSP_MBOX_TYPE_SM_128BIT (1 << 8)
/*
* These defines represent the bit associated with the given master ID in the
* doorbell registers.