Commit 58919326 authored by Kartik's avatar Kartik Committed by Jassi Brar
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dt-bindings: tegra186-hsp: add type for shared mailboxes 



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: default avatarKartik <kkartik@nvidia.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
parent 8f585d14

Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml

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  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.

include/dt-bindings/mailbox/tegra186-hsp.h

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@@ -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.