linux-kernel - Re: [PATCH 2/3] dt-bindings: tegra186-hsp: add type for shared mailboxes

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Date:   Thu, 14 Apr 2022 08:53:32 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kartik <kkartik@...dia.com>
Cc:     jassisinghbrar@...il.com, krzk+dt@...nel.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: tegra186-hsp: add type for shared
 mailboxes

On Thu, Apr 14, 2022 at 01:05:56PM +0530, Kartik wrote:
> 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@...dia.com>

Need a full name here.

> ---
>  .../devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml | 9 +++++++++
>  include/dt-bindings/mailbox/tegra186-hsp.h               | 5 +++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
> index 9f7a7296b57f..a3e87516d637 100644
> --- a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
> +++ b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
> @@ -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.
>  
> diff --git a/include/dt-bindings/mailbox/tegra186-hsp.h b/include/dt-bindings/mailbox/tegra186-hsp.h
> index 3bdec7a84d35..b9ccae2aa9e2 100644
> --- a/include/dt-bindings/mailbox/tegra186-hsp.h
> +++ b/include/dt-bindings/mailbox/tegra186-hsp.h
> @@ -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.
> -- 
> 2.17.1
> 
>