linux-kernel - Re: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement

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Message-ID: <20251222-funny-aspiring-seal-05c4ae@quoll>
Date: Mon, 22 Dec 2025 10:09:08 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Harini T <harini.t@....com>
Cc: jassisinghbrar@...il.com, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, michal.simek@....com, shubhrajyoti.datta@....com, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	git@....com
Subject: Re: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document
 msg region requirement

On Mon, Dec 22, 2025 at 10:16:53AM +0530, Harini T wrote:
> Add description clarifying that for Versal IPI mailboxes, both host and
> remote agents must have the "msg" register region defined for successful
> message passing. Without both, only notification-based communication
> works.
> 
> Signed-off-by: Harini T <harini.t@....com>
> ---
>  .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml           | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml
> index 04d6473d666f..8fdf77c7935c 100644
> --- a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml
> +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml
> @@ -165,6 +165,12 @@ allOf:
>          reg-names: false
>  
>      else:
> +      description:

Else block cannot have description.

> +        For Versal IPI mailboxes, the "msg" register region is optional.

So it is optional...

> +        However, for successful message passing via mailbox, both the host IPI

And it is not optional. If nothing works, then it is not optional.

And why would it be optional in the first place? You generate your same
IP with different settings?

Best regards,
Krzysztof