From: Krzysztof Kozlowski <krzk@kernel.org>
To: Harini T <harini.t@amd.com>
Cc: jassisinghbrar@gmail.com, robh@kernel.org, krzk+dt@kernel.org,
conor+dt@kernel.org, michal.simek@amd.com,
shubhrajyoti.datta@amd.com, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
git@amd.com
Subject: Re: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement
Date: Mon, 22 Dec 2025 10:09:08 +0100 [thread overview]
Message-ID: <20251222-funny-aspiring-seal-05c4ae@quoll> (raw)
In-Reply-To: <20251222044653.1757886-1-harini.t@amd.com>
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@amd.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
next prev parent reply other threads:[~2025-12-22 9:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-22 4:46 [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement Harini T
2025-12-22 9:09 ` Krzysztof Kozlowski [this message]
2025-12-23 10:48 ` T, Harini
2026-02-08 10:36 ` Krzysztof Kozlowski
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