linux-kernel - Re: [PATCH v3 2/9] dt-bindings: mailbox: Add mboxes property for CMDQ secure driver

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Date: Sat, 23 Dec 2023 18:38:31 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: "conor@...nel.org" <conor@...nel.org>
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	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v3 2/9] dt-bindings: mailbox: Add mboxes property for CMDQ
 secure driver

Hi Conor,

Thanks for the reviews.

On Fri, 2023-12-22 at 15:07 +0000, Conor Dooley wrote:
> On Fri, Dec 22, 2023 at 12:52:21PM +0800, Jason-JH.Lin wrote:
> > Add mboxes to define a GCE loopping thread as a secure irq handler.
> > This property is only required if CMDQ secure driver is supported.
> 
> What do drivers have to do with this? Either the mailbox channel
> exists
> or it does not. That said, I am not sure why this should be in DT in
> the
> first place, can't the driver for the mailbox controller reserve a
> channel for its own use?
> 
> Thanks,
> Conor.

Since we implemented our mtk-cmdq-mailbox driver with mailbox
frameworks, one mbox channel bounds to a GCE HW thread.
So if we want to request a mbox channel for using a GCE HW thread for
secure irq handler in mtk-cmdq-mailbox driver itself, I think we need
to add this property to DT.

Regards,
Jason-JH.Lin

[snip]