Re: [PATCH 1/6] mailbox: Add new API mbox_channel_device() for clients

On Thu, Feb 2, 2017 at 10:17 AM, Anup Patel [off-list ref] wrote:

The remote processor can have DMAENGINE capabilities and client
can pass data to be processed via main memory. In such cases,
the client will require DMAble memory for remote processor.

This patch adds new API mbox_channel_device() which can be
used by clients to get struct device pointer of underlying
mailbox controller. This struct device pointer of mailbox
controller can be used by clients to allocate DMAble memory
for remote processor.

IIUC, DT already provides a way for what you need.