linux-kernel - [PATCH 0/4] Add APIs to request TX/RX DMA channels by ID

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Date:   Tue, 14 Nov 2023 14:09:02 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     <peter.ujfalusi@...il.com>, <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <vigneshr@...com>, <s-vadapalli@...com>
Subject: [PATCH 0/4] Add APIs to request TX/RX DMA channels by ID

The existing APIs for requesting TX and RX DMA channels rely on parsing
a device-tree node to obtain the Channel/Thread IDs from their names.
However, it is possible to know the thread IDs by alternative means such
as being informed by Firmware on a remote core regarding the allocated
TX/RX DMA channel IDs. Thus, add APIs to support such use cases.

Additionally, since the name of the device for the remote RX channel is
being set purely on the basis of the RX channel ID itself, it can result
in duplicate names when multiple flows are used on the same channel.
Avoid name duplication by including the flow in the name.

Series is based on linux-next tagged next-20231114.

RFC Series:
https://lore.kernel.org/r/20231111121555.2656760-1-s-vadapalli@ti.com/

Changes since RFC Series:
- Rebased patches 1, 2 and 3 on linux-next tagged next-20231114.
- Added patch 4 to the series.

Regards,
Siddharth.

Siddharth Vadapalli (4):
  dmaengine: ti: k3-udma-glue: Add function to parse channel by ID
  dmaengine: ti: k3-udma-glue: Add function to request TX channel by ID
  dmaengine: ti: k3-udma-glue: Add function to request RX channel by ID
  dmaengine: ti: k3-udma-glue: Update name for remote RX channel device

 drivers/dma/ti/k3-udma-glue.c    | 306 ++++++++++++++++++++++---------
 include/linux/dma/k3-udma-glue.h |   8 +
 2 files changed, 228 insertions(+), 86 deletions(-)

-- 
2.34.1