linux-kernel - [PATCH v2 14/19] dmaengine: ti: Add support for k3 event routers

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Date:   Tue, 17 Nov 2020 12:56:51 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>, <nm@...com>, <ssantosh@...nel.org>,
        <robh+dt@...nel.org>
CC:     <dan.j.williams@...el.com>, <t-kristo@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <dmaengine@...r.kernel.org>, <vigneshr@...com>,
        <grygorii.strashko@...com>
Subject: [PATCH v2 14/19] dmaengine: ti: Add support for k3 event routers

In k3 architecture a DMA channel (in TR momde) can be triggered by global
events, origination from different modules.

The events for triggers can be sent from any module which is connected to
PSI-L fabric, but the event number to be sent is DMA channel specific, it
is only known after the channel itself is requested.

The router operation needs to be split up:
- route_allocate: configure the dma_spec for the DMA and store the
  configuration which is needed for the router's input
- set_event: callback used by the DMA driver to set the event number for
  the channel and enable the routing

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 include/linux/dma/k3-event-router.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 include/linux/dma/k3-event-router.h

diff --git a/include/linux/dma/k3-event-router.h b/include/linux/dma/k3-event-router.h
new file mode 100644
index 000000000000..e3f88b2f87be
--- /dev/null
+++ b/include/linux/dma/k3-event-router.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com
+ */
+
+#ifndef K3_EVENT_ROUTER_
+#define K3_EVENT_ROUTER_
+
+#include <linux/types.h>
+
+struct k3_event_route_data {
+	void *priv;
+	int (*set_event)(void *priv, u32 event);
+};
+
+#endif /* K3_EVENT_ROUTER_ */
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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