linux-kernel - [RFC V3 PATCH 2/8] dt-bindings: dmaengine: xilinx

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Date:   Tue, 20 Sep 2022 11:21:13 +0530
From:   Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
To:     <vkoul@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <lars@...afoo.de>,
        <adrianml@...mnos.upm.es>
CC:     <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <michal.simek@....com>,
        <radhey.shyam.pandey@....com>, <anirudha.sarangi@....com>,
        <harini.katakam@....com>, <sarath.babu.naidu.gaddam@....com>,
        <git@...inx.com>, <git@....com>
Subject: [RFC V3 PATCH 2/8] dt-bindings: dmaengine: xilinx_dma: Add xlnx,irq-delay property

From: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>

Add an optional AXI DMA property 'xlnx,irq-delay'. It specifies interrupt
timeout value and causes the DMA engine to generate an interrupt after the
delay time period has expired. Timer begins counting at the end of a packet
and resets with receipt of a new packet or a timeout event occurs.

This property is useful when AXI DMA is connected to the streaming IP i.e
axiethernet where inter packet latency is critical while still taking the
benefit of interrupt coalescing.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sarath Babu Naidu Gaddam <sarath.babu.naidu.gaddam@....com>
---
Changes in V3:
- Add rob acked-by.

Changes in V2:
- New patch. Introduce xlnx,irq-delay property for low latency usecases.
---
 Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
index 18445aa092ab..9793523633a4 100644
--- a/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
+++ b/Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt
@@ -50,7 +50,9 @@ Optional properties for AXI DMA and MCDMA:
 	is missing or invalid then the default value 23 is used. This is the
 	maximum value that is supported by all IP versions.
 - xlnx,axistream-connected: Tells whether DMA is connected to AXI stream IP.
-
+- xlnx,irq-delay: Tells the interrupt delay timeout value. Valid range is from
+	0-255. Setting this value to zero disables the delay timer interrupt.
+	1 timeout interval = 125 * clock period of SG clock.
 Optional properties for VDMA:
 - xlnx,flush-fsync: Tells which channel to Flush on Frame sync.
 	It takes following values:
-- 
2.25.1