linux-kernel - [PATCH 2/5] dt-bindings: dma: dw: Add max burst transaction length property bindings

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Message-Id: <20200306131049.37EDD8030708@mail.baikalelectronics.ru>
Date:   Fri, 6 Mar 2020 16:10:31 +0300
From:   <Sergey.Semin@...kalelectronics.ru>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] dt-bindings: dma: dw: Add max burst transaction length property bindings

From: Serge Semin <Sergey.Semin@...kalelectronics.ru>

This array property is used to indicate the maximum burst transaction
length supported by each DMA channel.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Paul Burton <paulburton@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
---
 .../devicetree/bindings/dma/snps,dma-spear1340.yaml  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
index d7f9383ceb8f..308ec6482064 100644
--- a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
@@ -126,6 +126,18 @@ properties:
           enum: [0, 1]
           default: 0
 
+  snps,max-burst-len:
+    description: |
+      Maximum length of burst transactions supported by hardware.
+      It's an array property with one cell per channel in units of
+      CTLx register SRC_TR_WIDTH/DST_TR_WIDTH field.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+      - maxItems: 8
+        items:
+          enum: [4, 8, 16, 32, 64, 128, 256]
+          default: 0
+
   snps,dma-protection-control:
     description: |
       Bits one-to-one passed to the AHB HPROT[3:1] bus. Each bit setting
-- 
2.25.1