linux-kernel - [PATCH v3 02/10] dt-bindings: dma: dw: Add max burst transaction length property

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Date:   Wed, 27 May 2020 01:50:13 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Vinod Koul <vkoul@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
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>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        <linux-mips@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 02/10] dt-bindings: dma: dw: Add max burst transaction length property

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>
Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-mips@...r.kernel.org

---

Changelog v2:
- Rearrange SoBs.
- Move $ref to the root level of the properties. So do with the
  constraints.
- Set default max-burst-len to 256 TR-WIDTH words.

Changelog v3:
- Add more details into the property description about what limitations
  snps,max-burst-len defines.
---
 .../bindings/dma/snps,dma-spear1340.yaml          | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
index e7611840a7cf..20870f5c14dd 100644
--- a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
@@ -120,6 +120,21 @@ properties:
         enum: [0, 1]
         default: 1
 
+  snps,max-burst-len:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: |
+      Maximum length of the burst transactions supported by the controller.
+      This property defines the upper limit of the run-time burst setting
+      (CTLx.SRC_MSIZE/CTLx.DST_MSIZE fields) so the allowed burst length
+      will be from 1 to max-burst-len words. It's an array property with one
+      cell per channel in the units determined by the value set in the
+      CTLx.SRC_TR_WIDTH/CTLx.DST_TR_WIDTH fields (data width).
+    items:
+      maxItems: 8
+      items:
+        enum: [4, 8, 16, 32, 64, 128, 256]
+        default: 256
+
   snps,dma-protection-control:
     $ref: /schemas/types.yaml#definitions/uint32
     description: |
-- 
2.26.2