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[v2,2/6] dt-bindings: dma: dw: Add max burst transaction length property

Message ID 20200508105304.14065-3-Sergey.Semin@baikalelectronics.ru
State New
Headers show
Series dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account | expand

Commit Message

Serge Semin May 8, 2020, 10:53 a.m. UTC 
This array property is used to indicate the maximum burst transaction
length supported by each DMA channel.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Viresh Kumar <vireshk@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: linux-mips@vger.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.
---
 .../devicetree/bindings/dma/snps,dma-spear1340.yaml  | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
index e7611840a7cf..7df4f9ad418a 100644
--- a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
+++ b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
@@ -120,6 +120,18 @@  properties:
         enum: [0, 1]
         default: 1
 
+  snps,max-burst-len:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    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 (data-width) field.
+    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: |