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

Serge Semin
2020-05-08T10:53:38Z

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(+)

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: |
--
2.25.1