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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Vinod Koul <vkoul@kernel.org>, Viresh Kumar <vireshk@kernel.org>,
	Rob Herring <robh+dt@kernel.org>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Serge Semin <fancer.lancer@gmail.com>,
	Rob Herring <robh@kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Arnd Bergmann <arnd@arndb.de>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	<linux-mips@vger.kernel.org>, <dmaengine@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v7 02/11] dt-bindings: dma: dw: Add max burst transaction length property
Date: Fri, 10 Jul 2020 01:45:41 +0300
Message-ID: <20200709224550.15539-3-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20200709224550.15539-1-Sergey.Semin@baikalelectronics.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@baikalelectronics.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.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.

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


  parent reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-09 22:45 [PATCH RESEND v7 00/11] dmaengine: dw: Take Baikal-T1 SoC DW DMAC peculiarities into account Serge Semin
2020-07-09 22:45 ` [PATCH v7 01/11] dt-bindings: dma: dw: Convert DW DMAC to DT binding Serge Semin
2020-07-09 22:45 ` Serge Semin [this message]
2020-07-09 22:45 ` [PATCH v7 03/11] dmaengine: Introduce min burst length capability Serge Semin
2020-07-09 22:45 ` [PATCH v7 04/11] dmaengine: Introduce max SG list entries capability Serge Semin
2020-07-10  8:31   ` Peter Ujfalusi
2020-07-10  9:27     ` Serge Semin
2020-07-10 11:51       ` Peter Ujfalusi
2020-07-10 16:14         ` Serge Semin
2020-07-15 11:13           ` Vinod Koul
2020-07-15 17:08             ` Serge Semin
2020-07-17  8:14               ` Vinod Koul
2020-07-17 12:36                 ` Serge Semin
2020-07-09 22:45 ` [PATCH v7 05/11] dmaengine: Introduce DMA-device device_caps callback Serge Semin
2020-07-10  8:45   ` Andy Shevchenko
2020-07-10  9:38     ` Serge Semin
2020-07-13  6:51       ` Vinod Koul
2020-07-13 20:13         ` Serge Semin
2020-07-13 20:55       ` Dave Jiang
2020-07-14 16:08         ` Vinod Koul
2020-07-14 16:18           ` Dave Jiang
2020-07-14 16:29             ` Serge Semin
2020-07-14 16:49               ` Dave Jiang
2020-07-09 22:45 ` [PATCH v7 06/11] dmaengine: dw: Take HC_LLP flag into account for noLLP auto-config Serge Semin
2020-07-09 22:45 ` [PATCH v7 07/11] dmaengine: dw: Set DMA device max segment size parameter Serge Semin
2020-07-09 22:45 ` [PATCH v7 08/11] dmaengine: dw: Add dummy device_caps callback Serge Semin
2020-07-10  8:51   ` Andy Shevchenko
2020-07-10  8:52     ` Andy Shevchenko
2020-07-10  9:45     ` Serge Semin
2020-07-15 12:01       ` Vinod Koul
2020-07-09 22:45 ` [PATCH v7 09/11] dmaengine: dw: Initialize min and max burst DMA device capability Serge Semin
2020-07-09 22:45 ` [PATCH v7 10/11] dmaengine: dw: Introduce max burst length hw config Serge Semin
2020-07-09 22:45 ` [PATCH v7 11/11] dmaengine: dw: Initialize max_sg_nents capability Serge Semin

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