linux-kernel - [PATCH v3 1/4] dt-bindings: dmaengine: Add binding for Actions Semi Owl SoCs

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Message-Id: <20180726050658.1399-2-manivannan.sadhasivam@linaro.org>
Date:   Thu, 26 Jul 2018 10:36:55 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     vkoul@...nel.org, dan.j.williams@...el.com, afaerber@...e.de,
        robh+dt@...nel.org, dmaengine@...r.kernel.org,
        liuwei@...ions-semi.com, 96boards@...obotics.com,
        devicetree@...r.kernel.org, daniel.thompson@...aro.org,
        amit.kucheria@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, hzhang@...obotics.com,
        bdong@...obotics.com, manivannanece23@...il.com,
        thomas.liau@...ions-semi.com, jeff.chen@...ions-semi.com,
        pn@...x.de, edgar.righi@...tec.org.br
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v3 1/4] dt-bindings: dmaengine: Add binding for Actions Semi Owl SoCs

Add devicetree binding for Actions Semi Owl SoCs DMA controller.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 .../devicetree/bindings/dma/owl-dma.txt       | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/owl-dma.txt

diff --git a/Documentation/devicetree/bindings/dma/owl-dma.txt b/Documentation/devicetree/bindings/dma/owl-dma.txt
new file mode 100644
index 000000000000..03e9bb12b75f
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/owl-dma.txt
@@ -0,0 +1,47 @@
+* Actions Semi Owl SoCs DMA controller
+
+This binding follows the generic DMA bindings defined in dma.txt.
+
+Required properties:
+- compatible: Should be "actions,s900-dma".
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain 4 interrupts shared by all channel.
+- #dma-cells: Must be <1>. Used to represent the number of integer
+              cells in the dmas property of client device.
+- dma-channels: Physical channels supported.
+- dma-requests: Number of DMA request signals supported by the controller.
+                Refer to Documentation/devicetree/bindings/dma/dma.txt
+- clocks: Phandle and Specifier of the clock feeding the DMA controller.
+
+Example:
+
+Controller:
+                dma: dma-controller@...60000 {
+                        compatible = "actions,s900-dma";
+                        reg = <0x0 0xe0260000 0x0 0x1000>;
+                        interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
+                                     <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
+                                     <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
+                                     <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
+                        #dma-cells = <1>;
+                        dma-channels = <12>;
+                        dma-requests = <46>;
+                        clocks = <&clock CLK_DMAC>;
+                };
+
+Client:
+
+DMA clients connected to the Actions Semi Owl SoCs DMA controller must
+use the format described in the dma.txt file, using a two-cell specifier
+for each channel.
+
+The two cells in order are:
+1. A phandle pointing to the DMA controller.
+2. The channel id.
+
+uart5: serial@...2a000 {
+        ...
+        dma-names = "tx", "rx";
+        dmas = <&dma 26>, <&dma 27>;
+        ...
+};
-- 
2.17.1