From: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
To: Vinod Koul <vkoul@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Masami Hiramatsu <masami.hiramatsu@linaro.org>,
Jassi Brar <jaswinder.singh@linaro.org>,
Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Subject: [PATCH 1/2] dt-bindings: dmaengine: Add UniPhier external DMA controller bindings
Date: Wed, 18 Dec 2019 09:56:59 +0900 [thread overview]
Message-ID: <1576630620-1977-2-git-send-email-hayashi.kunihiko@socionext.com> (raw)
In-Reply-To: <1576630620-1977-1-git-send-email-hayashi.kunihiko@socionext.com>
Add external DMA controller bindings implemented in Socionext UniPhier
SoCs.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
---
.../devicetree/bindings/dma/uniphier-xdmac.txt | 86 ++++++++++++++++++++++
1 file changed, 86 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/uniphier-xdmac.txt
diff --git a/Documentation/devicetree/bindings/dma/uniphier-xdmac.txt b/Documentation/devicetree/bindings/dma/uniphier-xdmac.txt
new file mode 100644
index 00000000..4e3927f
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/uniphier-xdmac.txt
@@ -0,0 +1,86 @@
+Socionext UniPhier external DMA controller bindings
+
+This describes the devicetree bindings for an external DMA engine to perform
+memory-to-memory or peripheral-to-memory data transfer, implemented in
+Socionext UniPhier SoCs.
+
+* DMA controller
+
+Required properties:
+- compatible: Should be "socionext,uniphier-xdmac".
+- reg: Specifies offset and length of the register set for the device.
+- interrupts: An interrupt specifier associated with the DMA controller.
+- #dma-cells: Must be <2>. The first cell represents the channel index.
+ The second cell represents the factor for transfer request.
+ This is mentioned in DMA client section.
+- dma-channels : Number of DMA channels supported. Should be 16.
+
+Example:
+ xdmac: dma-controller@5fc10000 {
+ compatible = "socionext,uniphier-xdmac";
+ reg = <0x5fc10000 0x1000>, <0x5fc20000 0x800>;
+ interrupts = <0 188 4>;
+ #dma-cells = <2>;
+ dma-channels = <16>;
+ };
+
+* DMA client
+
+Required properties:
+- dmas: A list of DMA channel requests.
+- dma-names: Names of the requested channels corresponding to dmas.
+
+DMA clients must use the format described in the dma.txt file, using a two cell
+specifier for each channel.
+
+Each DMA request consists of 3 cells:
+ 1. A phandle pointing to the DMA controller
+ 2. Channel index
+ 3. Transfer request factor number, If no transfer factor, use 0.
+ The number is SoC-specific, and this should be specified with relation
+ to the device to use the DMA controller. The list of the factor number
+ can be found below.
+
+ 0x0 none
+ 0x8 UART ch0 Rx
+ 0x9 UART ch0 Tx
+ 0xa UART ch1 Rx
+ 0xb UART ch1 Tx
+ 0xc UART ch2 Rx
+ 0xd UART ch2 Tx
+ 0xe UART ch3 Rx
+ 0xf UART ch3 Tx
+ 0x14 SCSSI ch1 Rx
+ 0x15 SCSSI ch1 Tx
+ 0x16 SCSSI ch0 Rx
+ 0x17 SCSSI ch0 Tx
+ 0x18 SCSSI ch2 Rx
+ 0x19 SCSSI ch2 Tx
+ 0x1a SCSSI ch3 Rx
+ 0x1b SCSSI ch3 Tx
+ 0x21 I2C ch0 Rx
+ 0x22 I2C ch0 Tx
+ 0x23 I2C ch1 Rx
+ 0x24 I2C ch1 Tx
+ 0x25 I2C ch2 Rx
+ 0x26 I2C ch2 Tx
+ 0x27 I2C ch3 Rx
+ 0x28 I2C ch3 Tx
+ 0x29 I2C ch4 Rx
+ 0x2a I2C ch4 Tx
+ 0x2b I2C ch5 Rx
+ 0x2c I2C ch5 Tx
+ 0x2d I2C ch6 Rx
+ 0x2e I2C ch6 Tx
+
+Example:
+ spi3: spi@54006300 {
+ compatible = "socionext,uniphier-scssi";
+ reg = <0x54006300 0x100>;
+ interrupts = <0 39 4>;
+ clocks = <&peri_clk 14>;
+ resets = <&peri_rst 14>;
+
+ dmas = <&xdmac 0 0x1a>, <&xdmac 1 0x1b>;
+ dma-names = "rx", "tx";
+ };
--
2.7.4
next prev parent reply other threads:[~2019-12-18 0:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 0:56 [PATCH 0/2] dmaengine: Add UniPhier XDMAC driver Kunihiko Hayashi
2019-12-18 0:56 ` Kunihiko Hayashi [this message]
2020-01-08 3:55 ` [PATCH 1/2] dt-bindings: dmaengine: Add UniPhier external DMA controller bindings Rob Herring
2020-01-09 12:20 ` Kunihiko Hayashi
2019-12-18 0:57 ` [PATCH 2/2] dmaengine: uniphier-xdmac: Add UniPhier external DMA controller driver Kunihiko Hayashi
2019-12-27 6:34 ` Vinod Koul
2020-01-09 12:12 ` Kunihiko Hayashi
2020-01-10 8:01 ` Vinod Koul
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