linux-kernel - [PATCH v2 1/5] dt-bindings: Document the STM32 DMAMUX bindings

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Date:   Fri, 23 Jun 2017 15:00:49 +0200
From:   Pierre-Yves MORDRET <pierre-yves.mordret@...com>
To:     Vinod Koul <vinod.koul@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        Dan Williams <dan.j.williams@...el.com>,
        "M'boumba Cedric Madianga" <cedric.madianga@...il.com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Fabien DESSENNE <fabien.dessenne@...com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        <dmaengine@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/5] dt-bindings: Document the STM32 DMAMUX bindings

This patch adds the documentation of device tree bindings for the STM32
DMAMUX.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@...il.com>
Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>
---
 Version history:
    v2:
        * Move clock bindings from optional to mandatory one
        * Drop channelID bindings as managed dynamically from now on by
          DMAMUX driver.
---
---
 .../devicetree/bindings/dma/stm32-dmamux.txt       | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/stm32-dmamux.txt

diff --git a/Documentation/devicetree/bindings/dma/stm32-dmamux.txt b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt
new file mode 100644
index 0000000..1d413c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt
@@ -0,0 +1,57 @@
+STM32 DMA MUX (DMA request router)
+
+Required properties:
+- compatible:	"st,stm32-dmamux"
+- reg:		Memory map for accessing module
+- #dma-cells:	Should be set to <3>.
+		For more details about the three cells, please see
+		stm32-dma.txt documentation binding file
+- dma-masters:	Phandle pointing to the DMA controller
+
+Optional properties:
+- dma-channels : Number of DMA channels supported.
+- dma-requests : Number of DMA requests supported.
+- resets: Reference to a reset controller asserting the DMA controller
+- clocks: Input clock of the DMAMUX instance.
+
+Example:
+
+/* DMA controller */
+dma2: dma-controller@...26400 {
+	compatible = "st,stm32-dma";
+	reg = <0x40026400 0x400>;
+	interrupts = <56>,
+		     <57>,
+		     <58>,
+		     <59>,
+		     <60>,
+		     <68>,
+		     <69>,
+		     <70>;
+	clocks = <&clk_hclk>;
+	#dma-cells = <4>;
+	st,mem2mem;
+	resets = <&rcc 150>;
+	st,dmamux;
+	dma-channels = <8>;
+};
+
+/* DMA mux */
+dmamux2: dma-router@...20820 {
+	compatible = "st,stm32-dmamux";
+	reg = <0x40020800 0x1c>;
+	#dma-cells = <3>;
+	dma-requests = <128>;
+	dma-masters = <&dma2>;
+};
+
+/* DMA client */
+usart1: serial@...11000 {
+	compatible = "st,stm32-usart", "st,stm32-uart";
+	reg = <0x40011000 0x400>;
+	interrupts = <37>;
+	clocks = <&clk_pclk2>;
+	dmas = <&dmamux2 41 0x414 0>,
+	       <&dmamux2 42 0x414 0>;
+	dma-names = "rx", "tx";
+};
-- 
1.9.1