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Date: Wed, 29 Mar 2017 15:25:19 +0200 From: Hugues Fruchet <hugues.fruchet@...com> To: Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil <hverkuil@...all.nl> CC: <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>, Benjamin Gaignard <benjamin.gaignard@...aro.org>, Yannick Fertre <yannick.fertre@...com>, Hugues Fruchet <hugues.fruchet@...com> Subject: [PATCH v1 1/8] dt-bindings: Document STM32 DCMI bindings This adds documentation of device tree bindings for the STM32 DCMI (Digital Camera Memory Interface). Signed-off-by: Hugues Fruchet <hugues.fruchet@...com> --- .../devicetree/bindings/media/st,stm32-dcmi.txt | 77 ++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 Documentation/devicetree/bindings/media/st,stm32-dcmi.txt diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt b/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt new file mode 100644 index 0000000..f0dc709 --- /dev/null +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.txt @@ -0,0 +1,77 @@ +STMicroelectronics STM32 Digital Camera Memory Interface (DCMI) + +Required properties: +- compatible: "st,stm32-dcmi" +- reg: physical base address and length of the registers set for the device; +- interrupts: should contain IRQ line for the DCMI; +- clocks: list of clock specifiers, corresponding to entries in + the clock-names property; +- clock-names: must contain "mclk", which is the DCMI peripherial clock. +- resets: Reference to a reset controller +- reset-names: see Documentation/devicetree/bindings/reset/st,stm32-rcc.txt + +DCMI supports a single port node with parallel bus. It should contain one +'port' child node with child 'endpoint' node. Please refer to the bindings +defined in Documentation/devicetree/bindings/media/video-interfaces.txt. + +Example: + +Device node example +------------------- + dcmi: dcmi@...50000 { + compatible = "st,stm32-dcmi"; + reg = <0x50050000 0x400>; + interrupts = <78>; + resets = <&rcc STM32F4_AHB2_RESET(DCMI)>; + clocks = <&rcc 0 STM32F4_AHB2_CLOCK(DCMI)>; + clock-names = "mclk"; + pinctrl-names = "default"; + pinctrl-0 = <&dcmi_pins>; + dmas = <&dma2 1 1 0x414 0x3>; + dma-names = "tx"; + status = "disabled"; + }; + +Board setup example +------------------- + +&dcmi { + status = "okay"; + + port { + dcmi_0: endpoint@0 { + remote-endpoint = <&ov2640_0>; + bus-width = <8>; + hsync-active = <0>; + vsync-active = <0>; + pclk-sample = <1>; + }; + }; +}; + +{ + [...] + i2c@0 { + ov2640: camera@30 { + compatible = "ovti,ov2640"; + reg = <0x30>; + resetb-gpios = <&stmpegpio 2 GPIO_ACTIVE_HIGH>; + pwdn-gpios = <&stmpegpio 0 GPIO_ACTIVE_LOW>; + clocks = <&clk_ext_camera>; + clock-names = "xvclk"; + status = "okay"; + + port { + ov2640_0: endpoint { + remote-endpoint = <&dcmi_0>; + }; + }; + }; + }; + + clk_ext_camera: clk-ext-camera { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <24000000>; + }; +} -- 1.9.1
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