From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933942AbdDFQNk (ORCPT ); Thu, 6 Apr 2017 12:13:40 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:45694 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933818AbdDFQNH (ORCPT ); Thu, 6 Apr 2017 12:13:07 -0400 From: Fabrice Gasnier To: , , , , , CC: , , , , , , , , , Subject: [PATCH v2 1/5] dt-bindings: iio: stm32-dac: Add support for STM32 DAC Date: Thu, 6 Apr 2017 18:11:52 +0200 Message-ID: <1491495116-7209-2-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1491495116-7209-1-git-send-email-fabrice.gasnier@st.com> References: <1491495116-7209-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.75.127.45] X-ClientProxiedBy: SFHDAG3NODE1.st.com (10.75.127.7) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-06_13:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document STMicroelectronics STM32 DAC (digital-to-analog converter). Signed-off-by: Fabrice Gasnier --- Changes in v2: - use 'reg' instead of 'st,dac-channel' property - remove alignment from description --- .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 61 ++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt diff --git a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt new file mode 100644 index 0000000..bcee71f --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt @@ -0,0 +1,61 @@ +STMicroelectronics STM32 DAC + +The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC +may be configured in 8 or 12-bit mode. It has two output channels, each with +its own converter. +It has built-in noise and triangle waveform generator and supports external +triggers for conversions. The DAC's output buffer allows a high drive output +current. + +Contents of a stm32 dac root node: +----------------------------------- +Required properties: +- compatible: Must be "st,stm32h7-dac-core". +- reg: Offset and length of the device's register set. +- clocks: Must contain an entry for pclk (which feeds the peripheral bus + interface) +- clock-names: Must be "pclk". +- vref-supply: Phandle to the vref+ input analog reference supply. +- #address-cells = <1>; +- #size-cells = <0>; + +Optional properties: +- resets: Must contain the phandle to the reset controller. +- A pinctrl state named "default" for each DAC channel may be defined to set + DAC_OUTx pin in mode of operation for analog output on external pin. + +Contents of a stm32 dac child node: +----------------------------------- +DAC core node should contain at least one subnode, representing a +DAC instance/channel available on the machine. + +Required properties: +- compatible: Must be "st,stm32-dac". +- reg: Must be either 1 or 2, to define (single) channel in use +- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in + Documentation/devicetree/bindings/iio/iio-bindings.txt + +Example: + dac: dac@40007400 { + compatible = "st,stm32h7-dac-core"; + reg = <0x40007400 0x400>; + clocks = <&clk>; + clock-names = "pclk"; + vref-supply = <®_vref>; + pinctrl-names = "default"; + pinctrl-0 = <&dac_out1 &dac_out2>; + #address-cells = <1>; + #size-cells = <0>; + + dac1: dac@1 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + reg = <1>; + }; + + dac2: dac@2 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + reg = <2>; + }; + }; -- 1.9.1