From patchwork Fri Mar 31 11:45:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrice Gasnier X-Patchwork-Id: 9656065 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 03F7F60351 for ; Fri, 31 Mar 2017 11:46:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E7E21284F7 for ; Fri, 31 Mar 2017 11:46:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DBE2328654; Fri, 31 Mar 2017 11:46:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 25985284F7 for ; Fri, 31 Mar 2017 11:46:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=MxE4QUtGtUIuxhBs+3A3fhQAmtkQ/7aQLBC86gyqhF0=; b=OdMBTEyVk6QBla Nl55D/Towk6OOlr2XDvOcsEDqJVhkwfUp0pNem72IijHhtqwM6H+HtD/r2oljNKfOBUkFnZoFwPeY iuE70soXvgAvhCjfeycyZonYiBGD1Sh4rWD8VOgFMHucC08Fy3fcUEr+rIIkLoXJFuimvl62oseiz y1iBNaPB/lI4euaiCZ5s//+RkhvoIyXQrKSFaMYYA+5/lR2sLd8WbzlJaZCE7kANtTKj/JF9NUyNF jU0Sb48/BMYX9mXlTHvYERoIxwrQSLPWWdWEj3U20aiKi5a8ktGUYOm500bwFzEaLoW465SmqP21q iG66qs1tf9QnP8tiU27Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1ctv0U-00016B-RK; Fri, 31 Mar 2017 11:46:18 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1ctv0Q-000148-WA for linux-arm-kernel@lists.infradead.org; Fri, 31 Mar 2017 11:46:17 +0000 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by m0046037.ppops.net (8.16.0.11/8.16.0.11) with SMTP id v2VBhi6V005128; Fri, 31 Mar 2017 13:45:30 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-.pphosted.com with ESMTP id 29h2kap90y-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 31 Mar 2017 13:45:30 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E677434; Fri, 31 Mar 2017 11:45:29 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node3.st.com [10.75.127.15]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B0A9628AF; Fri, 31 Mar 2017 11:45:29 +0000 (GMT) Received: from localhost (10.75.127.47) by SFHDAG5NODE3.st.com (10.75.127.15) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Fri, 31 Mar 2017 13:45:29 +0200 From: Fabrice Gasnier To: , , , , , Subject: [PATCH 1/4] dt-bindings: iio: stm32-dac: Add support for STM32 DAC Date: Fri, 31 Mar 2017 13:45:04 +0200 Message-ID: <1490960707-22422-2-git-send-email-fabrice.gasnier@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1490960707-22422-1-git-send-email-fabrice.gasnier@st.com> References: <1490960707-22422-1-git-send-email-fabrice.gasnier@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG4NODE2.st.com (10.75.127.11) To SFHDAG5NODE3.st.com (10.75.127.15) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-03-31_11:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170331_044615_370240_0BA67DF6 X-CRM114-Status: GOOD ( 10.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, benjamin.gaignard@linaro.org, lars@metafoo.de, alexandre.torgue@st.com, linux-iio@vger.kernel.org, pmeerw@pmeerw.net, amelie.delaunay@st.com, mcoquelin.stm32@gmail.com, knaack.h@gmx.de, fabrice.gasnier@st.com, linus.walleij@linaro.org, benjamin.gaignard@st.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Document STMicroelectronics STM32 DAC (digital-to-analog converter). Signed-off-by: Fabrice Gasnier --- .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 56 ++++++++++++++++++++++ 1 file changed, 56 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..1981983 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt @@ -0,0 +1,56 @@ +STMicroelectronics STM32 DAC + +The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC +can be configured in 8- or 12-bit mode. In 12-bit mode, the data could be +left- or right-aligned. 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. + +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". +- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in + Documentation/devicetree/bindings/iio/iio-bindings.txt +- st,dac-channel: Must be either 1 or 2, to define channel in use (e.g. + single channels: 1 or 2) + +Example: + dac: dac@40007400 { + compatible = "st,stm32h7-dac-core"; + reg = <0x40007400 0x400>; + clocks = <&clk>; + clock-names = "pclk"; + vref-supply = <®_vref>; + + dac1: dac@1 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + st,dac-channel = <1>; + }; + + dac2: dac@2 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + st,dac-channel = <2>; + }; + };