From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CD61ECDE20 for ; Wed, 11 Sep 2019 08:25:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6045A2085B for ; Wed, 11 Sep 2019 08:25:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="A5l35yhM"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=microchiptechnology.onmicrosoft.com header.i=@microchiptechnology.onmicrosoft.com header.b="JRiFP/7V" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6045A2085B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=microchip.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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:In-Reply-To:References: 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=og+u7nwXn2mD7Y4c2xwZLTYw5dqSHfGBD83lwT2FbNo=; b=A5l35yhMtzZRyl N+NpwXfPKy7EkmyfwbyPbuJZ6hUhaDEuHGUUTcMHtlXjek0iA2jvX4/gu4CZPZ4d46ps6kZG6XQ1P C7TaKQ7Gm3CzPYrR6jAKixTtZ8gzJxE7S7DDP/iR1IpBWbSUGkQXwl77IIV8iCBsB3nP2JhgACVwb SoVaso3mtlsPTP0WIUbqVJ2Xuf4sgnotDd0vhFRHUEQV7brWJnkjGtaDf46v6pT2UYHoWDf/ZStEQ /6WwyAzSw74//wjzYMHbx1vtGDQh6WRqOLGRFSCIjlq0TuolOfNZiy+TtcFBkihuPKuNdap5/nNDf tzhgoeM4YdNzDgxGO1jg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i7xwW-0006CC-SD; Wed, 11 Sep 2019 08:25:37 +0000 Received: from esa2.microchip.iphmx.com ([68.232.149.84]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i7xvV-00045A-PU for linux-arm-kernel@lists.infradead.org; Wed, 11 Sep 2019 08:24:35 +0000 Received-SPF: Pass (esa2.microchip.iphmx.com: domain of Eugen.Hristev@microchip.com designates 198.175.253.82 as permitted sender) identity=mailfrom; client-ip=198.175.253.82; receiver=esa2.microchip.iphmx.com; envelope-from="Eugen.Hristev@microchip.com"; x-sender="Eugen.Hristev@microchip.com"; x-conformance=spf_only; x-record-type="v=spf1"; x-record-text="v=spf1 mx a:ushub1.microchip.com a:smtpout.microchip.com a:mx1.microchip.iphmx.com a:mx2.microchip.iphmx.com include:servers.mcsv.net include:mktomail.com include:spf.protection.outlook.com ~all" Received-SPF: None (esa2.microchip.iphmx.com: no sender authenticity information available from domain of postmaster@email.microchip.com) identity=helo; client-ip=198.175.253.82; receiver=esa2.microchip.iphmx.com; envelope-from="Eugen.Hristev@microchip.com"; x-sender="postmaster@email.microchip.com"; x-conformance=spf_only Authentication-Results: esa2.microchip.iphmx.com; spf=Pass smtp.mailfrom=Eugen.Hristev@microchip.com; spf=None smtp.helo=postmaster@email.microchip.com; dkim=pass (signature verified) header.i=@microchiptechnology.onmicrosoft.com; dmarc=pass (p=none dis=none) d=microchip.com IronPort-SDR: rX4nhMPin3s1XsNPmDcrBNiaB5AfIux3ljYsrYo+SdT+KTY5THs5S9BCnkC7u7zOvkX5LASvhV Z0XfTlr9UvDt20JrsoPXp0wL+VEKSTiVRG/NiAndFWL5BpevZmb2gvgJ3PqbxD1PPE/NXqNpn3 YY/tXUNzdEMdw3A9COsCsky28Bf60AvdhuQJb5MlGucya+ahPs1MYDQp1FWSvmnPFWPNi4Qbs2 KtrYV0TnD11wt+DtsdpZXMGTrPamlvgtMy/L4CEbEOzSLcByjkDfih0FWnhgG3TGXv/nYtJYzt VJY= X-IronPort-AV: E=Sophos;i="5.64,492,1559545200"; d="scan'208";a="48478475" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 11 Sep 2019 01:24:21 -0700 Received: from chn-vm-ex01.mchp-main.com (10.10.85.143) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 11 Sep 2019 01:24:21 -0700 Received: from NAM02-SN1-obe.outbound.protection.outlook.com (10.10.215.89) by email.microchip.com (10.10.87.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5 via Frontend Transport; Wed, 11 Sep 2019 01:24:20 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=PZiL3hpnjqZG8X719hi7G3Gkj2vmuqQ22phRqOhR4VUYQLJOEXrUYxSHhETxPOIHjLGRqf5TMVXdjtP1uCg18KXcKqaA4zWcxh5VH9B/BHC+AQl4nGeGGh+gLtEdCXGtNyoSWw3giQg9AyO0pZDo3OJoi+n9wZ82xgfRTju8DS50YN+mn3CdouwExV1ooqUg9zhFl7L8vyWtIhYJnH242aGaQCJYrtvrliwrjo+8AAVNH5QU+D8yubCwBRSHxbB5GY/lr9TdPIp267rsDZEXyPf5ntokBAAQVxq7igZIOjlKlQA9pL2nCMSZt7/LXaeRprRg1OJdPW4C9kq/VfIX1w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MXZGz96MmEkN5dZzYYAjNgFn+FtkW43FTvVIA4U8MwQ=; b=hgGbLRVB7SesWnKByZvYQvRxms1/as4UJERrsuFiv2VURLegBPawMLKtFyfobmup9903jyIO5deDgclVwYd8CX67rNt1dPPwo322zzXC7f7zvh2trDko9V+gjo1MCKEV1FDSNscJhpipSbJN2J1RBUf8RNMU2SZCiT4O7g4N1UpKxInHJML7bepXsI6JP4gkE7zMgwlejhGEDH8y0zglhT17zPz4MUusDXpsmHgMguONFCt6rFXDq2SNEAniWFupkhoe8DaDj740/3C2ZxuAyMMf8gRuQrjzO3XOLzTavfLQck6OVMQ001MFHD3zt3B36EH8veqhAua1c8+5jpSSGQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microchip.com; dmarc=pass action=none header.from=microchip.com; dkim=pass header.d=microchip.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microchiptechnology.onmicrosoft.com; s=selector2-microchiptechnology-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MXZGz96MmEkN5dZzYYAjNgFn+FtkW43FTvVIA4U8MwQ=; b=JRiFP/7V5tyxC8XLN0TnHE/dyTeSszcvMH90HAIjA7FQp6Lfz+OErN5kcp+u+9u/d7jqvQdrJHQx8BInQUvs09APKF/z3VuFyV72Kqe0+SgpEyrPy1nxhdeLU/nhYh3PbtqW53+0uM4mBkAIQx0XKiPubJMNZZWJXd/GZN1teuk= Received: from DM5PR11MB1242.namprd11.prod.outlook.com (10.168.108.8) by DM5PR11MB1452.namprd11.prod.outlook.com (10.172.36.135) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2241.18; Wed, 11 Sep 2019 08:24:20 +0000 Received: from DM5PR11MB1242.namprd11.prod.outlook.com ([fe80::a141:1974:9668:fbe2]) by DM5PR11MB1242.namprd11.prod.outlook.com ([fe80::a141:1974:9668:fbe2%12]) with mapi id 15.20.2241.018; Wed, 11 Sep 2019 08:24:20 +0000 From: To: , , , , , , , , , Subject: [PATCH v5 2/9] dt-bindings: i2c: add bindings for i2c analog and digital filter Thread-Topic: [PATCH v5 2/9] dt-bindings: i2c: add bindings for i2c analog and digital filter Thread-Index: AQHVaHpPW8l4X5Kqx0mXlxkiy0GaLA== Date: Wed, 11 Sep 2019 08:24:20 +0000 Message-ID: <1568189911-31641-3-git-send-email-eugen.hristev@microchip.com> References: <1568189911-31641-1-git-send-email-eugen.hristev@microchip.com> In-Reply-To: <1568189911-31641-1-git-send-email-eugen.hristev@microchip.com> Accept-Language: en-US, ro-RO Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: VI1P189CA0008.EURP189.PROD.OUTLOOK.COM (2603:10a6:802:2a::21) To DM5PR11MB1242.namprd11.prod.outlook.com (2603:10b6:3:14::8) x-mailer: git-send-email 2.7.4 x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [94.177.32.156] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d918bab3-f1c0-4257-4a4a-08d736917184 x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(2017052603328)(7193020); SRVR:DM5PR11MB1452; x-ms-traffictypediagnostic: DM5PR11MB1452: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; x-forefront-prvs: 0157DEB61B x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(346002)(376002)(39860400002)(396003)(366004)(136003)(189003)(199004)(52116002)(3846002)(2501003)(66556008)(66476007)(66946007)(54906003)(110136005)(478600001)(25786009)(316002)(6436002)(6116002)(76176011)(66066001)(386003)(14454004)(2906002)(102836004)(486006)(476003)(2616005)(11346002)(446003)(6506007)(186003)(26005)(4326008)(8936002)(81166006)(81156014)(7736002)(66446008)(8676002)(5660300002)(50226002)(64756008)(86362001)(2201001)(99286004)(71190400001)(71200400001)(53936002)(36756003)(256004)(107886003)(6512007)(305945005)(6486002)(921003)(1121003); DIR:OUT; SFP:1101; SCL:1; SRVR:DM5PR11MB1452; H:DM5PR11MB1242.namprd11.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: microchip.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: XXB8dROqTagHFwLtyDf9+/Ur31S71JwqRYP/AeaFknObJp35jtl6anI5prxjNGLv6KEsNoEQ3jNRSAT57HDQ8YbpLiF+r/RBWQWKBXYMvpL1xXbcw2fJGlsEBO2PvGaGXNgnbymEqwB8ZZYvUbufB2tCJ6p+tNpztE3rp5d7/i2RC9S2Rvj2a1LKtwmyrQ8KSiKvso0CEUnQA3R5vevqYU8lP7JKyQWhiDMbprrwOTGrI/6vidLDC3EYL+dfF9ypYY3yzg+ZgJtApgbPJzSGlzMuDTLfICFHN/IaRuQX4itkqu8/w+2luKEHDWqsVd/yEKmOohyAtXRmAe+aBF+DxnDPfXQxeruV2Q8GrrZTKKGm/3yJCl+7pdluLGnmwwLWIic3Z/7T7RDdQGb+DygPlzlxeivVBqVDXtxj5D2lDvA= MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: d918bab3-f1c0-4257-4a4a-08d736917184 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2019 08:24:20.1156 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 3UG3liKMupN/pX91OXF1TsaBXzIKTWbzghD8Ri5ooIJKQHpn3p4nlv95xBjP+HDzrCR1ajB3Kc2sbqtCBagPUP9CY4RUi+KHEl6+Jv/ZmPw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR11MB1452 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190911_012433_882668_D86D0A00 X-CRM114-Status: UNSURE ( 8.92 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eugen.Hristev@microchip.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Eugen Hristev Some i2c controllers have a built-in digital or analog filter. This is specifically required depending on the hardware PCB/board. Some controllers also allow specifying the maximum width of the spikes that can be filtered for digital filter. The width length can be specified in nanoseconds. Analog filters can be configured to have a cutoff frequency (low-pass filter). This frequency can be specified in Hz. Added an optional property for such types of analog filters. Signed-off-by: Eugen Hristev --- Documentation/devicetree/bindings/i2c/i2c.txt | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt index 44efafd..9a53df4 100644 --- a/Documentation/devicetree/bindings/i2c/i2c.txt +++ b/Documentation/devicetree/bindings/i2c/i2c.txt @@ -55,6 +55,24 @@ wants to support one of the below features, it should adapt the bindings below. Number of nanoseconds the SDA signal takes to fall; t(f) in the I2C specification. +- i2c-analog-filter + Enable analog filter for i2c lines. + +- i2c-digital-filter + Enable digital filter for i2c lines. + +- i2c-digital-filter-width-ns + Width of spikes which can be filtered by digital filter + (i2c-digital-filter). This width is specified in nanoseconds. + +- i2c-analog-filter-cutoff-frequency + Frequency that the analog filter (i2c-analog-filter) uses to distinguish + which signal to filter. Signal with higher frequency than specified will + be filtered out. Only lower frequency will pass (this is applicable to + a low-pass analog filter). Typical value should be above the normal + i2c bus clock frequency (clock-frequency). + Specified in Hz. + - interrupts interrupts used by the device. -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel