From patchwork Wed Jul 24 15:36:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olivier Moysan X-Patchwork-Id: 13741111 Received: from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com [185.132.182.106]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B963D15B102; Wed, 24 Jul 2024 15:39:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.132.182.106 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721835564; cv=none; b=FViihi/3FATzxLbKAx/oWsYrsz+U+zktccAWJUe9TdOWikXHiAMFdtIi2yVX376jjEsYWbcFA6T4FCUtLrSVx2tqjKu11mMa4FKe4hiCxM4NaZiHffvnzVyXHddi9gQQcw8KfIEJDCXxObiRTF4Lpr3Xb6pyh1evA1JMYLdO564= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721835564; c=relaxed/simple; bh=yeQfMN7yreKLnANCDTFSWDaOwTj4sS65J0sKMCzIxVk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GXZHI2QcS65xI2cukZOpEJyX50lmDDCKdLaDvj7bhAW0OkQB9MTDg5DsZPBqamq5aqBJ4PWijrkXNDkBx39zat//aeODc+rbheWp9QGzjthnXFua5jV4/mvI9tI5+FSRCILHgjICIAdzKo33WPaAmbf3PqVJMzhQMdCGyb5UJx8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com; spf=pass smtp.mailfrom=foss.st.com; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b=IQB3RJHv; arc=none smtp.client-ip=185.132.182.106 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foss.st.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b="IQB3RJHv" Received: from pps.filterd (m0369458.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 46OBxQ4Z007183; Wed, 24 Jul 2024 17:39:09 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=selector1; bh= L/C9dHL921+AiIjkcSXro2gpQoD393DjMVEmput5l44=; b=IQB3RJHvYXrc/tf9 YE+ZF0MGxykUYkwDM1oEx3n8U+SxHACF35UZAQThJHPh7wOQ02TADEanHZJy4atE xo2sfwlv1Epd4/l3+Mf553I3hVy/UXrc/ZvgHLFYwpKnwEEJO6HN9ausoObYQkP7 3bn54R01iSiPA2Nemdu3DCZ81FaPhRG+tGthnXa9UmYIin1XmDqxGS8H0KwVFQqS vo6qm8u7ExpPY1zGldogZJYolikSDw6ZXCg5s33YmfxBhHlcy8WNutpXTYMbD/qF ukMP3Pq3+ZkDsS21QiG269as3euAY3Jb4hej+bz5VBRfN/6xgXcoMZCt0ZPe2SB1 O6C3Dg== Received: from beta.dmz-ap.st.com (beta.dmz-ap.st.com [138.198.100.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 40gpt16a12-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 24 Jul 2024 17:39:09 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 407F940045; Wed, 24 Jul 2024 17:39:05 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 00B2A2414BC; Wed, 24 Jul 2024 17:38:33 +0200 (CEST) Received: from localhost (10.252.12.39) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.37; Wed, 24 Jul 2024 17:38:32 +0200 From: Olivier Moysan To: , Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arnaud Pouliquen CC: Olivier Moysan , , , Subject: [PATCH v5 5/9] dt-bindings: iio: add backend support to sd modulator Date: Wed, 24 Jul 2024 17:36:33 +0200 Message-ID: <20240724153639.803263-6-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240724153639.803263-1-olivier.moysan@foss.st.com> References: <20240724153639.803263-1-olivier.moysan@foss.st.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EQNCAS1NODE3.st.com (10.75.129.80) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-24_15,2024-07-24_01,2024-05-17_01 The legacy sd modulator driver registers the sigma delta modulator as an IIO channel provider. This implementation is not convenient when the SD modulator has to be cascaded with another IIO device. The scaling information is distributed across devices, which makes it difficult to report consistent scaling data on IIO devices. The solution is to expose these cascaded IIO devices as an aggregate device, which report global scaling information. Add IIO backend support to SD modulator to allow scaling information management. Signed-off-by: Olivier Moysan --- .../bindings/iio/adc/sigma-delta-modulator.yaml | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml index cab0d425eaa4..b245971fecb0 100644 --- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml +++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml @@ -18,18 +18,31 @@ properties: - sd-modulator - ads1201 + '#io-backend-cells': + const: 0 + '#io-channel-cells': const: 0 required: - compatible - - '#io-channel-cells' + +anyOf: + - required: ['#io-backend-cells'] + - required: ['#io-channel-cells'] additionalProperties: false examples: - | - ads1202: adc { + // Backend binding example. SD modulator configured as an IIO backend device + ads1201_0 { + compatible = "sd-modulator"; + #io-backend-cells = <0>; + }; + + // Legacy binding example. SD modulator configured as an IIO channel provider + ads1201_1 { compatible = "sd-modulator"; #io-channel-cells = <0>; };