From patchwork Tue Jul 30 08:46:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olivier Moysan X-Patchwork-Id: 13747058 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 50B89193081; Tue, 30 Jul 2024 08:48:50 +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=1722329332; cv=none; b=j5fZsnBsRjJkBsZlUcy+oCSof7a+6J8e4OsLX4dQDpmRTINu32HdMIakj4/b5hN1WHwgozeIQ3qIMq2p/Kc5yLTssUQs0bC6HlsDnMvdw6TBZLf/sM4AXC/JjY6wE7L743EDGtA+w1w+QBF7cCix91lY1jyft9wzhT9jMugPldQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722329332; c=relaxed/simple; bh=ffmDdoUjgHPvg4ewDokiYbFtdZGQEaM/ClDFB8mPSRQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qiEDI2bYmFmcuZx7ssd4uQbx+cDhjPp2jtqZeL/E0HBXAwrNXjMCkoae3Mv+v0PlpeKPx9TzqD9Wu5p1J+Mvfbm/rJK9pgSgVcjLiO2afMtP2JsuyojKhfN4niCbEioK33HBrL5GiPlkiZovwJCLBCAKDCMmRjRs5/zKkvAs+3I= 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=NO5CVZv+; 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="NO5CVZv+" Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 46U6J18G032156; Tue, 30 Jul 2024 10:48:24 +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= pOMnBCNMQO6/J87ZVDIkr7Z67cShz0Qbz+Wxsr7PkWI=; b=NO5CVZv+Fq9f7Rni 6LaGzbbTHPqZsONijyuK62ssDKVZZxgmBpQ+Km1GAy32CpkaJUsL2MA5KxiD0GDe L6DnpFZfvEfD/427J/wxrj4Fm23nJCEkJamUPFv5F/TrllrnyLP1OmY3Np+yBQPC +gIWgxPBiI5ItHpG7/Emr5HB7hfAOSHhsjz0GJs88alu/Ojqj/p9iAR2GUAQIRQV Qs3lwUppUthxgAVwiWBIAtXG+1K6i8otOD1qwCH24Tl+WHMV6VMcN2va8ZVQo21I sR6Lg7hLtbszuESmeXCTY2MEFCnRDuaJ1T4EugiH4EbxW1HvMiODIy6ym7o4sAbK Jf/j4Q== 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 40mr7wus53-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Jul 2024 10:48:24 +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 C68AE40047; Tue, 30 Jul 2024 10:48:20 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 8473A21ADC6; Tue, 30 Jul 2024 10:48:20 +0200 (CEST) Received: from localhost (10.252.3.32) 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; Tue, 30 Jul 2024 10:48:20 +0200 From: Olivier Moysan To: , Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arnaud Pouliquen CC: Olivier Moysan , , , Subject: [PATCH v6 5/9] dt-bindings: iio: add backend support to sd modulator Date: Tue, 30 Jul 2024 10:46:35 +0200 Message-ID: <20240730084640.1307938-6-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240730084640.1307938-1-olivier.moysan@foss.st.com> References: <20240730084640.1307938-1-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=2024-07-30_09,2024-07-26_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 Reviewed-by: Rob Herring (Arm) --- .../iio/adc/sigma-delta-modulator.yaml | 18 ++++++++++++++++-- 1 file changed, 16 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..7d33c4e09905 100644 --- a/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml +++ b/Documentation/devicetree/bindings/iio/adc/sigma-delta-modulator.yaml @@ -18,18 +18,32 @@ 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: adc { + compatible = "sd-modulator"; + #io-backend-cells = <0>; + }; + + - | + // Legacy binding example. SD modulator configured as an IIO channel provider + ads1201_1: adc { compatible = "sd-modulator"; #io-channel-cells = <0>; };