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During the calibration process vrefp is set to 3.3V and the data acquired is saved to the OTP. This data is used by the ADC driver to calculated the actual value of vrefp according to the formula: vrefp = 3.3 x vrefint_cal / vrefint_data The vrefint channel provides the actual value of vrefp, which can be used to correct ADC acquisition data. Signed-off-by: Olivier Moysan --- arch/arm/boot/dts/stm32mp151.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi index 3d0c39d847b5..61508917521c 100644 --- a/arch/arm/boot/dts/stm32mp151.dtsi +++ b/arch/arm/boot/dts/stm32mp151.dtsi @@ -1113,6 +1113,8 @@ adc2: adc@100 { interrupts = <1>; dmas = <&dmamux1 10 0x400 0x01>; dma-names = "rx"; + nvmem-cells = <&vrefint>; + nvmem-cell-names = "vrefint"; status = "disabled"; channel@13 { reg = <13>; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA756C7EE2C for ; Tue, 30 May 2023 12:48:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232290AbjE3MsW (ORCPT ); Tue, 30 May 2023 08:48:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230305AbjE3MsT (ORCPT ); Tue, 30 May 2023 08:48:19 -0400 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35D91A3; Tue, 30 May 2023 05:47:46 -0700 (PDT) Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34UC5UDX018243; Tue, 30 May 2023 14:47:16 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=selector1; bh=Tvfrm/SClKPXJ+Bcvot4iUqoxk3JAMST0yYmkqmtgDs=; b=guAo0Ke2/Oq/rND0RKy/3TQx2FlloTnvBGidgmd8uAaa1l5qrb5K9VllqEII91m3Zx4B MN7Y+uUi5y64wuj/cittyNy0LkqIughbvJiohfBDDAfjETQHUPl/9di/INkmMDjsKZm/ mXY9Zh1R7cw2tOUwLZwPRAN83LIieNLxDQaRKkqCoew7GRQZ/OhmNSTOyPigM9WBjTai TUsd5IFw3w59mhkO0lunEUFTczyR/czlmLAziiYmKwO1Ty1lG/Qg9UxzN0jPlYFBTSPh 6edPhiWCBvaTFjA/6eNiKq3zuvhizVZnVDom90tl3KedUczEvQk9p0OWPtIQ7ePe0kp+ rA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3qwdm5hs5f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 May 2023 14:47:16 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 255F410002A; Tue, 30 May 2023 14:47:16 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 1E2A52248D6; Tue, 30 May 2023 14:47:16 +0200 (CEST) Received: from localhost (10.201.20.178) 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 15.1.2507.21; Tue, 30 May 2023 14:47:15 +0200 From: Olivier Moysan To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue CC: Olivier Moysan , , , , Subject: [PATCH v2 3/9] ARM: dts: stm32: add vrefint support to adc2 on stm32mp15 Date: Tue, 30 May 2023 14:45:31 +0200 Message-ID: <20230530124538.621760-4-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230530124538.621760-1-olivier.moysan@foss.st.com> References: <20230530124538.621760-1-olivier.moysan@foss.st.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.201.20.178] 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:2.0.205,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-30_09,2023-05-30_01,2023-05-22_02 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Set STM32 ADC2 as a consumer of BSEC on STM32MP15, to retrieve vrefint calibration data saved in OTP. During the calibration process vrefp is set to 3.3V and the data acquired is saved to the OTP. This data is used by the ADC driver to calculated the actual value of vrefp according to the formula: vrefp = 3.3 x vrefint_cal / vrefint_data The vrefint channel provides the actual value of vrefp, which can be used to correct ADC acquisition data. Signed-off-by: Olivier Moysan --- arch/arm/boot/dts/stm32mp151.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi index 3d0c39d847b5..61508917521c 100644 --- a/arch/arm/boot/dts/stm32mp151.dtsi +++ b/arch/arm/boot/dts/stm32mp151.dtsi @@ -1113,6 +1113,8 @@ adc2: adc@100 { interrupts = <1>; dmas = <&dmamux1 10 0x400 0x01>; dma-names = "rx"; + nvmem-cells = <&vrefint>; + nvmem-cell-names = "vrefint"; status = "disabled"; channel@13 { reg = <13>; -- 2.25.1