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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id DD4E7F30299 for ; Mon, 16 Mar 2026 03:01:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:CC:To: Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Subject: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=l+pTO17fQOg91UmfjghvNpCstYpEP44DkLaSD/o08/g=; b=e4ULyOmBgPGlvn Ne7KfZ7YHD32FQTJmzj71PcKBjXiIuZ0RE0uq+mnshcO/RliKur93VSSflwODze9vu22t/gvO/3Gq KZj6f+fJr5RRb8lg3w2JuRQZTIfOG2w8fQYK1Gk0jehzX8vHPvOk6MIF7I3+Lv0HFZ/AsLf4/gW/a ZWKAlTAgxs3ckZm8HF6a2WLkU+xUvEi8FO2g9j4XAO06GBy6cTkqfQ74pBfTY0LtXA+w/ISaNb3KL Y+H6YLtaoDmBwPMmlc5j9M/iFJlrg+qcA+K5XbEd55XbEtR414K09cKBbG9rv/YZk1M1bK07U1mcX qIHPq4UHIseWS7bYWTwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w1yCT-00000003F2f-2QPB; Mon, 16 Mar 2026 03:01:01 +0000 Received: from mail.aspeedtech.com ([211.20.114.72] helo=TWMBX01.aspeed.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w1yCQ-00000003F1K-1vNo for linux-arm-kernel@lists.infradead.org; Mon, 16 Mar 2026 03:01:00 +0000 Received: from TWMBX01.aspeed.com (192.168.0.62) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.10; Mon, 16 Mar 2026 11:00:47 +0800 Received: from [127.0.1.1] (192.168.10.13) by TWMBX01.aspeed.com (192.168.0.62) with Microsoft SMTP Server id 15.2.1748.10 via Frontend Transport; Mon, 16 Mar 2026 11:00:47 +0800 From: Billy Tsai Subject: [PATCH v2 0/3] iio: adc: aspeed: Reserve battery sensing channel for on-demand use Date: Mon, 16 Mar 2026 11:00:45 +0800 Message-ID: <20260316-adc-v2-0-21475a217b09@aspeedtech.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAF1yt2kC/1WMQQ7CIBBFr9LMWgxQpKkr72G6GGCUWdg20BBNw 93F7ly+n//eDpkSU4Zrt0OiwpmXuYE+deAjzk8SHBqDltrKXvUCgxdmGJ1EJ0eHBO25Jnrw+6j cp8aR87akzxEt6rf++0UJJQbUFJyhi7XmhnklChv5ePbLC6Za6xepgHuEmwAAAA== X-Change-ID: 20260313-adc-479b0ab09bae To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , "Andy Shevchenko" , Joel Stanley , Andrew Jeffery CC: , , , , , Billy Tsai X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773630047; l=1657; i=billy_tsai@aspeedtech.com; s=20251118; h=from:subject:message-id; bh=7n3XWwQkTSTYZWTGs/j2GKQm8DXZDI2s/DZ4MDmppHY=; b=xvKCj0NDWh80XBGmiwTSZxyraKDRRfynknLqGlG7iXkL/veXU8GCyWp8kw8rfs9DUjr0S5ccP RkU9xMn/VTLCwbEk9pEMJzSI5+c0bkixRI97lp1vxZZVaIddC5Fx+4/ X-Developer-Key: i=billy_tsai@aspeedtech.com; a=ed25519; pk=/A8qvgZ6CPfnwKgT6/+k+nvXOkN477MshEGJvVdzeeQ= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260315_200058_656591_6B5D93E5 X-CRM114-Status: UNSURE ( 7.78 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org For controllers with battery sensing capability (AST2600/AST2700), the last channel uses a different circuit design optimized for battery voltage measurement. This channel should not be enabled by default along with other channels to avoid potential interference and power efficiency issues. Changes made: - Introduce aspeed_adc_get_active_channels() to return the number of channels that should be enabled by default - For battery sensing capable controllers, exclude the last channel from the default channel enable mask - Enable the battery sensing channel only when explicitly accessed via read_raw() - Replace hardcoded channel numbers with ASPEED_ADC_BATTERY_CHANNEL macro - Add helper functions for cleaner channel management This ensures optimal power efficiency for normal ADC operations while maintaining full functionality when battery sensing is needed. Signed-off-by: Billy Tsai --- Changes in v2: - Split the changes into a series of patches for better clarity and review - Link to v1: https://lore.kernel.org/r/20260313-adc-v1-1-7a2edb4e5664@aspeedtech.com --- Billy Tsai (3): iio: adc: Add battery channel definition for ADC iio: adc: Enable multiple consecutive channels based on model data iio: adc: aspeed: Reserve battery sensing channel for on-demand use drivers/iio/adc/aspeed_adc.c | 75 ++++++++++++++++++++++++++++++++++++++------ 1 file changed, 65 insertions(+), 10 deletions(-) --- base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f change-id: 20260313-adc-479b0ab09bae Best regards, -- Billy Tsai