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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 0EADDCA9EC1 for ; Mon, 28 Oct 2019 07:20:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CB1E421D7F for ; Mon, 28 Oct 2019 07:20:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="v6uDInPr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732605AbfJ1HUM (ORCPT ); Mon, 28 Oct 2019 03:20:12 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:46827 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732649AbfJ1HUL (ORCPT ); Mon, 28 Oct 2019 03:20:11 -0400 Received: by mail-pf1-f194.google.com with SMTP id b25so6266198pfi.13 for ; Mon, 28 Oct 2019 00:20:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=HKtGe92TapQ2KIwqzwkswK8RAIuyaGxBvNdNmUU4dN4=; b=v6uDInPrs2q1qq4SFLLdTjpdDc3eS25cnyOgpZtsm/H1e6dUBVUjCnRTrIW9Je4DLe XqJz6uv+N5YdTtXGCsY5Nwk+YABBQWVqJRGdRpgtWscX0dTeHgTPJbLMsxO2Nn6Hjz3S dbBAmtfdRa2obhR4Db360QfEdyh2kQKCBrXYwvs4DQUeecLSmuAgCNg+8vDcZ+byWbxq kvfNWHa1AXgqxiYlqzAl/rAe0f36GBnVfL8P29Oh6h2SM/31I+Xd91PIcC63SXDmcHIo jZzak31XqYgXmaToPXOP0+62BYK/AyoRWAgahLk4g/uE6jWTpMz8/SETq2QRPAsWDrvB +2AQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=HKtGe92TapQ2KIwqzwkswK8RAIuyaGxBvNdNmUU4dN4=; b=W/7ntJUsWJpL7Up9v9XgspAH5/LcP4zkjITFH5CoVi6rzP9C1Imn3nqg9goO/EL4u4 ZUM3uH8olE0rdtJlcz7Rbcf6d/Xrt1Tky+6zyAtAPn59S+JCzFKwT/J2lX3KplNsqBMy M87o1O53B3lVkLP0fT4cL3h4ikjtERAga+9mgX40f1CGVe7oc+lrhCOL+4rp7fR6+Xz/ HFBtY0p12u8BOwpXyvBMXQnJ5GEfpALGUEXtYPeqgOkdgu0cB8iQYWLv+tnmLNcC0M82 R75mqzELT2IArZ49QL/R7/TrGHz4bIz2qfxjdY51UH1v5Ajq+csSUuw8djJB/7eaQFCH Xclg== X-Gm-Message-State: APjAAAWt1ZRax8eVz8xpm7jbV9lQ3H7KnXrrSuIadVBLh+DWoxzWYJLh A6J3TMc7G/yb16KHxIzLIGhbzQ== X-Google-Smtp-Source: APXvYqy3mTOff/5UucNGniK8fyS/O+Xgm14NgFfPUR1PrG8IBcUY/kuiLl/NHA1b0kfdyxfyfp644Q== X-Received: by 2002:a62:108:: with SMTP id 8mr9220601pfb.53.1572247209947; Mon, 28 Oct 2019 00:20:09 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id 13sm11504703pgq.72.2019.10.28.00.20.06 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 28 Oct 2019 00:20:09 -0700 (PDT) From: Baolin Wang To: sre@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, yuanjiang.yu@unisoc.com, baolin.wang@linaro.org, baolin.wang7@gmail.com, zhang.lyra@gmail.com, orsonzhai@gmail.com Subject: [PATCH 5/5] power: supply: sc27xx: Calibrate the resistance of coulomb counter Date: Mon, 28 Oct 2019 15:19:01 +0800 Message-Id: <9c25e3ab9bdba2914b22cfe7495818740437ef27.1572245011.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org There are some deviations between the real resistance and the ideal resistance of coulomb counter, which will affect the accuracy of the coulomb counter, thus calibrate the real resistance of coulomb counter to improve the accuracy. Signed-off-by: Baolin Wang --- drivers/power/supply/sc27xx_fuel_gauge.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c index 221b6fb..f363fa7 100644 --- a/drivers/power/supply/sc27xx_fuel_gauge.c +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -62,6 +62,8 @@ #define SC27XX_FGU_CUR_BASIC_ADC 8192 #define SC27XX_FGU_SAMPLE_HZ 2 +/* micro Ohms */ +#define SC27XX_FGU_IDEAL_RESISTANCE 20000 /* * struct sc27xx_fgu_data: describe the FGU device @@ -84,6 +86,7 @@ * @resist_table_len: the resistance table length * @cur_1000ma_adc: ADC value corresponding to 1000 mA * @vol_1000mv_adc: ADC value corresponding to 1000 mV + * @calib_resist: the real resistance of coulomb counter chip in mOhm * @cap_table: capacity table with corresponding ocv * @resist_table: resistance percent table with corresponding temperature */ @@ -108,6 +111,7 @@ struct sc27xx_fgu_data { int resist_table_len; int cur_1000ma_adc; int vol_1000mv_adc; + int calib_resist; struct power_supply_battery_ocv_table *cap_table; struct power_supply_resistance_temp_table *resist_table; }; @@ -900,7 +904,9 @@ static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data) */ cal_4200mv = (calib_data & 0x1ff) + 6963 - 4096 - 256; data->vol_1000mv_adc = DIV_ROUND_CLOSEST(cal_4200mv * 10, 42); - data->cur_1000ma_adc = data->vol_1000mv_adc * 4; + data->cur_1000ma_adc = + DIV_ROUND_CLOSEST(data->vol_1000mv_adc * 4 * data->calib_resist, + SC27XX_FGU_IDEAL_RESISTANCE); kfree(buf); return 0; @@ -1079,6 +1085,15 @@ static int sc27xx_fgu_probe(struct platform_device *pdev) return ret; } + ret = device_property_read_u32(&pdev->dev, + "sprd,calib-resistance", + &data->calib_resist); + if (ret) { + dev_err(&pdev->dev, + "failed to get fgu calibration resistance\n"); + return ret; + } + data->channel = devm_iio_channel_get(dev, "bat-temp"); if (IS_ERR(data->channel)) { dev_err(dev, "failed to get IIO channel\n"); -- 1.7.9.5