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=unavailable 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 52BCDCA9EC3 for ; Thu, 31 Oct 2019 12:24:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 27CDB208E3 for ; Thu, 31 Oct 2019 12:24:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="a0/sfJRT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727440AbfJaMX6 (ORCPT ); Thu, 31 Oct 2019 08:23:58 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:39258 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727438AbfJaMX5 (ORCPT ); Thu, 31 Oct 2019 08:23:57 -0400 Received: by mail-pg1-f196.google.com with SMTP id p12so3957915pgn.6 for ; Thu, 31 Oct 2019 05:23:57 -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=3oVOdq8I07h/GCMR1jINzKAZkqhi2YtbfA6UhRaG+n8=; b=a0/sfJRTsmfaNdczbP/UocpLZeZWofQtNcy/OCkKLyPFEzM62I2i+2UIUeRohI2Pzh dJuAqpawZBwB5gf8KbLZvqBtZ66tXwq2oxP+j3mLWZj9WIvAfeeHLVRlv5iZRzYdIGY/ +BJkEgbFY56XdIUiDecypECQx/gY0Cw/rRF3Zk1aB6ci+f3XVrTAqSJbI/9gvnmt/0TW Y9N42pwj+OY+n4tYx/ZGe85ChkV3wNss7JpiczK4K3v54hwlYdHYduIzEo/qO/rURc8w tj1UPWzFILDZuc0MMFy/cm6aLQw95ceusZWQGBscvGtkPJgt+FVEIxblgYJ12ZkCJfQP vwtQ== 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=3oVOdq8I07h/GCMR1jINzKAZkqhi2YtbfA6UhRaG+n8=; b=UaF1VLtfITtVhdhjiMv/nKP1D0wt4SGVCVZDIk0veAI1VIbyFr28CnyBmpCxFxIF6o WFATbqRxKYWRlT2v8qLAEDdbpqtdfHY7lhaMqOG/2/sUlIU1FvuDqEYYEZS/gegC0XBu I6UTdIszRto0FkdTE4NdiUMRzz3IcoIrrCi0AoFoq3NliWg0YDK8DTt7hweiTBzk+e/W HbMQErv84PJ5TqKtmWRXaLZOjOks9+11Qz47/m2Jb1Gj4b3wb2KWRfZHI7T+YCXo+Y4p fUybD+KAc5cf7Jh7RQINwNJbJXt4GftJ8WxYRoe4yJvmaWMcGqjPbnBX3jTOxhobqi63 IlNg== X-Gm-Message-State: APjAAAX+tH678IVHXYG+T+JMp9DCt7IY+DJwW8YkagMbpz2ctlwxa+0B FZavoGbTyN8beUNzIQvMBVK5ng== X-Google-Smtp-Source: APXvYqwRsBatPyRPC6H5u3bNXQ3d9fpGbW7bwKpnEtOkZpwtidHIsC1wSk8dAdf1LqVvm7kugUi34w== X-Received: by 2002:a63:6d8b:: with SMTP id i133mr6165132pgc.241.1572524636826; Thu, 31 Oct 2019 05:23:56 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id j25sm2983077pfi.113.2019.10.31.05.23.52 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 31 Oct 2019 05:23:55 -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 v2 5/5] power: supply: sc27xx: Calibrate the resistance of coulomb counter Date: Thu, 31 Oct 2019 20:22:44 +0800 Message-Id: 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..951d5d1 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-micro-ohms", + &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