From patchwork Mon Aug 2 09:09:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Xue X-Patchwork-Id: 12413619 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 111BAC4320A for ; Mon, 2 Aug 2021 09:10:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCFC161057 for ; Mon, 2 Aug 2021 09:10:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232814AbhHBJKS (ORCPT ); Mon, 2 Aug 2021 05:10:18 -0400 Received: from lucky1.263xmail.com ([211.157.147.133]:39250 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232782AbhHBJKR (ORCPT ); Mon, 2 Aug 2021 05:10:17 -0400 Received: from localhost (unknown [192.168.167.235]) by lucky1.263xmail.com (Postfix) with ESMTP id 3A6E3D5D9C; Mon, 2 Aug 2021 17:10:03 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ADDR-CHECKED4: 1 X-SKE-CHECKED: 1 X-ANTISPAM-LEVEL: 2 Received: from xxm-vm.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P25115T140690434549504S1627895398918754_; Mon, 02 Aug 2021 17:10:02 +0800 (CST) X-IP-DOMAINF: 1 X-UNIQUE-TAG: X-RL-SENDER: xxm@rock-chips.com X-SENDER: xxm@rock-chips.com X-LOGIN-NAME: xxm@rock-chips.com X-FST-TO: jic23@kernel.org X-RCPT-COUNT: 11 X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-System-Flag: 0 From: Simon Xue To: Jonathan Cameron Cc: linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, robh+dt@kernel.org, Johan Jonker , Heiko Stuebner , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org, David Wu , Simon Xue Subject: [PATCH] iio: adc: rockchip_saradc: just get referenced voltage once at probe Date: Mon, 2 Aug 2021 17:09:29 +0800 Message-Id: <20210802090929.37970-1-xxm@rock-chips.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: David Wu The referenced voltage is not changed after initiation, so just only get referenced voltage once. Signed-off-by: Simon Xue Signed-off-by: David Wu --- drivers/iio/adc/rockchip_saradc.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index f3eb8d2e50dc..cd33c0b9d3eb 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -49,6 +49,7 @@ struct rockchip_saradc { struct clk *clk; struct completion completion; struct regulator *vref; + int uv_vref; struct reset_control *reset; const struct rockchip_saradc_data *data; u16 last_val; @@ -105,13 +106,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev, mutex_unlock(&indio_dev->mlock); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: - ret = regulator_get_voltage(info->vref); - if (ret < 0) { - dev_err(&indio_dev->dev, "failed to get voltage\n"); - return ret; - } - - *val = ret / 1000; + *val = info->uv_vref / 1000; *val2 = chan->scan_type.realbits; return IIO_VAL_FRACTIONAL_LOG2; default: @@ -410,6 +405,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev) return ret; } + info->uv_vref = regulator_get_voltage(info->vref); + if (info->uv_vref < 0) { + dev_err(&pdev->dev, "failed to get voltage\n"); + ret = info->uv_vref; + return ret; + } + ret = clk_prepare_enable(info->pclk); if (ret < 0) { dev_err(&pdev->dev, "failed to enable pclk\n");