From patchwork Mon Aug 9 01:15:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Xue X-Patchwork-Id: 12425173 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=-16.8 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=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 4150EC432BE for ; Mon, 9 Aug 2021 01:15:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22204606A5 for ; Mon, 9 Aug 2021 01:15:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231576AbhHIBP7 (ORCPT ); Sun, 8 Aug 2021 21:15:59 -0400 Received: from lucky1.263xmail.com ([211.157.147.131]:40114 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232604AbhHIBP7 (ORCPT ); Sun, 8 Aug 2021 21:15:59 -0400 Received: from localhost (unknown [192.168.167.70]) by lucky1.263xmail.com (Postfix) with ESMTP id C4BAAC27F9; Mon, 9 Aug 2021 09:15:26 +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 P4988T139771212945152S1628471718235274_; Mon, 09 Aug 2021 09:15:21 +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 v3] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe Date: Mon, 9 Aug 2021 09:15:17 +0800 Message-Id: <20210809011517.6374-1-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 Add voltage notifier, no need to query regulator voltage for every saradc read, just get regulator voltage once at probe. Signed-off-by: David Wu Signed-off-by: Simon Xue Reviewed-by: Heiko Stuebner --- drivers/iio/adc/rockchip_saradc.c | 46 ++++++++++++++++++++++++++----- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index f3eb8d2e50dc..33c7dd635eb9 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -49,10 +49,12 @@ 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; const struct iio_chan_spec *last_chan; + struct notifier_block nb; }; static void rockchip_saradc_power_down(struct rockchip_saradc *info) @@ -105,13 +107,7 @@ 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: @@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p) return IRQ_HANDLED; } +static int rockchip_saradc_volt_notify(struct notifier_block *nb, + unsigned long event, + void *data) +{ + struct rockchip_saradc *info = + container_of(nb, struct rockchip_saradc, nb); + + if (event & REGULATOR_EVENT_VOLTAGE_CHANGE) + info->uv_vref = (unsigned long)data; + + return NOTIFY_OK; +} + +static void rockchip_saradc_regulator_action(void *data) +{ + struct rockchip_saradc *info = data; + + regulator_unregister_notifier(info->vref, &info->nb); +} + static int rockchip_saradc_probe(struct platform_device *pdev) { struct rockchip_saradc *info = NULL; @@ -410,6 +426,12 @@ static int rockchip_saradc_probe(struct platform_device *pdev) return ret; } + ret = regulator_get_voltage(info->vref); + if (ret < 0) + return ret; + + info->uv_vref = ret; + ret = clk_prepare_enable(info->pclk); if (ret < 0) { dev_err(&pdev->dev, "failed to enable pclk\n"); @@ -450,6 +472,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev) if (ret) return ret; + info->nb.notifier_call = rockchip_saradc_volt_notify; + ret = regulator_register_notifier(info->vref, &info->nb); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&pdev->dev, + rockchip_saradc_regulator_action, info); + if (ret) + return ret; + return devm_iio_device_register(&pdev->dev, indio_dev); }