From patchwork Mon Aug 30 17:21:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Cai,Huoqing" X-Patchwork-Id: 12465587 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 59640C43214 for ; Mon, 30 Aug 2021 17:22:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4693D60F42 for ; Mon, 30 Aug 2021 17:22:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238095AbhH3RW4 (ORCPT ); Mon, 30 Aug 2021 13:22:56 -0400 Received: from mx21.baidu.com ([220.181.3.85]:33714 "EHLO baidu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S238071AbhH3RWu (ORCPT ); Mon, 30 Aug 2021 13:22:50 -0400 Received: from BC-Mail-Ex31.internal.baidu.com (unknown [172.31.51.25]) by Forcepoint Email with ESMTPS id AA1C1A032A40A88CC603; Tue, 31 Aug 2021 01:21:53 +0800 (CST) Received: from BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) by BC-Mail-Ex31.internal.baidu.com (172.31.51.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2242.12; Tue, 31 Aug 2021 01:21:53 +0800 Received: from LAPTOP-UKSR4ENP.internal.baidu.com (172.31.63.8) by BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Tue, 31 Aug 2021 01:21:52 +0800 From: Cai Huoqing To: , , , , , , , , CC: , , , , "Cai Huoqing" Subject: [PATCH 3/6] iio: imx8qxp-adc: Add the detail for NXP i.MX8QuadXPlus ADC driver Date: Tue, 31 Aug 2021 01:21:37 +0800 Message-ID: <20210830172140.414-4-caihuoqing@baidu.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210830172140.414-1-caihuoqing@baidu.com> References: <20210830172140.414-1-caihuoqing@baidu.com> MIME-Version: 1.0 X-Originating-IP: [172.31.63.8] X-ClientProxiedBy: BC-Mail-Ex15.internal.baidu.com (172.31.51.55) To BJHW-MAIL-EX27.internal.baidu.com (10.127.64.42) Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The NXP i.MX 8QuadXPlus SOC has a new ADC IP, so add the detail for NXP i.MX8QuadXPlus ADC driver which includes: probe/remove/pm_ops/iio_dev. Signed-off-by: Cai Huoqing --- drivers/iio/adc/imx8qxp-adc.c | 513 ++++++++++++++++++++++++++++++++++ 1 file changed, 513 insertions(+) diff --git a/drivers/iio/adc/imx8qxp-adc.c b/drivers/iio/adc/imx8qxp-adc.c index aec1b45c8fb9..d39bf382c582 100644 --- a/drivers/iio/adc/imx8qxp-adc.c +++ b/drivers/iio/adc/imx8qxp-adc.c @@ -20,23 +20,536 @@ #define ADC_DRIVER_NAME "imx8qxp-adc" +/* Register map definition */ +#define ADC_CTRL 0x10 +#define ADC_STAT 0x14 +#define ADC_IE 0x18 +#define ADC_DE 0x1c +#define ADC_CFG 0x20 +#define ADC_FCTRL 0x30 +#define ADC_SWTRIG 0x34 +#define ADC_TCTRL(tid) (0xc0 + tid * 4) +#define ADC_CMDH(cid) (0x100 + cid * 8) +#define ADC_CMDL(cid) (0x104 + cid * 8) +#define ADC_RESFIFO 0x300 +#define ADC_TST 0xffc + +/* ADC bit shift */ +#define ADC_IE_FWMIE_SHIFT (0) +#define ADC_CTRL_FIFO_RESET_SHIFT (8) +#define ADC_CTRL_SOFTWARE_RESET_SHIFT (1) +#define ADC_CTRL_ADC_ENABLE (0) +#define ADC_TCTRL_TCMD_SHIFT (24) +#define ADC_TCTRL_TDLY_SHIFT (16) +#define ADC_TCTRL_TPRI_SHIFT (8) +#define ADC_TCTRL_HTEN_SHIFT (0) +#define ADC_CMDL_CSCALE_SHIFT (8) +#define ADC_CMDL_MODE_SHIFT (7) +#define ADC_CMDL_DIFF_SHIFT (6) +#define ADC_CMDL_ABSEL_SHIFT (5) +#define ADC_CMDL_ADCH_SHIFT (0) +#define ADC_CMDH_NEXT_SHIFT (24) +#define ADC_CMDH_LOOP_SHIFT (16) +#define ADC_CMDH_AVGS_SHIFT (12) +#define ADC_CMDH_STS_SHIFT (8) +#define ADC_CMDH_LWI_SHIFT (7) +#define ADC_CMDH_CMPEN_SHIFT (0) +#define ADC_CFG_PWREN_SHIFT (28) +#define ADC_CFG_PUDLY_SHIFT (16) +#define ADC_CFG_REFSEL_SHIFT (6) +#define ADC_CFG_PWRSEL_SHIFT (4) +#define ADC_CFG_TPRICTRL_SHIFT (0) +#define ADC_FCTRL_FWMARK_SHIFT (16) +#define ADC_FCTRL_FWMARK_MASK (0x1f << 16) +#define ADC_FCTRL_FCOUNT_MASK (0x1f) + +/* ADC PARAMETER*/ +#define ADC_CMDL_CHANNEL_SCALE_FULL (0x3f) +#define ADC_CMDL_SEL_A_A_B_CHANNEL (0) +#define ADC_CMDL_STANDARD_RESOLUTION (0) +#define ADC_CMDL_MODE_SINGLE (0) +#define ADC_CMDH_LWI_INCREMENT_DISABLE (0) +#define ADC_CMDH_CMPEN_DISABLE (0) +#define ADC_PAUSE_ENABLE (0x80000000) +#define ADC_TCTRL_TPRI_PRIORITY_HIGH (0) + +#define ADC_TCTRL_HTEN_HARDWARE_TIRGGER_DISABLE (0) + +#define MAX_CMD (8) +#define MAX_TRIG (8) + +#define ADC_TIMEOUT msecs_to_jiffies(100) + +struct imx8qxp_adc_trigger_ctrl { + u32 tcmd; + u32 tdly; + u32 tpri; + u32 hten; +}; + +struct imx8qxp_adc_cmd_l { + u32 scale; + u32 mode; + u32 diff; + u32 absel; + u32 adch; +}; + +struct imx8qxp_adc_cmd_h { + u32 next; + u32 loop; + u32 avgs; + u32 sts; + u32 lwi; + u32 cmpen; +}; + +struct imx8qxp_adc_cfg { + u32 pwren; + u32 pudly; + u32 refsel; + u32 pwrsel; + u32 tprictrl; +}; + +struct imx8qxp_adc { + struct device *dev; + void __iomem *regs; + struct clk *clk; + struct clk *ipg_clk; + + u32 vref_uv; + u32 value; + u32 channel_id; + u32 trigger_id; + u32 cmd_id; + + struct regulator *vref; + struct imx8qxp_adc_cmd_l adc_cmd_l[MAX_CMD + 1]; + struct imx8qxp_adc_cmd_h adc_cmd_h[MAX_CMD + 1]; + struct imx8qxp_adc_trigger_ctrl adc_trigger_ctrl[MAX_TRIG + 1]; + struct imx8qxp_adc_cfg adc_cfg; + struct completion completion; +}; + +#define IMX8QXP_ADC_CHAN(_idx) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (_idx), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ +} + +static const struct iio_chan_spec imx8qxp_adc_iio_channels[] = { + IMX8QXP_ADC_CHAN(0), + IMX8QXP_ADC_CHAN(1), + IMX8QXP_ADC_CHAN(2), + IMX8QXP_ADC_CHAN(3), + IMX8QXP_ADC_CHAN(4), + IMX8QXP_ADC_CHAN(5), + IMX8QXP_ADC_CHAN(6), + IMX8QXP_ADC_CHAN(7), +}; + +static void imx8qxp_adc_feature_prepare(struct imx8qxp_adc *adc) +{ + u32 i; + + adc->trigger_id = 0; + adc->cmd_id = 0; + adc->channel_id = 0; + + for (i = 0; i < MAX_CMD + 1; i++) { + adc->adc_cmd_l[i].scale = 1; + adc->adc_cmd_l[i].mode = 0; + adc->adc_cmd_l[i].diff = 0; + adc->adc_cmd_l[i].absel = 0; + adc->adc_cmd_l[i].adch = 0; + adc->adc_cmd_h[i].next = 0; + adc->adc_cmd_h[i].loop = 0; + adc->adc_cmd_h[i].avgs = 0; + adc->adc_cmd_h[i].sts = 0; + adc->adc_cmd_h[i].lwi = 0; + adc->adc_cmd_h[i].cmpen = 0; + } + + for (i = 0; i < MAX_TRIG; i++) { + adc->adc_trigger_ctrl[i].tcmd = 0; + adc->adc_trigger_ctrl[i].tdly = 0; + adc->adc_trigger_ctrl[i].tpri = 0; + adc->adc_trigger_ctrl[i].hten = 0; + } + + adc->adc_cfg.pwren = 0; + adc->adc_cfg.pudly = 0; + adc->adc_cfg.refsel = 0; + adc->adc_cfg.pwrsel = 0; + adc->adc_cfg.tprictrl = 0; +} + +static void imx8qxp_adc_reset(struct imx8qxp_adc *adc) +{ + u32 ctrl; + + /*software reset, need to clear the set bit*/ + ctrl = readl(adc->regs + ADC_CTRL); + ctrl |= 1 << ADC_CTRL_SOFTWARE_RESET_SHIFT; + writel(ctrl, adc->regs + ADC_CTRL); + udelay(10); + ctrl &= ~(1 << ADC_CTRL_SOFTWARE_RESET_SHIFT); + writel(ctrl, adc->regs + ADC_CTRL); + + /* reset the fifo */ + ctrl |= 1 << ADC_CTRL_FIFO_RESET_SHIFT; + writel(ctrl, adc->regs + ADC_CTRL); +} + +static void imx8qxp_adc_reg_config(struct imx8qxp_adc *adc) +{ + u32 adc_cfg, adc_tctrl, adc_cmdl, adc_cmdh; + u32 t_id, c_id; + + adc_cfg = adc->adc_cfg.pwren << ADC_CFG_PWREN_SHIFT | + adc->adc_cfg.pudly << ADC_CFG_PUDLY_SHIFT | + adc->adc_cfg.refsel << ADC_CFG_REFSEL_SHIFT | + adc->adc_cfg.pwrsel << ADC_CFG_PWRSEL_SHIFT | + adc->adc_cfg.tprictrl << ADC_CFG_TPRICTRL_SHIFT; + writel(adc_cfg, adc->regs + ADC_CFG); + + t_id = adc->trigger_id; + adc_tctrl = adc->adc_trigger_ctrl[t_id].tcmd << ADC_TCTRL_TCMD_SHIFT | + adc->adc_trigger_ctrl[t_id].tdly << ADC_TCTRL_TDLY_SHIFT | + adc->adc_trigger_ctrl[t_id].tpri << ADC_TCTRL_TPRI_SHIFT | + adc->adc_trigger_ctrl[t_id].hten << ADC_TCTRL_HTEN_SHIFT; + writel(adc_tctrl, adc->regs + ADC_TCTRL(t_id)); + + c_id = adc->cmd_id - 1; + adc_cmdl = adc->adc_cmd_l[c_id].scale << ADC_CMDL_CSCALE_SHIFT | + adc->adc_cmd_l[c_id].mode << ADC_CMDL_MODE_SHIFT | + adc->adc_cmd_l[c_id].diff << ADC_CMDL_DIFF_SHIFT | + adc->adc_cmd_l[c_id].absel << ADC_CMDL_ABSEL_SHIFT | + adc->adc_cmd_l[c_id].adch << ADC_CMDL_ADCH_SHIFT; + writel(adc_cmdl, adc->regs + ADC_CMDL(c_id)); + + adc_cmdh = adc->adc_cmd_h[c_id].next << ADC_CMDH_NEXT_SHIFT | + adc->adc_cmd_h[c_id].loop << ADC_CMDH_LOOP_SHIFT | + adc->adc_cmd_h[c_id].avgs << ADC_CMDH_AVGS_SHIFT | + adc->adc_cmd_h[c_id].sts << ADC_CMDH_STS_SHIFT | + adc->adc_cmd_h[c_id].lwi << ADC_CMDH_LWI_SHIFT | + adc->adc_cmd_h[c_id].cmpen << ADC_CMDH_CMPEN_SHIFT; + writel(adc_cmdh, adc->regs + ADC_CMDH(c_id)); +} + +static void imx8qxp_adc_mode_config(struct imx8qxp_adc *adc) +{ + u32 cmd_id, trigger_id, channel_id; + + channel_id = adc->channel_id; + cmd_id = adc->cmd_id - 1; + trigger_id = adc->trigger_id; + + /* config the cmd */ + adc->adc_cmd_l[cmd_id].scale = ADC_CMDL_CHANNEL_SCALE_FULL; + adc->adc_cmd_l[cmd_id].mode = ADC_CMDL_STANDARD_RESOLUTION; + adc->adc_cmd_l[cmd_id].diff = ADC_CMDL_MODE_SINGLE; + adc->adc_cmd_l[cmd_id].absel = ADC_CMDL_SEL_A_A_B_CHANNEL; + adc->adc_cmd_l[cmd_id].adch = channel_id; + + adc->adc_cmd_h[cmd_id].next = 0; + adc->adc_cmd_h[cmd_id].loop = 0; + adc->adc_cmd_h[cmd_id].avgs = 7; + adc->adc_cmd_h[cmd_id].sts = 0; + adc->adc_cmd_h[cmd_id].lwi = ADC_CMDH_LWI_INCREMENT_DISABLE; + adc->adc_cmd_h[cmd_id].cmpen = ADC_CMDH_CMPEN_DISABLE; + + /* config the trigger control */ + adc->adc_trigger_ctrl[trigger_id].tcmd = adc->cmd_id; + adc->adc_trigger_ctrl[trigger_id].tdly = 0; + adc->adc_trigger_ctrl[trigger_id].tpri = ADC_TCTRL_TPRI_PRIORITY_HIGH; + adc->adc_trigger_ctrl[trigger_id].hten = ADC_TCTRL_HTEN_HARDWARE_TIRGGER_DISABLE; + + /* ADC configuration */ + adc->adc_cfg.pwren = 1; + adc->adc_cfg.pudly = 0x80; + adc->adc_cfg.refsel = 0; + adc->adc_cfg.pwrsel = 3; + adc->adc_cfg.tprictrl = 0; + + imx8qxp_adc_reg_config(adc); +} + +static void imx8qxp_adc_fifo_config(struct imx8qxp_adc *adc) +{ + u32 fifo_ctrl, interrupt_en; + + fifo_ctrl = readl(adc->regs + ADC_FCTRL); + fifo_ctrl &= ~ADC_FCTRL_FWMARK_MASK; + /* set the watermark level to 1 */ + fifo_ctrl |= 0 << ADC_FCTRL_FWMARK_SHIFT; + writel(fifo_ctrl, adc->regs + ADC_FCTRL); + + /* FIFO Watermark Interrupt Enable */ + interrupt_en = readl(adc->regs + ADC_IE); + interrupt_en |= 1 << ADC_IE_FWMIE_SHIFT; + writel(interrupt_en, adc->regs + ADC_IE); +} + +static void imx8qxp_adc_disable(struct imx8qxp_adc *adc) +{ + u32 ctrl; + + ctrl = readl(adc->regs + ADC_CTRL) & ~(1 << ADC_CTRL_ADC_ENABLE); + writel(ctrl, adc->regs + ADC_CTRL); +} + +static int imx8qxp_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct imx8qxp_adc *adc = iio_priv(indio_dev); + struct device *dev = adc->dev; + + u32 channel; + u32 ctrl; + long ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + pm_runtime_get_sync(dev); + + mutex_lock(&indio_dev->mlock); + reinit_completion(&adc->completion); + + channel = chan->channel & 0x07; + adc->channel_id = channel; + adc->cmd_id = 1; + adc->trigger_id = 0; + imx8qxp_adc_mode_config(adc); + + imx8qxp_adc_fifo_config(adc); + + /* adc enable */ + ctrl = readl(adc->regs + ADC_CTRL) | (1 << ADC_CTRL_ADC_ENABLE); + writel(ctrl, adc->regs + ADC_CTRL); + /* adc start */ + writel(1 << adc->trigger_id, adc->regs + ADC_SWTRIG); + + ret = wait_for_completion_interruptible_timeout + (&adc->completion, ADC_TIMEOUT); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_sync_autosuspend(dev); + + if (ret == 0) { + mutex_unlock(&indio_dev->mlock); + return -ETIMEDOUT; + } + if (ret < 0) { + mutex_unlock(&indio_dev->mlock); + return ret; + } + + *val = adc->value; + mutex_unlock(&indio_dev->mlock); + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + adc->vref_uv = regulator_get_voltage(adc->vref); + *val = adc->vref_uv / 1000; + *val2 = 12; + return IIO_VAL_FRACTIONAL_LOG2; + + case IIO_CHAN_INFO_SAMP_FREQ: + *val = clk_get_rate(adc->clk) / 3; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static irqreturn_t imx8qxp_adc_isr(int irq, void *dev_id) +{ + struct imx8qxp_adc *adc = (struct imx8qxp_adc *)dev_id; + + u32 fifo_count; + + fifo_count = readl(adc->regs + ADC_FCTRL) + & ADC_FCTRL_FCOUNT_MASK; + + if (fifo_count) { + adc->value = (readl(adc->regs + ADC_RESFIFO) & 0xffff) >> 3; + complete(&adc->completion); + } + + return IRQ_HANDLED; +} + +static int imx8qxp_adc_reg_access(struct iio_dev *indio_dev, unsigned int reg, + unsigned int writeval, unsigned int *readval) +{ + struct imx8qxp_adc *adc = iio_priv(indio_dev); + struct device *dev = adc->dev; + + if (!readval || reg % 4 || reg > ADC_TST) + return -EINVAL; + + pm_runtime_get_sync(dev); + + *readval = readl(adc->regs + reg); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_sync_autosuspend(dev); + + return 0; +} + +static const struct iio_info imx8qxp_adc_iio_info = { + .read_raw = &imx8qxp_adc_read_raw, + .debugfs_reg_access = &imx8qxp_adc_reg_access, +}; + static int imx8qxp_adc_probe(struct platform_device *pdev) { + struct imx8qxp_adc *adc; + struct iio_dev *indio_dev; + struct device *dev = &pdev->dev; + int irq; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*adc)); + if (!indio_dev) { + dev_err(dev, "Failed allocating iio device\n"); + return -ENOMEM; + } + + adc = iio_priv(indio_dev); + adc->dev = dev; + + adc->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(adc->regs)) + return PTR_ERR(adc->regs); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + adc->clk = devm_clk_get(dev, "per"); + if (IS_ERR(adc->clk)) { + ret = PTR_ERR(adc->clk); + dev_err(dev, "Failed getting clock, err = %d\n", ret); + return ret; + } + + adc->ipg_clk = devm_clk_get(dev, "ipg"); + if (IS_ERR(adc->ipg_clk)) { + ret = PTR_ERR(adc->ipg_clk); + dev_err(dev, "Failed getting clock, err = %d\n", ret); + return ret; + } + + adc->vref = devm_regulator_get(dev, "vref"); + if (IS_ERR(adc->vref)) { + ret = PTR_ERR(adc->vref); + dev_err(dev, + "Failed getting reference voltage, err = %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, indio_dev); + + init_completion(&adc->completion); + + indio_dev->name = dev_name(dev); + indio_dev->info = &imx8qxp_adc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = imx8qxp_adc_iio_channels; + indio_dev->num_channels = ARRAY_SIZE(imx8qxp_adc_iio_channels); + + ret = devm_request_irq(dev, irq, imx8qxp_adc_isr, 0, dev_name(dev), adc); + if (ret < 0) { + dev_err(dev, "Failed requesting irq, irq = %d\n", irq); + return ret; + } + + imx8qxp_adc_feature_prepare(adc); + imx8qxp_adc_reset(adc); + + ret = iio_device_register(indio_dev); + if (ret) { + imx8qxp_adc_disable(adc); + dev_err(dev, "Couldn't register the device.\n"); + return ret; + } + + pm_runtime_set_active(dev); + pm_runtime_set_autosuspend_delay(dev, 50); + pm_runtime_use_autosuspend(dev); + pm_runtime_enable(dev); + return 0; } static int imx8qxp_adc_remove(struct platform_device *pdev) { + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct imx8qxp_adc *adc = iio_priv(indio_dev); + struct device *dev = adc->dev; + + pm_runtime_get_sync(dev); + + iio_device_unregister(indio_dev); + + imx8qxp_adc_disable(adc); + + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); + return 0; } static int imx8qxp_adc_runtime_suspend(struct device *dev) { + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct imx8qxp_adc *adc = iio_priv(indio_dev); + + imx8qxp_adc_disable(adc); + + clk_disable_unprepare(adc->clk); + clk_disable_unprepare(adc->ipg_clk); + regulator_disable(adc->vref); + return 0; } static int imx8qxp_adc_runtime_resume(struct device *dev) { + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct imx8qxp_adc *adc = iio_priv(indio_dev); + int ret; + + ret = regulator_enable(adc->vref); + if (ret) { + dev_err(dev, "Can't enable adc reference top voltage, err = %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(adc->clk); + if (ret) { + dev_err(dev, "Could not prepare or enable clock.\n"); + regulator_disable(adc->vref); + return ret; + } + + ret = clk_prepare_enable(adc->ipg_clk); + if (ret) { + dev_err(dev, "Could not prepare or enable clock.\n"); + clk_disable_unprepare(adc->clk); + regulator_disable(adc->vref); + return ret; + } + imx8qxp_adc_reset(adc); + return 0; }