From patchwork Sun May 17 19:48:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artur Rojek X-Patchwork-Id: 11554359 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9770460D for ; Sun, 17 May 2020 19:49:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89B73207D3 for ; Sun, 17 May 2020 19:49:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726557AbgEQTtb (ORCPT ); Sun, 17 May 2020 15:49:31 -0400 Received: from relay8-d.mail.gandi.net ([217.70.183.201]:38733 "EHLO relay8-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726269AbgEQTta (ORCPT ); Sun, 17 May 2020 15:49:30 -0400 X-Originating-IP: 195.189.32.242 Received: from pc.localdomain (unknown [195.189.32.242]) (Authenticated sender: contact@artur-rojek.eu) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 1DD951BF208; Sun, 17 May 2020 19:49:25 +0000 (UTC) From: Artur Rojek To: Dmitry Torokhov , Rob Herring , Mark Rutland , Jonathan Cameron , Paul Cercueil , Andy Shevchenko Cc: Heiko Stuebner , Ezequiel Garcia , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Artur Rojek Subject: [PATCH v7 2/7] IIO: Ingenic JZ47xx: Error check clk_enable calls. Date: Sun, 17 May 2020 21:48:59 +0200 Message-Id: <20200517194904.34758-2-contact@artur-rojek.eu> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200517194904.34758-1-contact@artur-rojek.eu> References: <20200517194904.34758-1-contact@artur-rojek.eu> MIME-Version: 1.0 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Introduce error checks for the clk_enable calls used in this driver. As part of the changes, move clk_enable/clk_disable calls out of ingenic_adc_set_config and into respective logic of its callers. Signed-off-by: Artur Rojek Tested-by: Paul Cercueil --- Changes: v6: new patch v7: no change drivers/iio/adc/ingenic-adc.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c index 39c0a609fc94..6c3bbba7c44b 100644 --- a/drivers/iio/adc/ingenic-adc.c +++ b/drivers/iio/adc/ingenic-adc.c @@ -73,7 +73,6 @@ static void ingenic_adc_set_config(struct ingenic_adc *adc, { uint32_t cfg; - clk_enable(adc->clk); mutex_lock(&adc->lock); cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask; @@ -81,7 +80,6 @@ static void ingenic_adc_set_config(struct ingenic_adc *adc, writel(cfg, adc->base + JZ_ADC_REG_CFG); mutex_unlock(&adc->lock); - clk_disable(adc->clk); } static void ingenic_adc_enable(struct ingenic_adc *adc, @@ -124,6 +122,8 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev, long m) { struct ingenic_adc *adc = iio_priv(iio_dev); + struct device *dev = iio_dev->dev.parent; + int ret; switch (m) { case IIO_CHAN_INFO_SCALE: @@ -131,6 +131,14 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev, case INGENIC_ADC_BATTERY: if (!adc->soc_data->battery_vref_mode) return -EINVAL; + + ret = clk_enable(adc->clk); + if (ret) { + dev_err(dev, "Failed to enable clock: %d\n", + ret); + return ret; + } + if (val > JZ_ADC_BATTERY_LOW_VREF) { ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_BAT_MD, @@ -142,6 +150,9 @@ static int ingenic_adc_write_raw(struct iio_dev *iio_dev, JZ_ADC_REG_CFG_BAT_MD); adc->low_vref_mode = true; } + + clk_disable(adc->clk); + return 0; default: return -EINVAL; @@ -317,6 +328,13 @@ static int ingenic_adc_read_chan_info_raw(struct ingenic_adc *adc, int *val) { int bit, ret, engine = (chan->channel == INGENIC_ADC_BATTERY); + struct device *dev = iio_priv_to_dev(adc)->dev.parent; + + ret = clk_enable(adc->clk); + if (ret) { + dev_err(dev, "Failed to enable clock: %d\n", ret); + return ret; + } /* We cannot sample AUX/AUX2 in parallel. */ mutex_lock(&adc->aux_lock); @@ -325,7 +343,6 @@ static int ingenic_adc_read_chan_info_raw(struct ingenic_adc *adc, ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_AUX_MD, bit); } - clk_enable(adc->clk); ret = ingenic_adc_capture(adc, engine); if (ret) goto out;