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[23.128.96.18]) by mx.google.com with ESMTP id i12si4079817ejo.471.2020.05.31.07.49.31; Sun, 31 May 2020 07:49:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728134AbgEaOpl (ORCPT + 99 others); Sun, 31 May 2020 10:45:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725889AbgEaOpl (ORCPT ); Sun, 31 May 2020 10:45:41 -0400 X-Greylist: delayed 14447 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sun, 31 May 2020 07:45:40 PDT Received: from saturn.retrosnub.co.uk (saturn.retrosnub.co.uk [IPv6:2a00:1098:86::1:1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4173C061A0E; Sun, 31 May 2020 07:45:40 -0700 (PDT) Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) by saturn.retrosnub.co.uk (Postfix; Retrosnub mail submission) with ESMTPSA id A14449E7476; Sun, 31 May 2020 15:45:38 +0100 (BST) Date: Sun, 31 May 2020 15:45:35 +0100 From: Jonathan Cameron To: Alexandru Ardelean Cc: , , , , , Subject: Re: [PATCH v2] iio: stm32-dfsdm-adc: remove usage of iio_priv_to_dev() helper Message-ID: <20200531154535.4e7490e0@archlinux> In-Reply-To: <20200525082648.39656-1-alexandru.ardelean@analog.com> References: <20200522130804.631508-1-alexandru.ardelean@analog.com> <20200525082648.39656-1-alexandru.ardelean@analog.com> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 25 May 2020 11:26:48 +0300 Alexandru Ardelean wrote: > We may want to get rid of the iio_priv_to_dev() helper. The reason is that > we will hide some of the members of the iio_dev structure (to prevent > drivers from accessing them directly), and that will also mean hiding the > implementation of the iio_priv_to_dev() helper inside the IIO core. > > Hiding the implementation of iio_priv_to_dev() implies that some fast-paths > may not be fast anymore, so a general idea is to try to get rid of the > iio_priv_to_dev() altogether. > The iio_priv() helper won't be affected by the rework, as the iio_dev > struct will keep a reference to the private information. > > For this driver, not using iio_priv_to_dev(), means reworking some paths to > pass the iio device and using iio_priv() to access the private information. > > Signed-off-by: Alexandru Ardelean Looks great. Will let it sit a little longer on list for others to review though. Thanks, Jonathan > --- > > Changelog v1 -> v2: > * changed some paths to pass a reference to ref to iio device and access > private state-struct via iio_priv() > > drivers/iio/adc/stm32-dfsdm-adc.c | 65 ++++++++++++++++--------------- > 1 file changed, 33 insertions(+), 32 deletions(-) > > diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c > index 76a60d93fe23..03dfc0b6ba98 100644 > --- a/drivers/iio/adc/stm32-dfsdm-adc.c > +++ b/drivers/iio/adc/stm32-dfsdm-adc.c > @@ -330,9 +330,9 @@ static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev, > return 0; > } > > -static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc) > +static int stm32_dfsdm_start_channel(struct iio_dev *indio_dev) > { > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > const struct iio_chan_spec *chan; > unsigned int bit; > @@ -350,9 +350,9 @@ static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc) > return 0; > } > > -static void stm32_dfsdm_stop_channel(struct stm32_dfsdm_adc *adc) > +static void stm32_dfsdm_stop_channel(struct iio_dev *indio_dev) > { > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > const struct iio_chan_spec *chan; > unsigned int bit; > @@ -418,11 +418,11 @@ static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm, > DFSDM_CR1_DFEN_MASK, DFSDM_CR1_DFEN(0)); > } > > -static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc, > +static int stm32_dfsdm_filter_set_trig(struct iio_dev *indio_dev, > unsigned int fl_id, > struct iio_trigger *trig) > { > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > u32 jextsel = 0, jexten = STM32_DFSDM_JEXTEN_DISABLED; > int ret; > @@ -447,11 +447,11 @@ static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc, > return 0; > } > > -static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc, > +static int stm32_dfsdm_channels_configure(struct iio_dev *indio_dev, > unsigned int fl_id, > struct iio_trigger *trig) > { > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id]; > struct stm32_dfsdm_filter_osr *flo = &fl->flo[0]; > @@ -491,11 +491,11 @@ static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc, > return 0; > } > > -static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc, > +static int stm32_dfsdm_filter_configure(struct iio_dev *indio_dev, > unsigned int fl_id, > struct iio_trigger *trig) > { > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id]; > struct stm32_dfsdm_filter_osr *flo = &fl->flo[fl->fast]; > @@ -521,7 +521,7 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc, > if (ret) > return ret; > > - ret = stm32_dfsdm_filter_set_trig(adc, fl_id, trig); > + ret = stm32_dfsdm_filter_set_trig(indio_dev, fl_id, trig); > if (ret) > return ret; > > @@ -729,21 +729,22 @@ static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev, > return len; > } > > -static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc, > +static int stm32_dfsdm_start_conv(struct iio_dev *indio_dev, > struct iio_trigger *trig) > { > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > int ret; > > - ret = stm32_dfsdm_channels_configure(adc, adc->fl_id, trig); > + ret = stm32_dfsdm_channels_configure(indio_dev, adc->fl_id, trig); > if (ret < 0) > return ret; > > - ret = stm32_dfsdm_start_channel(adc); > + ret = stm32_dfsdm_start_channel(indio_dev); > if (ret < 0) > return ret; > > - ret = stm32_dfsdm_filter_configure(adc, adc->fl_id, trig); > + ret = stm32_dfsdm_filter_configure(indio_dev, adc->fl_id, trig); > if (ret < 0) > goto stop_channels; > > @@ -757,13 +758,14 @@ static int stm32_dfsdm_start_conv(struct stm32_dfsdm_adc *adc, > regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id), > DFSDM_CR1_CFG_MASK, 0); > stop_channels: > - stm32_dfsdm_stop_channel(adc); > + stm32_dfsdm_stop_channel(indio_dev); > > return ret; > } > > -static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc) > +static void stm32_dfsdm_stop_conv(struct iio_dev *indio_dev) > { > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > > stm32_dfsdm_stop_filter(adc->dfsdm, adc->fl_id); > @@ -771,7 +773,7 @@ static void stm32_dfsdm_stop_conv(struct stm32_dfsdm_adc *adc) > regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id), > DFSDM_CR1_CFG_MASK, 0); > > - stm32_dfsdm_stop_channel(adc); > + stm32_dfsdm_stop_channel(indio_dev); > } > > static int stm32_dfsdm_set_watermark(struct iio_dev *indio_dev, > @@ -1017,7 +1019,7 @@ static int __stm32_dfsdm_postenable(struct iio_dev *indio_dev) > goto stop_dfsdm; > } > > - ret = stm32_dfsdm_start_conv(adc, indio_dev->trig); > + ret = stm32_dfsdm_start_conv(indio_dev, indio_dev->trig); > if (ret) { > dev_err(&indio_dev->dev, "Can't start conversion\n"); > goto err_stop_dma; > @@ -1063,7 +1065,7 @@ static void __stm32_dfsdm_predisable(struct iio_dev *indio_dev) > { > struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > > - stm32_dfsdm_stop_conv(adc); > + stm32_dfsdm_stop_conv(indio_dev); > > stm32_dfsdm_adc_dma_stop(indio_dev); > > @@ -1159,7 +1161,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev, > > adc->nconv = 1; > adc->smask = BIT(chan->scan_index); > - ret = stm32_dfsdm_start_conv(adc, NULL); > + ret = stm32_dfsdm_start_conv(indio_dev, NULL); > if (ret < 0) { > regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id), > DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0)); > @@ -1180,7 +1182,7 @@ static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev, > else > ret = IIO_VAL_INT; > > - stm32_dfsdm_stop_conv(adc); > + stm32_dfsdm_stop_conv(indio_dev); > > stm32_dfsdm_process_data(adc, res); > > @@ -1313,8 +1315,8 @@ static const struct iio_info stm32_dfsdm_info_adc = { > > static irqreturn_t stm32_dfsdm_irq(int irq, void *arg) > { > - struct stm32_dfsdm_adc *adc = arg; > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct iio_dev *indio_dev = arg; > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > struct regmap *regmap = adc->dfsdm->regmap; > unsigned int status, int_en; > > @@ -1574,7 +1576,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) > iio->dev.of_node = np; > iio->modes = INDIO_DIRECT_MODE; > > - platform_set_drvdata(pdev, adc); > + platform_set_drvdata(pdev, iio); > > ret = of_property_read_u32(dev->of_node, "reg", &adc->fl_id); > if (ret != 0 || adc->fl_id >= adc->dfsdm->num_fls) { > @@ -1603,7 +1605,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) > return irq; > > ret = devm_request_irq(dev, irq, stm32_dfsdm_irq, > - 0, pdev->name, adc); > + 0, pdev->name, iio); > if (ret < 0) { > dev_err(dev, "Failed to request IRQ\n"); > return ret; > @@ -1650,8 +1652,8 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev) > > static int stm32_dfsdm_adc_remove(struct platform_device *pdev) > { > - struct stm32_dfsdm_adc *adc = platform_get_drvdata(pdev); > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > > if (adc->dev_data->type == DFSDM_AUDIO) > of_platform_depopulate(&pdev->dev); > @@ -1663,8 +1665,7 @@ static int stm32_dfsdm_adc_remove(struct platform_device *pdev) > > static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev) > { > - struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev); > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > > if (iio_buffer_enabled(indio_dev)) > __stm32_dfsdm_predisable(indio_dev); > @@ -1674,8 +1675,8 @@ static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev) > > static int __maybe_unused stm32_dfsdm_adc_resume(struct device *dev) > { > - struct stm32_dfsdm_adc *adc = dev_get_drvdata(dev); > - struct iio_dev *indio_dev = iio_priv_to_dev(adc); > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); > const struct iio_chan_spec *chan; > struct stm32_dfsdm_channel *ch; > int i, ret;