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Date: Sun, 24 May 2020 14:13:06 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc: <linux-iio@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
<alexandre.torgue@...com>
Subject: Re: [PATCH] iio: stm32-dfsdm-adc: keep a reference to the iio
device on the state struct
On Fri, 22 May 2020 16:08:04 +0300
Alexandru Ardelean <alexandru.ardelean@...log.com> 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.
>
> For this driver, not using iio_priv_to_dev(), means keeping a reference to
> the IIO device on the state struct.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
As this one is a bit simpler, I think the case for just changing the callbacks
to take the iio_dev directly is stronger than adding this level of indirection.
Again, perhaps I'm missing something.
Jonathan
> ---
> drivers/iio/adc/stm32-dfsdm-adc.c | 20 +++++++++++---------
> 1 file changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> index 76a60d93fe23..ff7a6afa4558 100644
> --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> @@ -69,6 +69,7 @@ struct stm32_dfsdm_dev_data {
>
> struct stm32_dfsdm_adc {
> struct stm32_dfsdm *dfsdm;
> + struct iio_dev *indio_dev;
> const struct stm32_dfsdm_dev_data *dev_data;
> unsigned int fl_id;
> unsigned int nconv;
> @@ -332,7 +333,7 @@ static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev,
>
> static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct iio_dev *indio_dev = adc->indio_dev;
> struct regmap *regmap = adc->dfsdm->regmap;
> const struct iio_chan_spec *chan;
> unsigned int bit;
> @@ -352,7 +353,7 @@ static int stm32_dfsdm_start_channel(struct stm32_dfsdm_adc *adc)
>
> static void stm32_dfsdm_stop_channel(struct stm32_dfsdm_adc *adc)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct iio_dev *indio_dev = adc->indio_dev;
> struct regmap *regmap = adc->dfsdm->regmap;
> const struct iio_chan_spec *chan;
> unsigned int bit;
> @@ -422,7 +423,7 @@ static int stm32_dfsdm_filter_set_trig(struct stm32_dfsdm_adc *adc,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct iio_dev *indio_dev = adc->indio_dev;
> struct regmap *regmap = adc->dfsdm->regmap;
> u32 jextsel = 0, jexten = STM32_DFSDM_JEXTEN_DISABLED;
> int ret;
> @@ -451,7 +452,7 @@ static int stm32_dfsdm_channels_configure(struct stm32_dfsdm_adc *adc,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct iio_dev *indio_dev = adc->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];
> @@ -495,7 +496,7 @@ static int stm32_dfsdm_filter_configure(struct stm32_dfsdm_adc *adc,
> unsigned int fl_id,
> struct iio_trigger *trig)
> {
> - struct iio_dev *indio_dev = iio_priv_to_dev(adc);
> + struct iio_dev *indio_dev = adc->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];
> @@ -1314,7 +1315,7 @@ 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 = adc->indio_dev;
> struct regmap *regmap = adc->dfsdm->regmap;
> unsigned int status, int_en;
>
> @@ -1569,6 +1570,7 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
>
> adc = iio_priv(iio);
> adc->dfsdm = dev_get_drvdata(dev->parent);
> + adc->indio_dev = iio;
>
> iio->dev.parent = dev;
> iio->dev.of_node = np;
> @@ -1651,7 +1653,7 @@ 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 = adc->indio_dev;
>
> if (adc->dev_data->type == DFSDM_AUDIO)
> of_platform_depopulate(&pdev->dev);
> @@ -1664,7 +1666,7 @@ 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 = adc->indio_dev;
>
> if (iio_buffer_enabled(indio_dev))
> __stm32_dfsdm_predisable(indio_dev);
> @@ -1675,7 +1677,7 @@ 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 = adc->indio_dev;
> const struct iio_chan_spec *chan;
> struct stm32_dfsdm_channel *ch;
> int i, ret;
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