On Wed, Apr 06, 2016 at 09:03:00AM +0200, Marek Szyprowski wrote:
> Hello,
>
> On 2016-04-06 07:15, Alison Schofield wrote:
> >Driver includes struct regmap and struct device in its global data.
> >Remove the struct device and use regmap API to retrieve device info.
> >
> >Patch created using Coccinelle plus manual edits.
> >
> >Signed-off-by: Alison Schofield <amsfield22@xxxxxxxxx>
>
> This patch changes the struct device which is used by the driver to report
> errors. The driver used correctly the struct device associated with its
> device tree node, while after the patch it will use device which is
> associated with PMU regmap, which is a different device. PMU regmap is there
> only to enable/disable the ADC block and it is not the regmap used to access
> registers of the ADC device.
>
> I would prefer to drop this patch.
>
Thanks Marek! Please check my understanding. Driver is not carrying
a duplicate struct device. The regmap in exynos_adc is *not* this
devices regmap. It belongs to the PMU, (power mgmt unit?)
It seemed excessive to carry around a struct device just for the
dev_err messages, but, we need that struct to extract the correct
iio_dev struct. Without a regmap belonging to this actual device,
no efficiencies can be gained in exynos, and the patch will be
dropped from set v2.
Now I need to be able to recognize such cases elsewhere. I'm going
back though other patches in this set looking for that, but I'm not
so sure I would recognize it.
Jonathan & all, Any hints on the rule of regmap?
Thanks,
alisons
> >---
> > drivers/iio/adc/exynos_adc.c | 18 +++++++++---------
> > 1 file changed, 9 insertions(+), 9 deletions(-)
> >
> >diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
> >index c15756d..0313e0f 100644
> >--- a/drivers/iio/adc/exynos_adc.c
> >+++ b/drivers/iio/adc/exynos_adc.c
> >@@ -130,7 +130,6 @@
> > struct exynos_adc {
> > struct exynos_adc_data *data;
> >- struct device *dev;
> > struct input_dev *input;
> > void __iomem *regs;
> > struct regmap *pmu_map;
> >@@ -173,11 +172,12 @@ static void exynos_adc_unprepare_clk(struct exynos_adc *info)
> > static int exynos_adc_prepare_clk(struct exynos_adc *info)
> > {
> >+ struct device *dev = regmap_get_device(info->pmu_map);
> > int ret;
> > ret = clk_prepare(info->clk);
> > if (ret) {
> >- dev_err(info->dev, "failed preparing adc clock: %d\n", ret);
> >+ dev_err(dev, "failed preparing adc clock: %d\n", ret);
> > return ret;
> > }
> >@@ -185,7 +185,7 @@ static int exynos_adc_prepare_clk(struct exynos_adc *info)
> > ret = clk_prepare(info->sclk);
> > if (ret) {
> > clk_unprepare(info->clk);
> >- dev_err(info->dev,
> >+ dev_err(dev,
> > "failed preparing sclk_adc clock: %d\n", ret);
> > return ret;
> > }
> >@@ -203,11 +203,12 @@ static void exynos_adc_disable_clk(struct exynos_adc *info)
> > static int exynos_adc_enable_clk(struct exynos_adc *info)
> > {
> >+ struct device *dev = regmap_get_device(info->pmu_map);
> > int ret;
> > ret = clk_enable(info->clk);
> > if (ret) {
> >- dev_err(info->dev, "failed enabling adc clock: %d\n", ret);
> >+ dev_err(dev, "failed enabling adc clock: %d\n", ret);
> > return ret;
> > }
> >@@ -215,7 +216,7 @@ static int exynos_adc_enable_clk(struct exynos_adc *info)
> > ret = clk_enable(info->sclk);
> > if (ret) {
> > clk_disable(info->clk);
> >- dev_err(info->dev,
> >+ dev_err(dev,
> > "failed enabling sclk_adc clock: %d\n", ret);
> > return ret;
> > }
> >@@ -610,13 +611,14 @@ static irqreturn_t exynos_adc_isr(int irq, void *dev_id)
> > static irqreturn_t exynos_ts_isr(int irq, void *dev_id)
> > {
> > struct exynos_adc *info = dev_id;
> >- struct iio_dev *dev = dev_get_drvdata(info->dev);
> >+ struct device *dev = regmap_get_device(info->pmu_map);
> >+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
> > u32 x, y;
> > bool pressed;
> > int ret;
> > while (info->input->users) {
> >- ret = exynos_read_s3c64xx_ts(dev, &x, &y);
> >+ ret = exynos_read_s3c64xx_ts(indio_dev, &x, &y);
> > if (ret == -ETIMEDOUT)
> > break;
> >@@ -800,8 +802,6 @@ static int exynos_adc_probe(struct platform_device *pdev)
> > info->tsirq = irq;
> >- info->dev = &pdev->dev;
> >-
> > init_completion(&info->completion);
> > info->clk = devm_clk_get(&pdev->dev, "adc");
>
> Best regards
> --
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
>
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