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SubjectRe: [PATCH v4 1/4] mfd: mxs-lradc: Add support for mxs-lradc MFD
On Mon, 15 Aug 2016, Jonathan Cameron wrote:

> On 05/08/16 08:02, Lee Jones wrote:
> > On Thu, 04 Aug 2016, Alexander Stein wrote:
> >
> >> On Thursday 04 August 2016 15:28:18, Ksenija Stanojevic wrote:
> >>> Add core files for mxs-lradc MFD driver.
> >>>
> >>> Note: this patch won't compile in iio/testing without this patch:
> >>> a8f447be8056 ("mfd: Add resource managed APIs for mfd_add_devices")
> >>>
> >>> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> >>> ---
> >>> [...]
> >>> +static int mxs_lradc_probe(struct platform_device *pdev)
> >>> +{
> >>> + const struct of_device_id *of_id;
> >>> + struct device *dev = &pdev->dev;
> >>> + struct device_node *node = dev->of_node;
> >>> + struct mxs_lradc *lradc;
> >>> + struct resource *iores;
> >>> + struct mfd_cell *cells = NULL;
> >>> + int ret = 0;
> >>> + u32 ts_wires = 0;
> >>> +
> >>> + lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
> >>> + if (!lradc)
> >>> + return -ENOMEM;
> >>> +
> >>> + of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
> >>> + lradc->soc = (enum mxs_lradc_id)of_id->data;
> >>> +
> >>> + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>> + lradc->base = devm_ioremap_resource(dev, iores);
> >>
> >> Out of couriosity: Is it common to pass already ioremapped addresses to (MFD
> >> cell) platform drivers? I would have expected, and done myself, that ioremap
> >> is done in the driver itself, same as the IRQ.
> >
> > Yes, this is exactly what should happen.
> >
> Lee, you've confused me with this answer. Yes, it is common or Yes it
> should have been done the way Alexander suggested?

The remapping and IRQ obtainment should be done in the leaf driver.

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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