[PATCH v1 02/16] dt-bindings: rtc: mediatek: add bindings for PMIC RTC
Alexandre Belloni
alexandre.belloni at free-electrons.com
Wed Mar 28 02:19:41 PDT 2018
On 28/03/2018 at 11:53:17 +0800, Sean Wang wrote:
> On Tue, 2018-03-27 at 17:18 +0200, Alexandre Belloni wrote:
> > On 25/03/2018 at 03:36:28 +0800, Sean Wang wrote:
> > > just reply both replies in the same mail
> > >
> > > 1.) the power-off device is a part of rtc, use the same registers rtc
> > > has and thus it is put as child nodes under the node rtc to reflect the
> > > reality of characteristics the rtc has.
> > >
> > > Or am I wrong for a certain aspect in these opinions?
> > >
> >
> > My point is that it is also part of the PMIC so it may as well be
> > registers from the mfd driver which already registers a bunch of devices
> > instead of doing unusual stuff from the rtc driver.
> >
> > mt6397_rtc->regmap is mt6397_chip->regmap anyway. You have the added
> > benefit that if the RTC driver probe fails for some reason, you may
> > still be able to probe the reset driver.
> >
> > I don't tink there is any benefit having it as a child of the rtc
> > device.
> >
>
>
> really thanks! it's an optional solution I thought it 's fine and worth
> doing
>
> but so far I cannot fully make sure of whether mfd can accept two
> devices holding overlay IORESOURCE_MEM.
>
There is no overlay because you are using a regmap which handles
concurrency for you.
What your patch is doing is:
struct mt6397_rtc *rtc = dev_get_drvdata(pdev->dev.parent);
then you use rtc->regmap
But in the rtc driver, you have:
struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
struct mt6397_rtc *rtc;
rtc->regmap = mt6397_chip->regmap;
So there is no benefit from being the child of the rtc, you could just
do the following in your reset driver:
struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
and then use mt6397_chip->regmap.
--
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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