Re: [PATCH 1/3 v5] usb: phy-samsung-usb: Simplify PMU register handling

[Tomasz Figa]

Hi Julius,

On Thursday 08 of August 2013 11:06:54 Julius Werner wrote:
> > I'm not sure I understand. The old documentation referred to the
> > USBDEVICE_PHY_CONTROL and USBHOST_PHY_CONTROL registers for a phy, and
> > your new version only refers to (usb device) PHY_CONTROL. Regardless
> > of
> > multiple phys, you're suggesting that we describe less of each phy.
> > That seems like taking away usable information. Unless I've
> > misunderstood?
> 
> Well that's just the thing that's confusing right now, and which I am
> trying to fix: every PHY is either DEVICE or HOST and thus has only
> one PMU register. The current code describes the PMU register space
> for all PHYs on the system in the DT entry of every PHY and then
> calculates which register to use with hardcoded offsets. I think it
> makes much more sense if every PHY only describes its own register and
> doesn't need to do address arithmetic later on.
> 
> As Vivek said there is one exception in an old Exynos4,

Not that old yet. :)

> but that is
> currently not implemented in the upstream kernel anyway

Sorry, I don't understand what is not implemented. Without your patch, the 
PHY driver handles both PMU registers of Exynos4.

Best regards,
Tomasz

> , and if it
> ever will be it's still much easier to special case one weird chip
> than to have a super complicated and confusing mechanism for all of
> them.
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