[PATCH 3/9] clk: sunxi: Add prcm mod0 clock driver

[hdegoede@redhat.com (Hans de Goede)]

Hi,

On 07-12-14 19:08, Maxime Ripard wrote:
> On Wed, Dec 03, 2014 at 10:49:20AM +0100, Hans de Goede wrote:

<snip>

>> So it should not have a simple-bus compatible either, and as such we cannot
>> simply change the mod0 driver from of_clk_define to a platform driver because
>> then we need to instantiate platform devs for the mod0 clock nodes, which
>> means making the clock node a simple-bus.
>
> I guess we can do that as a temporary measure until we get things
> right on that front. I'm totally open to doing that work, so I'm not
> asking you to do it.
>
>> I can see your logic in wanting the ir_clk prcm sub-node to use the
>> mod0 compatible string, so how about we make the mod0 driver both
>> register through of_declare and as a platform driver. Note this means
>> that it will try to bind twice to the ir_clk node, since of_clk_declare
>> will cause it to try and bind there too AFAIK.
>
> Hmmm, I could live with that for a while too. That shouldn't even
> require too much work, since the first thing we check in the mod0 code
> is that we actually have something in reg, which will not be the case
> in the OF_CLK_DECLARE case.
>
>> The of_clk_declare bind will fail though because there is no regs
>> property, so this double bind is not an issue as long as we do not
>> log errors on the first bind failure.
>
> Yep, exactly.
>
>> Note that the ir_clk node will still need an "ir-clk" compatible as
>> well for the MFD to find it and assign the proper resources to it.
>
> No, it really doesn't. At least for now, we have a single mod0 clock
> under the PRCM MFD. If (and only if) one day, we find ourselves in a
> position where we have two mod0 clocks under the PRCM, then we'll fix
> the MFD code to deal with that, because it really should deal with it.

Ok, using only the mod0 compat string works for me. I'll respin my
patch-set (minus the one patch you've already merged) to make the modo
clk driver use both of_clk_declare and make it a platfrom driver, and
use the mod0 compat string for the ir-clk node.

Not sure when I'll get this done exactly though, but we still have
a while before 3.20 :)

Regards,

Hans