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Re: [PATCH 1/2] regulator: pbias: use untranslated address to program pbias regulator

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  Re: [PATCH 1/2] regulator: pbias: use untranslated address to  program pbias regulator Tony Lindgren <tony@atomide.com> - 2015-08-05 11:50 +0200
    Re: [PATCH 1/2] regulator: pbias: use untranslated address to program  pbias regulator Kishon Vijay Abraham I <kishon@ti.com> - 2015-08-05 17:00 +0200
      Re: [PATCH 1/2] regulator: pbias: use untranslated address to  program pbias regulator Tony Lindgren <tony@atomide.com> - 2015-08-06 08:30 +0200
        Re: [PATCH 1/2] regulator: pbias: use untranslated address to program  pbias regulator Grygorii Strashko <grygorii.strashko@ti.com> - 2015-08-06 12:00 +0200

#1200588 — Re: [PATCH 1/2] regulator: pbias: use untranslated address to program pbias regulator

* Kishon Vijay Abraham I <kishon@ti.com> [150727 04:27]:
> vsel_reg and enable_reg of the pbias regulator descriptor should actually
> have the offset from syscon. However after the pbias device tree node
> is moved as a child node of syscon, vsel_reg and enable_reg has the
> absolute address because of the address translation that happens while
> creating device from device tree node.
> So avoid using platform_get_resource and use of_get_address in order to
> get only the offset (untranslated address) and populate these in
> vsel_reg and enable_reg.

I think this gets fixed automatically with your other series
adding the "simple-bus" to the nodes. For the children of_ioremap
and friends should do the right thing, but without help from the bus
things won't work right without "simple-bus".

Regards,

Tony
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#1200844 — Re: [PATCH 1/2] regulator: pbias: use untranslated address to program pbias regulator

Hi Tony,

On Wednesday 05 August 2015 03:17 PM, Tony Lindgren wrote:
> * Kishon Vijay Abraham I <kishon@ti.com> [150727 04:27]:
>> vsel_reg and enable_reg of the pbias regulator descriptor should actually
>> have the offset from syscon. However after the pbias device tree node
>> is moved as a child node of syscon, vsel_reg and enable_reg has the
>> absolute address because of the address translation that happens while
>> creating device from device tree node.
>> So avoid using platform_get_resource and use of_get_address in order to
>> get only the offset (untranslated address) and populate these in
>> vsel_reg and enable_reg.
> 
> I think this gets fixed automatically with your other series
> adding the "simple-bus" to the nodes. For the children of_ioremap

Nope. The probe of pbias regulator fails as Grygorii has already pointed out
here [1].

Thanks
Kishon

[1] -> http://www.spinics.net/lists/linux-omap/msg120462.html
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#1201461

* Kishon Vijay Abraham I <kishon@ti.com> [150805 07:59]:
> Hi Tony,
> 
> On Wednesday 05 August 2015 03:17 PM, Tony Lindgren wrote:
> > * Kishon Vijay Abraham I <kishon@ti.com> [150727 04:27]:
> >> vsel_reg and enable_reg of the pbias regulator descriptor should actually
> >> have the offset from syscon. However after the pbias device tree node
> >> is moved as a child node of syscon, vsel_reg and enable_reg has the
> >> absolute address because of the address translation that happens while
> >> creating device from device tree node.
> >> So avoid using platform_get_resource and use of_get_address in order to
> >> get only the offset (untranslated address) and populate these in
> >> vsel_reg and enable_reg.
> > 
> > I think this gets fixed automatically with your other series
> > adding the "simple-bus" to the nodes. For the children of_ioremap
> 
> Nope. The probe of pbias regulator fails as Grygorii has already pointed out
> here [1].

Oh I see, you want the offset from syscon, not the virtual address of
the register. Yeah then it makes sense to me. You could also get the
offset by doing res->start & 0xff or something but I don't know if
that's any better. I guess ideallly we'd have some syscon function
to get the offest from the syscon base if it does not exist already.

Regards,

Tony

 
> [1] -> http://www.spinics.net/lists/linux-omap/msg120462.html
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#1201611 — Re: [PATCH 1/2] regulator: pbias: use untranslated address to program pbias regulator

On 08/06/2015 09:26 AM, Tony Lindgren wrote:
> * Kishon Vijay Abraham I <kishon@ti.com> [150805 07:59]:
>> Hi Tony,
>>
>> On Wednesday 05 August 2015 03:17 PM, Tony Lindgren wrote:
>>> * Kishon Vijay Abraham I <kishon@ti.com> [150727 04:27]:
>>>> vsel_reg and enable_reg of the pbias regulator descriptor should actually
>>>> have the offset from syscon. However after the pbias device tree node
>>>> is moved as a child node of syscon, vsel_reg and enable_reg has the
>>>> absolute address because of the address translation that happens while
>>>> creating device from device tree node.
>>>> So avoid using platform_get_resource and use of_get_address in order to
>>>> get only the offset (untranslated address) and populate these in
>>>> vsel_reg and enable_reg.
>>>
>>> I think this gets fixed automatically with your other series
>>> adding the "simple-bus" to the nodes. For the children of_ioremap
>>
>> Nope. The probe of pbias regulator fails as Grygorii has already pointed out
>> here [1].
> 
> Oh I see, you want the offset from syscon, not the virtual address of
> the register. Yeah then it makes sense to me. You could also get the
> offset by doing res->start & 0xff or something but I don't know if
> that's any better. I guess ideallly we'd have some syscon function
> to get the offest from the syscon base if it does not exist already.

Hypothetically, the "syscon" property can be used to get register offset
syscon = <&scm_conf 0xe00>;
and even "reg" property can be dropped if driver uses syscon/regmap only for io.

But, in this particular case, such change will lead to DT compatibility issues :(

-- 
regards,
-grygorii
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