[PATCHv6] ARM: dts: add exynos5422-cpus.dtsi to correct cpu order

[Kukjin Kim]

Krzysztof Kozlowski wrote:
> 
> On 14.07.2015 09:24, Chanho Park wrote:
> > The odroid-xu3 board which is based on exynos5422 not exynos5800 is
> > booted from cortex-a7 core unlike exynos5800. The odroid-xu3's cpu order
> > is quite strange. cpu0 and cpu5-7 are cortex-a7 cores and cpu1-4 are
> > cortex-a15 cores. To correct this mis-odering, I added exynos5422-cpus.dtsi
> > and reversing cpu orders from exynos5420. Now, cpu0-3 are cortex-a7 and
> > cpu4-7 are cortex-a15.
> >
> > Reviewed-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
> > Signed-off-by: Chanho Park <parkch98 at gmail.com>
> > ---
> > Change from v4:
> >  - Resend patch with correct signed-off
> >
> > Changes from v4:
> >  - Remove temporal patch in e-mail body
> >
> > Changes from v3:
> >  - include this exynos5422-cpus.dtsi in the exynos5422-odroidxu3-common.dtsi
> >
> > Changes from v2:
> >  - drop inclusion of exynos5420.dtsi from exynos5422-cpus.dtsi
> >  - drop compatibles from exynos5422-cpus.dtsi
> >
> > Changes from v1:
> >  - rename exynos5422.dtsi to exynos5422-cpus.dtsi
> >  - include the dtsi file top of the exynos5422-odroidxu3.dts
> >
> > Secondary cpu booting problem[1] is not resolved yet. Need more investigations
> > to work booting 8 cores correctly.
> >
> > [1]: http://www.spinics.net/lists/linux-samsung-soc/msg45525.html
> >
> >  arch/arm/boot/dts/exynos5422-cpus.dtsi             | 81 ++++++++++++++++++++++
> >  arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi |  1 +
> >  2 files changed, 82 insertions(+)
> >  create mode 100644 arch/arm/boot/dts/exynos5422-cpus.dtsi
> 
> Thanks, applied to my tree. I'll send it to Kukjin for v4.3 unless he
> picks it also.
> 
Well, let me see. I'm thinking we need to sort out the cpu ordering and dtsi
inclusions for exynos5420, 5422 and 5800 related to DT files.

See, 

1) exynos5420 DT (cpu0~3: a15, cpu 4~7: a7)
2) exynos5800 DT is including exynos5420 DT
3) exynos5422 and exynos5800 based boards are including exynos5800 DT.

Then making exynos5422-cpus DT for exynos5422 based boards?
(cpu0~3: a7, cpu4~7: a15)

I think, it could cause confusion when new board based on them are added
because it's not clear and the boot cpu could be selected by bootloader part.

So how about creating exynos5422-cpus and exynos5420-cpus then including the
cpus DT file in each board accordingly?

Or more clear way to avoid confusion?

- Kukjin