diff mbox series

[5/9] ARM: dts: exynos: move exynos-bus nodes out of soc in Exynos4412

Message ID 20230125094513.155063-5-krzysztof.kozlowski@linaro.org
State New
Headers show
Series [1/9] ARM: dts: exynos: correct HDMI phy compatible in Exynos4 | expand

Commit Message

Krzysztof Kozlowski Jan. 25, 2023, 9:45 a.m. UTC
The soc node is supposed to have only device nodes with MMIO addresses,
as reported by dtc W=1:

  exynos4412.dtsi:407.20-413.5:
    Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property

and dtbs_check:

  exynos4412-i9300.dtb: soc: bus-acp:
    {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}

Move the bus nodes and their OPP tables out of SoC to fix this.
Re-order them alphabetically while moving and put some of the OPP tables
in device nodes (if they are not shared).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 arch/arm/boot/dts/exynos4412.dtsi | 351 +++++++++++++++---------------
 1 file changed, 175 insertions(+), 176 deletions(-)

Comments

Krzysztof Kozlowski Jan. 29, 2023, 10:42 a.m. UTC | #1
On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
> The soc node is supposed to have only device nodes with MMIO addresses,
> as reported by dtc W=1:
> 
>   exynos4412.dtsi:407.20-413.5:
>     Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
> 
> and dtbs_check:
> 
>   exynos4412-i9300.dtb: soc: bus-acp:
>     {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
> 
> Move the bus nodes and their OPP tables out of SoC to fix this.
> Re-order them alphabetically while moving and put some of the OPP tables
> in device nodes (if they are not shared).
> 

Applied.

Best regards,
Krzysztof
Marek Szyprowski Feb. 3, 2023, 11:45 a.m. UTC | #2
Hi Krzysztof,

On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>> The soc node is supposed to have only device nodes with MMIO addresses,
>> as reported by dtc W=1:
>>
>>    exynos4412.dtsi:407.20-413.5:
>>      Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>
>> and dtbs_check:
>>
>>    exynos4412-i9300.dtb: soc: bus-acp:
>>      {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>
>> Move the bus nodes and their OPP tables out of SoC to fix this.
>> Re-order them alphabetically while moving and put some of the OPP tables
>> in device nodes (if they are not shared).
>>
> Applied.

I don't have a good news. It looks that this change is responsible for 
breaking boards that were rock-stable so far, like Odroid U3. I didn't 
manage to analyze what exactly causes the issue, but it looks that the 
exynos-bus devfreq driver somehow depends on the order of the nodes:

(before)

# dmesg | grep exynos-bus
[    6.415266] exynos-bus: new bus device registered: soc:bus-dmc 
(100000 KHz ~ 400000 KHz)
[    6.422717] exynos-bus: new bus device registered: soc:bus-acp 
(100000 KHz ~ 267000 KHz)
[    6.454323] exynos-bus: new bus device registered: soc:bus-c2c 
(100000 KHz ~ 400000 KHz)
[    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus 
(100000 KHz ~ 200000 KHz)
[    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus 
(100000 KHz ~ 200000 KHz)
[    6.494612] exynos-bus: new bus device registered: soc:bus-display 
(160000 KHz ~ 200000 KHz)
[    6.494932] exynos-bus: new bus device registered: soc:bus-fsys 
(100000 KHz ~ 134000 KHz)
[    6.495246] exynos-bus: new bus device registered: soc:bus-peri ( 
50000 KHz ~ 100000 KHz)
[    6.495577] exynos-bus: new bus device registered: soc:bus-mfc 
(100000 KHz ~ 200000 KHz)

(after)

# dmesg | grep exynos-bus

[    6.082032] exynos-bus: new bus device registered: bus-dmc (100000 
KHz ~ 400000 KHz)
[    6.122726] exynos-bus: new bus device registered: bus-leftbus 
(100000 KHz ~ 200000 KHz)
[    6.146705] exynos-bus: new bus device registered: bus-mfc (100000 
KHz ~ 200000 KHz)
[    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000 
KHz ~ 100000 KHz)
[    6.204770] exynos-bus: new bus device registered: bus-rightbus 
(100000 KHz ~ 200000 KHz)
[    6.211087] exynos-bus: new bus device registered: bus-acp (100000 
KHz ~ 267000 KHz)
[    6.216936] exynos-bus: new bus device registered: bus-c2c (100000 
KHz ~ 400000 KHz)
[    6.225748] exynos-bus: new bus device registered: bus-display 
(160000 KHz ~ 200000 KHz)
[    6.242978] exynos-bus: new bus device registered: bus-fsys (100000 
KHz ~ 134000 KHz)

This is definitely a driver bug, but so far it worked fine, so this is a 
regression that need to be addressed somehow...

Best regards
Marek Szyprowski Feb. 3, 2023, 11:51 a.m. UTC | #3
On 03.02.2023 12:46, Krzysztof Kozlowski wrote:
> On 03/02/2023 12:45, Marek Szyprowski wrote:
>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>>> as reported by dtc W=1:
>>>>
>>>>     exynos4412.dtsi:407.20-413.5:
>>>>       Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>>>
>>>> and dtbs_check:
>>>>
>>>>     exynos4412-i9300.dtb: soc: bus-acp:
>>>>       {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>>>
>>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>>> Re-order them alphabetically while moving and put some of the OPP tables
>>>> in device nodes (if they are not shared).
>>>>
>>> Applied.
>> I don't have a good news. It looks that this change is responsible for
>> breaking boards that were rock-stable so far, like Odroid U3. I didn't
>> manage to analyze what exactly causes the issue, but it looks that the
>> exynos-bus devfreq driver somehow depends on the order of the nodes:
>>
>> (before)
>>
>> # dmesg | grep exynos-bus
>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc
>> (100000 KHz ~ 400000 KHz)
>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp
>> (100000 KHz ~ 267000 KHz)
>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c
>> (100000 KHz ~ 400000 KHz)
>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus
>> (100000 KHz ~ 200000 KHz)
>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus
>> (100000 KHz ~ 200000 KHz)
>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display
>> (160000 KHz ~ 200000 KHz)
>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys
>> (100000 KHz ~ 134000 KHz)
>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri (
>> 50000 KHz ~ 100000 KHz)
>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc
>> (100000 KHz ~ 200000 KHz)
>>
>> (after)
>>
>> # dmesg | grep exynos-bus
>>
>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000
>> KHz ~ 400000 KHz)
>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus
>> (100000 KHz ~ 200000 KHz)
>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000
>> KHz ~ 200000 KHz)
>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000
>> KHz ~ 100000 KHz)
>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus
>> (100000 KHz ~ 200000 KHz)
>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000
>> KHz ~ 267000 KHz)
>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000
>> KHz ~ 400000 KHz)
>> [    6.225748] exynos-bus: new bus device registered: bus-display
>> (160000 KHz ~ 200000 KHz)
>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000
>> KHz ~ 134000 KHz)
>>
>> This is definitely a driver bug, but so far it worked fine, so this is a
>> regression that need to be addressed somehow...
>
> Thanks for checking, but what is exactly the bug? The devices registered
> - just with different name.

The bug is that the board fails to boot from time to time, freezing 
after registering PPMU counters...

Best regards
Marek Szyprowski Feb. 3, 2023, 10:50 p.m. UTC | #4
On 03.02.2023 22:12, Krzysztof Kozlowski wrote:
> On 03/02/2023 21:34, Krzysztof Kozlowski wrote:
>> On 03/02/2023 12:51, Marek Szyprowski wrote:
>>> On 03.02.2023 12:46, Krzysztof Kozlowski wrote:
>>>> On 03/02/2023 12:45, Marek Szyprowski wrote:
>>>>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
>>>>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>>>>>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>>>>>> as reported by dtc W=1:
>>>>>>>
>>>>>>>      exynos4412.dtsi:407.20-413.5:
>>>>>>>        Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>>>>>>
>>>>>>> and dtbs_check:
>>>>>>>
>>>>>>>      exynos4412-i9300.dtb: soc: bus-acp:
>>>>>>>        {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>>>>>>
>>>>>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>>>>>> Re-order them alphabetically while moving and put some of the OPP tables
>>>>>>> in device nodes (if they are not shared).
>>>>>>>
>>>>>> Applied.
>>>>> I don't have a good news. It looks that this change is responsible for
>>>>> breaking boards that were rock-stable so far, like Odroid U3. I didn't
>>>>> manage to analyze what exactly causes the issue, but it looks that the
>>>>> exynos-bus devfreq driver somehow depends on the order of the nodes:
>>>>>
>>>>> (before)
>>>>>
>>>>> # dmesg | grep exynos-bus
>>>>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc
>>>>> (100000 KHz ~ 400000 KHz)
>>>>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp
>>>>> (100000 KHz ~ 267000 KHz)
>>>>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c
>>>>> (100000 KHz ~ 400000 KHz)
>>>>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus
>>>>> (100000 KHz ~ 200000 KHz)
>>>>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus
>>>>> (100000 KHz ~ 200000 KHz)
>>>>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display
>>>>> (160000 KHz ~ 200000 KHz)
>>>>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys
>>>>> (100000 KHz ~ 134000 KHz)
>>>>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri (
>>>>> 50000 KHz ~ 100000 KHz)
>>>>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc
>>>>> (100000 KHz ~ 200000 KHz)
>>>>>
>>>>> (after)
>>>>>
>>>>> # dmesg | grep exynos-bus
>>>>>
>>>>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000
>>>>> KHz ~ 400000 KHz)
>>>>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus
>>>>> (100000 KHz ~ 200000 KHz)
>>>>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000
>>>>> KHz ~ 200000 KHz)
>>>>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000
>>>>> KHz ~ 100000 KHz)
>>>>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus
>>>>> (100000 KHz ~ 200000 KHz)
>>>>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000
>>>>> KHz ~ 267000 KHz)
>>>>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000
>>>>> KHz ~ 400000 KHz)
>>>>> [    6.225748] exynos-bus: new bus device registered: bus-display
>>>>> (160000 KHz ~ 200000 KHz)
>>>>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000
>>>>> KHz ~ 134000 KHz)
>>>>>
>>>>> This is definitely a driver bug, but so far it worked fine, so this is a
>>>>> regression that need to be addressed somehow...
>>>> Thanks for checking, but what is exactly the bug? The devices registered
>>>> - just with different name.
>>> The bug is that the board fails to boot from time to time, freezing
>>> after registering PPMU counters...
>> My U3 with and without this patch, reports several warnings:
>> iommu_group_do_set_platform_dma()
>> exynos_iommu_domain_free()
>> clk_core_enable()
>>
>> and finally:
>> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
>>
>> and keeps stalling.
>>
>> At least on next-20230203. Except all these (which anyway make board
>> unbootable) look fine around PMU and exynos-bus.
> I also booted few times my next/dt branch (with this patch) and no
> problems. How reproducible is the issue you experience?

IOMMU needs a fixup, that has been merged today:

https://lore.kernel.org/all/20230123093102.12392-1-m.szyprowski@samsung.com/

I was initially convinced that this freeze is somehow related to this 
IOMMU fixup, but it turned out that the devfreq is a source of the problems.

The freeze happens here about 1 of 10 boots, usually with kernel 
compiled from multi_v7_defconfig, while loading the PPMU modules. It 
happens on your next/dt branch too.

Best regards
Krzysztof Kozlowski Feb. 6, 2023, 4:12 p.m. UTC | #5
On 03/02/2023 23:50, Marek Szyprowski wrote:
> On 03.02.2023 22:12, Krzysztof Kozlowski wrote:
>> On 03/02/2023 21:34, Krzysztof Kozlowski wrote:
>>> On 03/02/2023 12:51, Marek Szyprowski wrote:
>>>> On 03.02.2023 12:46, Krzysztof Kozlowski wrote:
>>>>> On 03/02/2023 12:45, Marek Szyprowski wrote:
>>>>>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
>>>>>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>>>>>>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>>>>>>> as reported by dtc W=1:
>>>>>>>>
>>>>>>>>      exynos4412.dtsi:407.20-413.5:
>>>>>>>>        Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>>>>>>>
>>>>>>>> and dtbs_check:
>>>>>>>>
>>>>>>>>      exynos4412-i9300.dtb: soc: bus-acp:
>>>>>>>>        {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>>>>>>>
>>>>>>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>>>>>>> Re-order them alphabetically while moving and put some of the OPP tables
>>>>>>>> in device nodes (if they are not shared).
>>>>>>>>
>>>>>>> Applied.
>>>>>> I don't have a good news. It looks that this change is responsible for
>>>>>> breaking boards that were rock-stable so far, like Odroid U3. I didn't
>>>>>> manage to analyze what exactly causes the issue, but it looks that the
>>>>>> exynos-bus devfreq driver somehow depends on the order of the nodes:
>>>>>>
>>>>>> (before)
>>>>>>
>>>>>> # dmesg | grep exynos-bus
>>>>>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc
>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp
>>>>>> (100000 KHz ~ 267000 KHz)
>>>>>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c
>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus
>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus
>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display
>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys
>>>>>> (100000 KHz ~ 134000 KHz)
>>>>>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri (
>>>>>> 50000 KHz ~ 100000 KHz)
>>>>>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc
>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>
>>>>>> (after)
>>>>>>
>>>>>> # dmesg | grep exynos-bus
>>>>>>
>>>>>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000
>>>>>> KHz ~ 400000 KHz)
>>>>>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus
>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000
>>>>>> KHz ~ 200000 KHz)
>>>>>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000
>>>>>> KHz ~ 100000 KHz)
>>>>>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus
>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000
>>>>>> KHz ~ 267000 KHz)
>>>>>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000
>>>>>> KHz ~ 400000 KHz)
>>>>>> [    6.225748] exynos-bus: new bus device registered: bus-display
>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000
>>>>>> KHz ~ 134000 KHz)
>>>>>>
>>>>>> This is definitely a driver bug, but so far it worked fine, so this is a
>>>>>> regression that need to be addressed somehow...
>>>>> Thanks for checking, but what is exactly the bug? The devices registered
>>>>> - just with different name.
>>>> The bug is that the board fails to boot from time to time, freezing
>>>> after registering PPMU counters...
>>> My U3 with and without this patch, reports several warnings:
>>> iommu_group_do_set_platform_dma()
>>> exynos_iommu_domain_free()
>>> clk_core_enable()
>>>
>>> and finally:
>>> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
>>>
>>> and keeps stalling.
>>>
>>> At least on next-20230203. Except all these (which anyway make board
>>> unbootable) look fine around PMU and exynos-bus.
>> I also booted few times my next/dt branch (with this patch) and no
>> problems. How reproducible is the issue you experience?
> 
> IOMMU needs a fixup, that has been merged today:
> 
> https://lore.kernel.org/all/20230123093102.12392-1-m.szyprowski@samsung.com/
> 
> I was initially convinced that this freeze is somehow related to this 
> IOMMU fixup, but it turned out that the devfreq is a source of the problems.
> 
> The freeze happens here about 1 of 10 boots, usually with kernel 
> compiled from multi_v7_defconfig, while loading the PPMU modules. It 
> happens on your next/dt branch too.

I was able to reproduce it easily with multi_v7. Then I commented out
dmc bus which fixed the issue. Then I commented out acp and c2c buses
(children/passive) which also fixed the issue. Then I uncommented
everything and went back to next/dt - exactly the same as it was failing
- and since then I cannot reproduce it. I triple checked, but now my
multi_v7 on U3 on next/dt boots perfectly fine. Every time.

Best regards,
Krzysztof
Marek Szyprowski March 24, 2023, 5:07 p.m. UTC | #6
On 06.02.2023 17:12, Krzysztof Kozlowski wrote:
> On 03/02/2023 23:50, Marek Szyprowski wrote:
>> On 03.02.2023 22:12, Krzysztof Kozlowski wrote:
>>> On 03/02/2023 21:34, Krzysztof Kozlowski wrote:
>>>> On 03/02/2023 12:51, Marek Szyprowski wrote:
>>>>> On 03.02.2023 12:46, Krzysztof Kozlowski wrote:
>>>>>> On 03/02/2023 12:45, Marek Szyprowski wrote:
>>>>>>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
>>>>>>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>>>>>>>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>>>>>>>> as reported by dtc W=1:
>>>>>>>>>
>>>>>>>>>       exynos4412.dtsi:407.20-413.5:
>>>>>>>>>         Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>>>>>>>>
>>>>>>>>> and dtbs_check:
>>>>>>>>>
>>>>>>>>>       exynos4412-i9300.dtb: soc: bus-acp:
>>>>>>>>>         {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>>>>>>>>
>>>>>>>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>>>>>>>> Re-order them alphabetically while moving and put some of the OPP tables
>>>>>>>>> in device nodes (if they are not shared).
>>>>>>>>>
>>>>>>>> Applied.
>>>>>>> I don't have a good news. It looks that this change is responsible for
>>>>>>> breaking boards that were rock-stable so far, like Odroid U3. I didn't
>>>>>>> manage to analyze what exactly causes the issue, but it looks that the
>>>>>>> exynos-bus devfreq driver somehow depends on the order of the nodes:
>>>>>>>
>>>>>>> (before)
>>>>>>>
>>>>>>> # dmesg | grep exynos-bus
>>>>>>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc
>>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp
>>>>>>> (100000 KHz ~ 267000 KHz)
>>>>>>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c
>>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus
>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus
>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display
>>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys
>>>>>>> (100000 KHz ~ 134000 KHz)
>>>>>>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri (
>>>>>>> 50000 KHz ~ 100000 KHz)
>>>>>>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc
>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>
>>>>>>> (after)
>>>>>>>
>>>>>>> # dmesg | grep exynos-bus
>>>>>>>
>>>>>>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000
>>>>>>> KHz ~ 400000 KHz)
>>>>>>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus
>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000
>>>>>>> KHz ~ 200000 KHz)
>>>>>>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000
>>>>>>> KHz ~ 100000 KHz)
>>>>>>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus
>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000
>>>>>>> KHz ~ 267000 KHz)
>>>>>>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000
>>>>>>> KHz ~ 400000 KHz)
>>>>>>> [    6.225748] exynos-bus: new bus device registered: bus-display
>>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000
>>>>>>> KHz ~ 134000 KHz)
>>>>>>>
>>>>>>> This is definitely a driver bug, but so far it worked fine, so this is a
>>>>>>> regression that need to be addressed somehow...
>>>>>> Thanks for checking, but what is exactly the bug? The devices registered
>>>>>> - just with different name.
>>>>> The bug is that the board fails to boot from time to time, freezing
>>>>> after registering PPMU counters...
>>>> My U3 with and without this patch, reports several warnings:
>>>> iommu_group_do_set_platform_dma()
>>>> exynos_iommu_domain_free()
>>>> clk_core_enable()
>>>>
>>>> and finally:
>>>> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
>>>>
>>>> and keeps stalling.
>>>>
>>>> At least on next-20230203. Except all these (which anyway make board
>>>> unbootable) look fine around PMU and exynos-bus.
>>> I also booted few times my next/dt branch (with this patch) and no
>>> problems. How reproducible is the issue you experience?
>> IOMMU needs a fixup, that has been merged today:
>>
>> https://lore.kernel.org/all/20230123093102.12392-1-m.szyprowski@samsung.com/
>>
>> I was initially convinced that this freeze is somehow related to this
>> IOMMU fixup, but it turned out that the devfreq is a source of the problems.
>>
>> The freeze happens here about 1 of 10 boots, usually with kernel
>> compiled from multi_v7_defconfig, while loading the PPMU modules. It
>> happens on your next/dt branch too.
> I was able to reproduce it easily with multi_v7. Then I commented out
> dmc bus which fixed the issue. Then I commented out acp and c2c buses
> (children/passive) which also fixed the issue. Then I uncommented
> everything and went back to next/dt - exactly the same as it was failing
> - and since then I cannot reproduce it. I triple checked, but now my
> multi_v7 on U3 on next/dt boots perfectly fine. Every time.

This issue still happens from time to time. I quick workaround to fix it 
is to add:

MODULE_SOFTDEP("pre: exynos_ppmu");

to the exynos-bus driver. Is it acceptable solution?


Best regards
Krzysztof Kozlowski March 24, 2023, 6:52 p.m. UTC | #7
On 24/03/2023 18:07, Marek Szyprowski wrote:
> On 06.02.2023 17:12, Krzysztof Kozlowski wrote:
>> On 03/02/2023 23:50, Marek Szyprowski wrote:
>>> On 03.02.2023 22:12, Krzysztof Kozlowski wrote:
>>>> On 03/02/2023 21:34, Krzysztof Kozlowski wrote:
>>>>> On 03/02/2023 12:51, Marek Szyprowski wrote:
>>>>>> On 03.02.2023 12:46, Krzysztof Kozlowski wrote:
>>>>>>> On 03/02/2023 12:45, Marek Szyprowski wrote:
>>>>>>>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote:
>>>>>>>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote:
>>>>>>>>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>>>>>>>>> as reported by dtc W=1:
>>>>>>>>>>
>>>>>>>>>>       exynos4412.dtsi:407.20-413.5:
>>>>>>>>>>         Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property
>>>>>>>>>>
>>>>>>>>>> and dtbs_check:
>>>>>>>>>>
>>>>>>>>>>       exynos4412-i9300.dtb: soc: bus-acp:
>>>>>>>>>>         {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'}
>>>>>>>>>>
>>>>>>>>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>>>>>>>>> Re-order them alphabetically while moving and put some of the OPP tables
>>>>>>>>>> in device nodes (if they are not shared).
>>>>>>>>>>
>>>>>>>>> Applied.
>>>>>>>> I don't have a good news. It looks that this change is responsible for
>>>>>>>> breaking boards that were rock-stable so far, like Odroid U3. I didn't
>>>>>>>> manage to analyze what exactly causes the issue, but it looks that the
>>>>>>>> exynos-bus devfreq driver somehow depends on the order of the nodes:
>>>>>>>>
>>>>>>>> (before)
>>>>>>>>
>>>>>>>> # dmesg | grep exynos-bus
>>>>>>>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc
>>>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>>>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp
>>>>>>>> (100000 KHz ~ 267000 KHz)
>>>>>>>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c
>>>>>>>> (100000 KHz ~ 400000 KHz)
>>>>>>>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus
>>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus
>>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display
>>>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>>>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys
>>>>>>>> (100000 KHz ~ 134000 KHz)
>>>>>>>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri (
>>>>>>>> 50000 KHz ~ 100000 KHz)
>>>>>>>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc
>>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>>
>>>>>>>> (after)
>>>>>>>>
>>>>>>>> # dmesg | grep exynos-bus
>>>>>>>>
>>>>>>>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000
>>>>>>>> KHz ~ 400000 KHz)
>>>>>>>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus
>>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000
>>>>>>>> KHz ~ 200000 KHz)
>>>>>>>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000
>>>>>>>> KHz ~ 100000 KHz)
>>>>>>>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus
>>>>>>>> (100000 KHz ~ 200000 KHz)
>>>>>>>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000
>>>>>>>> KHz ~ 267000 KHz)
>>>>>>>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000
>>>>>>>> KHz ~ 400000 KHz)
>>>>>>>> [    6.225748] exynos-bus: new bus device registered: bus-display
>>>>>>>> (160000 KHz ~ 200000 KHz)
>>>>>>>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000
>>>>>>>> KHz ~ 134000 KHz)
>>>>>>>>
>>>>>>>> This is definitely a driver bug, but so far it worked fine, so this is a
>>>>>>>> regression that need to be addressed somehow...
>>>>>>> Thanks for checking, but what is exactly the bug? The devices registered
>>>>>>> - just with different name.
>>>>>> The bug is that the board fails to boot from time to time, freezing
>>>>>> after registering PPMU counters...
>>>>> My U3 with and without this patch, reports several warnings:
>>>>> iommu_group_do_set_platform_dma()
>>>>> exynos_iommu_domain_free()
>>>>> clk_core_enable()
>>>>>
>>>>> and finally:
>>>>> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
>>>>>
>>>>> and keeps stalling.
>>>>>
>>>>> At least on next-20230203. Except all these (which anyway make board
>>>>> unbootable) look fine around PMU and exynos-bus.
>>>> I also booted few times my next/dt branch (with this patch) and no
>>>> problems. How reproducible is the issue you experience?
>>> IOMMU needs a fixup, that has been merged today:
>>>
>>> https://lore.kernel.org/all/20230123093102.12392-1-m.szyprowski@samsung.com/
>>>
>>> I was initially convinced that this freeze is somehow related to this
>>> IOMMU fixup, but it turned out that the devfreq is a source of the problems.
>>>
>>> The freeze happens here about 1 of 10 boots, usually with kernel
>>> compiled from multi_v7_defconfig, while loading the PPMU modules. It
>>> happens on your next/dt branch too.
>> I was able to reproduce it easily with multi_v7. Then I commented out
>> dmc bus which fixed the issue. Then I commented out acp and c2c buses
>> (children/passive) which also fixed the issue. Then I uncommented
>> everything and went back to next/dt - exactly the same as it was failing
>> - and since then I cannot reproduce it. I triple checked, but now my
>> multi_v7 on U3 on next/dt boots perfectly fine. Every time.
> 
> This issue still happens from time to time. I quick workaround to fix it 
> is to add:
> 
> MODULE_SOFTDEP("pre: exynos_ppmu");
> 
> to the exynos-bus driver. Is it acceptable solution?

I initially thought it might be caused by deferred probe, but it happens
even in successful boot. I guess we can go with this workaround because
I really do not have other idea.

Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi
index c02865ff0761..f34c7400475b 100644
--- a/arch/arm/boot/dts/exynos4412.dtsi
+++ b/arch/arm/boot/dts/exynos4412.dtsi
@@ -31,6 +31,134 @@  aliases {
 		mshc0 = &mshc_0;
 	};
 
+	bus_acp: bus-acp {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_DIV_ACP>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_acp_opp_table>;
+		status = "disabled";
+
+		bus_acp_opp_table: opp-table {
+			compatible = "operating-points-v2";
+
+			opp-100000000 {
+				opp-hz = /bits/ 64 <100000000>;
+			};
+			opp-134000000 {
+				opp-hz = /bits/ 64 <134000000>;
+			};
+			opp-160000000 {
+				opp-hz = /bits/ 64 <160000000>;
+			};
+			opp-267000000 {
+				opp-hz = /bits/ 64 <267000000>;
+			};
+		};
+	};
+
+	bus_c2c: bus-c2c {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_DIV_C2C>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_dmc_opp_table>;
+		status = "disabled";
+	};
+
+	bus_dmc: bus-dmc {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_DIV_DMC>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_dmc_opp_table>;
+		samsung,data-clock-ratio = <4>;
+		#interconnect-cells = <0>;
+		status = "disabled";
+	};
+
+	bus_display: bus-display {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_ACLK160>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_display_opp_table>;
+		interconnects = <&bus_leftbus &bus_dmc>;
+		#interconnect-cells = <0>;
+		status = "disabled";
+
+		bus_display_opp_table: opp-table {
+			compatible = "operating-points-v2";
+
+			opp-160000000 {
+				opp-hz = /bits/ 64 <160000000>;
+			};
+			opp-200000000 {
+				opp-hz = /bits/ 64 <200000000>;
+			};
+		};
+	};
+
+	bus_fsys: bus-fsys {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_ACLK133>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_fsys_opp_table>;
+		status = "disabled";
+
+		bus_fsys_opp_table: opp-table {
+			compatible = "operating-points-v2";
+
+			opp-100000000 {
+				opp-hz = /bits/ 64 <100000000>;
+			};
+			opp-134000000 {
+				opp-hz = /bits/ 64 <134000000>;
+			};
+		};
+	};
+
+	bus_leftbus: bus-leftbus {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_DIV_GDL>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_leftbus_opp_table>;
+		interconnects = <&bus_dmc>;
+		#interconnect-cells = <0>;
+		status = "disabled";
+	};
+
+	bus_mfc: bus-mfc {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_SCLK_MFC>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_leftbus_opp_table>;
+		status = "disabled";
+	};
+
+	bus_peri: bus-peri {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_ACLK100>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_peri_opp_table>;
+		status = "disabled";
+
+		bus_peri_opp_table: opp-table {
+			compatible = "operating-points-v2";
+
+			opp-50000000 {
+				opp-hz = /bits/ 64 <50000000>;
+			};
+			opp-100000000 {
+				opp-hz = /bits/ 64 <100000000>;
+			};
+		};
+	};
+
+	bus_rightbus: bus-rightbus {
+		compatible = "samsung,exynos-bus";
+		clocks = <&clock CLK_DIV_GDR>;
+		clock-names = "bus";
+		operating-points-v2 = <&bus_leftbus_opp_table>;
+		status = "disabled";
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -171,6 +299,53 @@  cpu0_opp_1500: opp-1500000000 {
 		};
 	};
 
+	bus_dmc_opp_table: opp-table-1 {
+		compatible = "operating-points-v2";
+
+		opp-100000000 {
+			opp-hz = /bits/ 64 <100000000>;
+			opp-microvolt = <900000>;
+		};
+		opp-134000000 {
+			opp-hz = /bits/ 64 <134000000>;
+			opp-microvolt = <900000>;
+		};
+		opp-160000000 {
+			opp-hz = /bits/ 64 <160000000>;
+			opp-microvolt = <900000>;
+		};
+		opp-267000000 {
+			opp-hz = /bits/ 64 <267000000>;
+			opp-microvolt = <950000>;
+		};
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			opp-microvolt = <1050000>;
+			opp-suspend;
+		};
+	};
+
+	bus_leftbus_opp_table: opp-table-2 {
+		compatible = "operating-points-v2";
+
+		opp-100000000 {
+			opp-hz = /bits/ 64 <100000000>;
+			opp-microvolt = <900000>;
+		};
+		opp-134000000 {
+			opp-hz = /bits/ 64 <134000000>;
+			opp-microvolt = <925000>;
+		};
+		opp-160000000 {
+			opp-hz = /bits/ 64 <160000000>;
+			opp-microvolt = <950000>;
+		};
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-microvolt = <1000000>;
+			opp-suspend;
+		};
+	};
 
 	soc: soc {
 
@@ -393,182 +568,6 @@  sysmmu_fimc_lite1: sysmmu@123c0000 {
 				 <&isp_clock CLK_ISP_FIMC_LITE1>;
 			#iommu-cells = <0>;
 		};
-
-		bus_dmc: bus-dmc {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_DIV_DMC>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_dmc_opp_table>;
-			samsung,data-clock-ratio = <4>;
-			#interconnect-cells = <0>;
-			status = "disabled";
-		};
-
-		bus_acp: bus-acp {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_DIV_ACP>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_acp_opp_table>;
-			status = "disabled";
-		};
-
-		bus_c2c: bus-c2c {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_DIV_C2C>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_dmc_opp_table>;
-			status = "disabled";
-		};
-
-		bus_dmc_opp_table: opp-table-1 {
-			compatible = "operating-points-v2";
-
-			opp-100000000 {
-				opp-hz = /bits/ 64 <100000000>;
-				opp-microvolt = <900000>;
-			};
-			opp-134000000 {
-				opp-hz = /bits/ 64 <134000000>;
-				opp-microvolt = <900000>;
-			};
-			opp-160000000 {
-				opp-hz = /bits/ 64 <160000000>;
-				opp-microvolt = <900000>;
-			};
-			opp-267000000 {
-				opp-hz = /bits/ 64 <267000000>;
-				opp-microvolt = <950000>;
-			};
-			opp-400000000 {
-				opp-hz = /bits/ 64 <400000000>;
-				opp-microvolt = <1050000>;
-				opp-suspend;
-			};
-		};
-
-		bus_acp_opp_table: opp-table-2 {
-			compatible = "operating-points-v2";
-
-			opp-100000000 {
-				opp-hz = /bits/ 64 <100000000>;
-			};
-			opp-134000000 {
-				opp-hz = /bits/ 64 <134000000>;
-			};
-			opp-160000000 {
-				opp-hz = /bits/ 64 <160000000>;
-			};
-			opp-267000000 {
-				opp-hz = /bits/ 64 <267000000>;
-			};
-		};
-
-		bus_leftbus: bus-leftbus {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_DIV_GDL>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_leftbus_opp_table>;
-			interconnects = <&bus_dmc>;
-			#interconnect-cells = <0>;
-			status = "disabled";
-		};
-
-		bus_rightbus: bus-rightbus {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_DIV_GDR>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_leftbus_opp_table>;
-			status = "disabled";
-		};
-
-		bus_display: bus-display {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_ACLK160>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_display_opp_table>;
-			interconnects = <&bus_leftbus &bus_dmc>;
-			#interconnect-cells = <0>;
-			status = "disabled";
-		};
-
-		bus_fsys: bus-fsys {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_ACLK133>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_fsys_opp_table>;
-			status = "disabled";
-		};
-
-		bus_peri: bus-peri {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_ACLK100>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_peri_opp_table>;
-			status = "disabled";
-		};
-
-		bus_mfc: bus-mfc {
-			compatible = "samsung,exynos-bus";
-			clocks = <&clock CLK_SCLK_MFC>;
-			clock-names = "bus";
-			operating-points-v2 = <&bus_leftbus_opp_table>;
-			status = "disabled";
-		};
-
-		bus_leftbus_opp_table: opp-table-3 {
-			compatible = "operating-points-v2";
-
-			opp-100000000 {
-				opp-hz = /bits/ 64 <100000000>;
-				opp-microvolt = <900000>;
-			};
-			opp-134000000 {
-				opp-hz = /bits/ 64 <134000000>;
-				opp-microvolt = <925000>;
-			};
-			opp-160000000 {
-				opp-hz = /bits/ 64 <160000000>;
-				opp-microvolt = <950000>;
-			};
-			opp-200000000 {
-				opp-hz = /bits/ 64 <200000000>;
-				opp-microvolt = <1000000>;
-				opp-suspend;
-			};
-		};
-
-		bus_display_opp_table: opp-table-4 {
-			compatible = "operating-points-v2";
-
-			opp-160000000 {
-				opp-hz = /bits/ 64 <160000000>;
-			};
-			opp-200000000 {
-				opp-hz = /bits/ 64 <200000000>;
-			};
-		};
-
-		bus_fsys_opp_table: opp-table-5 {
-			compatible = "operating-points-v2";
-
-			opp-100000000 {
-				opp-hz = /bits/ 64 <100000000>;
-			};
-			opp-134000000 {
-				opp-hz = /bits/ 64 <134000000>;
-			};
-		};
-
-		bus_peri_opp_table: opp-table-6 {
-			compatible = "operating-points-v2";
-
-			opp-50000000 {
-				opp-hz = /bits/ 64 <50000000>;
-			};
-			opp-100000000 {
-				opp-hz = /bits/ 64 <100000000>;
-			};
-		};
 	};
 };