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Subject: Re: [PATCH v1 26/50] ARM: dts: exynos: align NOC100 bus OPPs in
 Exynos5420
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
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        Marek Szyprowski <m.szyprowski@samsung.com>,
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From:   Lukasz Luba <l.luba@partner.samsung.com>
Message-ID: <8ed83c77-57f7-78a4-e437-714cfc7b5c58@partner.samsung.com>
Date:   Wed, 17 Jul 2019 12:27:38 +0200
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On 7/17/19 12:10 PM, Krzysztof Kozlowski wrote:
> On Mon, 15 Jul 2019 at 14:44, Lukasz Luba <l.luba@partner.samsung.com> wrote:
>>
>> The NOC100 has a parent which clock rate is set tot 400MHz. The OPPs which
>> are not possible to set are removed and new one is added.
> 
> I think it is just NOC bus... or are there more of such and this is 100 MHz one?
Yes, there is a bus NOC100 with a dedicated clock tree in the HW (with
3 muxes and one divider), which makes possible to take different PLL as
a source then WCORE have, divide the rate from it and even switch for a
while to alternative stable PLL (on the 2nd mux to SPLL (after a
divider)) to wait for main PLL rate change stability delay. Max rate is
limited to 100MHz for this NOC100 bus.

Regards,
Lukasz
> 
> Best regards,
> Krzysztof
> 
>