linux-kernel - Re: [PATCH v1 26/50] ARM: dts: exynos: align NOC100 bus OPPs in Exynos5420

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Date:   Wed, 17 Jul 2019 12:41:32 +0200
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, linux-clk@...r.kernel.org,
        mturquette@...libre.com, sboyd@...nel.org,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, kgene@...nel.org, mark.rutland@....com,
        robh+dt@...nel.org, Chanwoo Choi <cw00.choi@...sung.com>,
        kyungmin.park@...sung.com, Andrzej Hajda <a.hajda@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH v1 26/50] ARM: dts: exynos: align NOC100 bus OPPs in
 Exynos5420



On 7/17/19 12:38 PM, Krzysztof Kozlowski wrote:
> On Wed, 17 Jul 2019 at 12:27, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>>
>>
>> On 7/17/19 12:10 PM, Krzysztof Kozlowski wrote:
>>> On Mon, 15 Jul 2019 at 14:44, Lukasz Luba <l.luba@...tner.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.
> 
> I think we misunderstood each other. I am saying, that the bus is
> called "NOC" in the DTSI. Not NOC100. So unless there are more of
> NOCs, stick to existing name NOC, even if it is not the most accurate.
OK, got it, thanks!

Lukasz
> 
> Best regards,
> Krzysztof
> 
>