linux-kernel - Re: [PATCH v7 11/13] ARM: dts: exynos: add syscon to clock compatible

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Date:   Wed, 8 May 2019 15:13:04 +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-pm@...r.kernel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, kgene@...nel.org,
        Chanwoo Choi <cw00.choi@...sung.com>,
        kyungmin.park@...sung.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        s.nawrocki@...sung.com, myungjoo.ham@...sung.com,
        keescook@...omium.org, tony@...mide.com, jroedel@...e.de,
        treding@...dia.com, digetx@...il.com, willy.mh.wolff.ml@...il.com
Subject: Re: [PATCH v7 11/13] ARM: dts: exynos: add syscon to clock
 compatible


On 5/8/19 12:17 PM, Krzysztof Kozlowski wrote:
> On Wed, 8 May 2019 at 11:50, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>>
>>
>> On 5/8/19 9:22 AM, Krzysztof Kozlowski wrote:
>>> On Mon, 6 May 2019 at 17:12, Lukasz Luba <l.luba@...tner.samsung.com> wrote:
>>>>
>>>> In order get the clock by phandle and use it with regmap it needs to be
>>>> compatible with syscon. The DMC driver uses two registers from clock
>>>> register set and needs the regmap of them.
>>>>
>>>> Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
>>>> ---
>>>>    arch/arm/boot/dts/exynos5800.dtsi | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/exynos5800.dtsi b/arch/arm/boot/dts/exynos5800.dtsi
>>>> index 57d3b31..0a2b328 100644
>>>> --- a/arch/arm/boot/dts/exynos5800.dtsi
>>>> +++ b/arch/arm/boot/dts/exynos5800.dtsi
>>>> @@ -17,7 +17,7 @@
>>>>    };
>>>>
>>>>    &clock {
>>>> -       compatible = "samsung,exynos5800-clock";
>>>> +       compatible = "samsung,exynos5800-clock", "syscon";
>>>
>>> What about Exynos5420 DTSI?
>> OK, I will also add it to 5420 dtsi.
>> --------------------------8<------------------------------------------
>> diff --git a/arch/arm/boot/dts/exynos5420.dtsi
>> b/arch/arm/boot/dts/exynos5420.dtsi
>> index aaff158..d9203f0 100644
>> --- a/arch/arm/boot/dts/exynos5420.dtsi
>> +++ b/arch/arm/boot/dts/exynos5420.dtsi
>> @@ -173,7 +173,7 @@
>>                   };
>>
>>                   clock: clock-controller@...10000 {
>> -                       compatible = "samsung,exynos5420-clock";
>> +                       compatible = "samsung,exynos5420-clock", "syscon";
>>                           reg = <0x10010000 0x30000>;
>>                           #clock-cells = <1>;
>>                   };
>> diff --git a/arch/arm/boot/dts/exynos5800.dtsi
>> b/arch/arm/boot/dts/exynos5800.dtsi
>> index 57d3b31..0a2b328 100644
>> --- a/arch/arm/boot/dts/exynos5800.dtsi
>> +++ b/arch/arm/boot/dts/exynos5800.dtsi
>> @@ -17,7 +17,7 @@
>>    };
>>
>>    &clock {
>> -       compatible = "samsung,exynos5800-clock";
>> +       compatible = "samsung,exynos5800-clock", "syscon";
>>    };
>> ----------------------------->8-----------------------------------
>>
>> Can I add your ack after that?
> 
> No need for ack. The DTS have to go through arm-soc so I will pick it
> up when dependencies get in and bindings are accepted (acked or
> applied). We have now merge window so I guess this will go to v5.4-rc1
> at earliest.
> 
> If you want to speed up things in future, be sure that dependencies
> (headers) are applied as early as possible.
Thank you Krzysztof for the explanation, good to know that.

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