linux-kernel - Re: [PATCH] ARM: dts: Add TMU dt node to monitor the temperature for Exynos3250

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Date:	Wed, 02 Jul 2014 13:27:55 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Sachin Kamat <spk.linux@...il.com>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: Add TMU dt node to monitor the temperature for
 Exynos3250

Hi Sachin,

On 07/02/2014 12:09 PM, Sachin Kamat wrote:
> On Wed, Jul 2, 2014 at 5:22 AM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>> On 07/01/2014 01:10 PM, Sachin Kamat wrote:
>>> Hi Chanwoo,
>>>
>>> On Tue, Jul 1, 2014 at 9:34 AM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>>>> Hi Sachin,
>>>>
>>>> On 07/01/2014 12:33 PM, Sachin Kamat wrote:
>>>>> Hi Chanwoo,
>>>>>
>>>>> On Tue, Jul 1, 2014 at 6:10 AM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>>>>>> This patch add TMU (Thermal Management Unit) dt node to monitor the high
>>>>>> temperature for Exynos3250.
>>>>>>
>>>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>>>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>>>>>> ---
>>>>>> This patch has a dependency on following patch [1]:
>>>>>>  [1] https://lkml.org/lkml/2014/6/30/805
>>>>>>
>>>>>>  arch/arm/boot/dts/exynos3250.dtsi | 10 ++++++++++
>>>>>>  1 file changed, 10 insertions(+)
>>>>>>
>>>>>> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
>>>>>> index 3660cab..1e566af 100644
>>>>>> --- a/arch/arm/boot/dts/exynos3250.dtsi
>>>>>> +++ b/arch/arm/boot/dts/exynos3250.dtsi
>>>>>> @@ -192,6 +192,16 @@
>>>>>>                         status = "disabled";
>>>>>>                 };
>>>>>>
>>>>>> +               tmu: tmu@...C0000 {
>>>>>> +                       compatible = "samsung,exynos3250-tmu";
>>>>>> +                       interrupt-parent = <&gic>;
>>>>>> +                       reg = <0x100C0000 0x100>;
>>>>>> +                       interrupts = <0 216 0>;
>>>>>> +                       clocks = <&cmu CLK_TMU_APBIF>;
>>>>>> +                       clock-names = "tmu_apbif";
>>>>>> +                       status = "disabled";
>>>>>
>>>>> I don't think there would be any board specific properties needed. Hence
>>>>> leave the status as enabled (by deleting the above line).
>>>>>
>>>>
>>>> I think that if specific board need TMU feature, dts file for specific board
>>>> should include tmu dt node with 'okay' status. The specific board based on
>>>> Exynos3250 might not need TMU feature.
>>>
>>> The status field in DT node is not meant for stating the build configuration but
>>> represents the readiness of the hardware for usage on the platform. If
>>> a particular
>>> board does not need this feature it needs to be disabled in the build
>>> config and only
>>> for any special requirements disable it in board file.
>>
>> TMU (Thermal Management Unit) needs specific regulator for TMU power as following:
>> The regulator for TMU is dependent on board.
> 
> In this case it makes sense to leave it disabled in dtsi.
> 

Thanks for your review.

Best Regards,
Chanwoo Choi
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