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

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Date:	Wed, 2 Jul 2014 08:39:13 +0530
From:	Sachin Kamat <spk.linux@...il.com>
To:	Chanwoo Choi <cw00.choi@...sung.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

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.

-- 
Regards,
Sachin.
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