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 08:52:15 +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

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.

For exmaple: in board dts file including tmu dt

	&tmu {
		vtmu-supply = <&ldo7_reg>;
		status = "okay";
	};


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