linux-kernel - Re: [PATCH v3 1/5] arm64: dts: exynos5433: TM2/E: Fix wrong information of ldo23 and ldo25

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Message-id: <586F4554.6020206@samsung.com>
Date:   Fri, 06 Jan 2017 16:20:52 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Jaechul Lee <jcsing.lee@...sung.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Andi Shyti <andi.shyti@...sung.com>, beomho.seo@...sung.com,
        galaxyra@...il.com, linux-arm-kernel@...ts.infradead.org,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 1/5] arm64: dts: exynos5433: TM2/E: Fix wrong
 information of ldo23 and ldo25

On 2017년 01월 06일 16:05, Krzysztof Kozlowski wrote:
> On Fri, Jan 06, 2017 at 12:59:05PM +0900, Jaechul Lee wrote:
>> From: Chanwoo Choi <cw00.choi@...sung.com>
>>
>> This patch fixes the wrong information of ldo23 and ldo25 on both TM2 and TM2E.
> 
> Please describe what is exactly wrong and how it affects the
> system/user. This is going to the fixes so it needs a good explanation.

When I posted the patch[1], I refer to the old schematic document of both TM2 and TM2E.
[1] 01e5d2352152 ("arm64: dts: exynos: Add dts file for Exynos5433-based TM2 board")

After checking the highest version of schematic document of both TM2 and TM2E,
there is no difference of ldo23/ldo25 on both TM2 and TM2E.
- ldo23 is used on TM2/TM2E, but the name/max-microvolt are wrong. 
- ldo25 isn't used on TM2/TM2E. (not connected)

Because ldo23 and lod25 are not used on other device in Exynos5433 and TM2 board.
this patch does not affect the operation to system/user.

> 
>>
>> Fixes: 01e5d2352152 ("arm64: dts: exynos: Add dts file for Exynos5433-based TM2 board")
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Signed-off-by: Andi Shyti <andi.shyti@...sung.com>
>> Signed-off-by: Jaechul Lee <jcsing.lee@...sung.com>
>> ---
>>  arch/arm64/boot/dts/exynos/exynos5433-tm2.dts  |  7 ++++---
>>  arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts | 10 ----------
>>  2 files changed, 4 insertions(+), 13 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
>> index 3b5215c..e8971f4 100644
>> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts
>> @@ -504,9 +504,9 @@
>>  			};
>>  
>>  			ldo23_reg: LDO23 {
>> -				regulator-name = "CAM_SEN_CORE_1.2V_AP";
>> +				regulator-name = "CAM_SEN_CORE_1.05V_AP";
>>  				regulator-min-microvolt = <1050000>;
>> -				regulator-max-microvolt = <1200000>;
>> +				regulator-max-microvolt = <1050000>;
>>  			};
>>  
>>  			ldo24_reg: LDO24 {
>> @@ -516,9 +516,10 @@
>>  			};
>>  
>>  			ldo25_reg: LDO25 {
>> -				regulator-name = "CAM_SEN_A2.8V_AP";
>> +				regulator-name = "UNUSED_LDO25";
>>  				regulator-min-microvolt = <2800000>;
>>  				regulator-max-microvolt = <2800000>;
>> +				regulator-always-off;
> 
> Don't add it. See my other patch.

OK. After completing the kernel booting, the unused regulators will be off.

> 
> Best regards,
> Krzysztof
> 
>>  			};
>>  
>>  			ldo26_reg: LDO26 {
>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
>> index 1db4e7f..854c583 100644
>> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2e.dts
>> @@ -18,16 +18,6 @@
>>  	compatible = "samsung,tm2e", "samsung,exynos5433";
>>  };
>>  
>> -&ldo23_reg {
>> -	regulator-name = "CAM_SEN_CORE_1.025V_AP";
>> -	regulator-max-microvolt = <1050000>;
>> -};
>> -
>> -&ldo25_reg {
>> -	regulator-name = "UNUSED_LDO25";
>> -	regulator-always-off;
>> -};
>> -
>>  &ldo31_reg {
>>  	regulator-name = "TSP_VDD_1.8V_AP";
>>  	regulator-min-microvolt = <1800000>;
>> -- 
>> 2.7.4
>>
> 
> 
> 


-- 
Best Regards,
Chanwoo Choi
S/W Center, Samsung Electronics