linux-kernel - Re: [PATCH] ARM: dts: use vqmmc-supply of emmc/sd for exynos4412-odroid-common

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Date:	Fri, 28 Aug 2015 18:10:16 +0200
From:	Tobias Jakobi <liquid.acid@....net>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-samsung-soc@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Kukjin Kim <kgene@...nel.org>
Subject: Re: [PATCH] ARM: dts: use vqmmc-supply of emmc/sd for
 exynos4412-odroid-common

Hello,

Krzysztof Kozlowski wrote:
> On 28.08.2015 10:48, Jaehoon Chung wrote:
>> On 08/27/2015 09:26 PM, Krzysztof Kozlowski wrote:
>>> W dniu 27.08.2015 o 18:29, Jaehoon Chung pisze:
>>>> Currently vmmc's property is wrong.
>>>> If it needs to control two supplies, then it has to use vmmc/vqmmc-supply.
>>>> (Card supply power and I/O Line supply Power.)
>>>>
>>>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
>>>> ---
>>>>  arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 7 ++++---
>>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>>>> index ca7d168..4ddabfd 100644
>>>> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>>>> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>>>> @@ -461,10 +461,10 @@
>>>>  &mshc_0 {
>>>>  	pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
>>>>  	pinctrl-names = "default";
>>>> -	vmmc-supply = <&ldo20_reg &buck8_reg>;
>>>> +	vmmc-supply = <&ldo20_reg>;
>>>> +	vqmmc-supply = <&buck8_reg>;
>>>
>>> Shouldn't this be reversed? LDO20 has 1.8V and it goes to MMC connector,
>>> so it should be VQMMC?
>>
>> If my schematics is right thing, buck8 is used LAN card power.
>> I will send after removing buck8_reg. how about?
>> Anyway, Thanks for pointing out. :)
> 
> Removing this regulator from this node would effectively disable it.
> That could affect other components like LAN.
> 
> Anyway before fixing the order I would prefer to find the right
> regulators used by MSHC node.
Please see this commit:
https://github.com/tobiasjakobi/linux-odroid/commit/113ffb92e0c7f58f15fe60b47d13eb2d65956d10

This was derived from private communication with Hardkernel.

I can't vouch for correctness though.

With best wishes,
Tobias



> Best regards,
> Krzysztof
> 
>>
>> I don't know who this regulator applied. I have guessed that it used for eMMC.
>> Sorry for guessing.
>>
>> Best Regards,
>> Jaehoon Chung
>>
>>>
>>> In the same time I can't find on schematics where BUCK8 goes...
>>>
>>> The SDHCI_2 node below looks good.
>>>
>>> Best regards,
>>> Krzysztof
>>>
>>>>  	mmc-pwrseq = <&emmc_pwrseq>;
>>>>  	status = "okay";
>>>> -
>>>>  	num-slots = <1>;
>>>>  	broken-cd;
>>>>  	card-detect-delay = <200>;
>>>> @@ -485,7 +485,8 @@
>>>>  	bus-width = <4>;
>>>>  	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus4>;
>>>>  	pinctrl-names = "default";
>>>> -	vmmc-supply = <&ldo4_reg &ldo21_reg>;
>>>> +	vmmc-supply = <&ldo21_reg>;
>>>> +	vqmmc-supply = <&ldo4_reg>;
>>>>  	cd-gpios = <&gpk2 2 0>;
>>>>  	cd-inverted;
>>>>  	status = "okay";
>>>>
>>>
>>>
>>>
>>
>>
> 
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