linux-kernel - Re: [PATCH 06/10] ARM: dts: Add MSHC0 dt node for eMMC device for exynos3250-artik5 module

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Message-id: <56E67319.1050502@samsung.com>
Date:	Mon, 14 Mar 2016 17:15:21 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>, kgene@...nel.org,
	s.nawrocki@...sung.com, tomasz.figa@...il.com
Cc:	jh80.chung@...sung.com, andi.shyti@...sung.com,
	inki.dae@...sung.com, sw0312.kim@...sung.com,
	pankaj.dubey@...sung.com, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 06/10] ARM: dts: Add MSHC0 dt node for eMMC device for
 exynos3250-artik5 module

On 2016년 03월 14일 15:57, Krzysztof Kozlowski wrote:
> On 14.03.2016 11:04, Chanwoo Choi wrote:
>> From: Jaehoon Chung <jh80.chung@...sung.com>
>>
>> This patch adds MSHC (Mobile Storage Host Controller) dt node for Exynos3250
>> SoC. MSHC is an interface between the system and the eMMC device.
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
>> Signed-off-by: Andi Shyti <andi.shyti@...sung.com>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>>  arch/arm/boot/dts/exynos3250-artik5.dtsi | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos3250-artik5.dtsi b/arch/arm/boot/dts/exynos3250-artik5.dtsi
>> index 97d0087efb9f..75b291c10cdc 100644
>> --- a/arch/arm/boot/dts/exynos3250-artik5.dtsi
>> +++ b/arch/arm/boot/dts/exynos3250-artik5.dtsi
>> @@ -277,6 +277,25 @@
>>  	};
>>  };
>>  
>> +&mshc_0 {
>> +	num-slots = <1>;
>> +	broken-cd;
>> +	non-removable;
> 
> Broken or non-removable, not both.

I'll remove the 'broken-cd' property.

> 
>> +	cap-mmc-highspeed;
>> +	desc-num = <4>;
>> +	card-detect-delay = <200>;
>> +	vmmc-supply = <&ldo11_reg>;
> 
> Isn't this vqmmc-supply?

I'll fix it as following by using ldo12_reg:
	vmmc-supply = <&ldo12_reg>;

> 
> BTW, both MMC0 regulators (ldo11, ldo12) are marked as always-on. Why
> they cannot be controlled by XMMC0CDN (just like on Rinato)?

I'll fix it like rinato board to handle the ldo11/ldo12 as following:
gpk0-2 is XMMC0CDN pin.

                       ldo11_reg: LDO11 {
-                               /* VDD_MMC */
+                               /* VDD74 ~ VDD75 */
                                regulator-name = "VLDO11_1.8V";
                                regulator-min-microvolt = <1800000>;
                                regulator-max-microvolt = <1800000>;
-                               regulator-always-on;
+                               samsung,ext-control-gpios = <&gpk0 2 GPIO_ACTIVE_HIGH>;
                        };

                        ldo12_reg: LDO12 {
@@ -177,7 +178,7 @@
                                regulator-name = "VLDO12_2.8V";
                                regulator-min-microvolt = <2800000>;
                                regulator-max-microvolt = <2800000>;
-                               regulator-always-on;
+                               samsung,ext-control-gpios = <&gpk0 2 GPIO_ACTIVE_HIGH>;
                        };

> 
> What is the benefit of making this patch separate from "Add
> exynos3250-artik5 dtsi file for ARTIK5 module"? Does the board boot
> properly without this patch?

OK. I'll merge it with 5/10 patch.

Best Regards,
Chanwoo Choi

[snip]