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Date: Tue, 15 Mar 2016 09:25:31 +0900 From: Krzysztof Kozlowski <k.kozlowski@...sung.com> To: Chanwoo Choi <cw00.choi@...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 09/10] ARM: dts: Add MSHC2 dt node for SD card for exynos3250-artik5-devel board On 14.03.2016 19:22, Chanwoo Choi wrote: > On 2016년 03월 14일 18:44, Krzysztof Kozlowski wrote: >> On 14.03.2016 17:48, Chanwoo Choi wrote: >>> On 2016년 03월 14일 17:31, 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 SD card >>>>> >>>>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com> >>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com> >>>>> --- >>>>> arch/arm/boot/dts/exynos3250-artik5-devel.dts | 16 ++++++++++++++++ >>>>> 1 file changed, 16 insertions(+) >>>>> >>>>> diff --git a/arch/arm/boot/dts/exynos3250-artik5-devel.dts b/arch/arm/boot/dts/exynos3250-artik5-devel.dts >>>>> index d17c28969118..a371baf8536d 100644 >>>>> --- a/arch/arm/boot/dts/exynos3250-artik5-devel.dts >>>>> +++ b/arch/arm/boot/dts/exynos3250-artik5-devel.dts >>>>> @@ -21,6 +21,22 @@ >>>>> "samsung,exynos3250", "samsung,exynos3"; >>>>> }; >>>>> >>>>> +&mshc_2 { >>>>> + num-slots = <1>; >>>>> + cap-sd-highspeed; >>>>> + disable-wp; >>>>> + card-detect-delay = <200>; >>>>> + clock-frequency = <100000000>; >>>>> + clock-freq-min-max = <400000 100000000>; >>>>> + samsung,dw-mshc-ciu-div = <1>; >>>>> + samsung,dw-mshc-sdr-timing = <0 1>; >>>>> + samsung,dw-mshc-ddr-timing = <1 2>; >>>>> + pinctrl-names = "default"; >>>>> + pinctrl-0 = <&sd2_cmd &sd2_clk &sd2_cd &sd2_bus1 &sd2_bus4>; >>>>> + bus-width = <4>; >>>>> + status = "okay"; >>>> >>>> vqmmc-supply = ldo3? >>> >>> ldo3 is always on state because ldo3 is used for various IP in exynos3250. >>> I think that we had better to remain always on state for ldo3. >> >> Yes, I wasn't thinking about toggling ldo3 but about taking the >> regulator here to model the dependencies between components. > > Okay. I'll add it as following: > > vmmc-supply = <&ldo18_reg>; > vqmmc-supply = <&ldo3>; ldo18 is not used by mshc2. At least my schematics show that LDO3 goes to DVDD_MMC2 (on different board revision that would be ldo18 instead of ldo3, but not both). The card itself is powered by VDDFLASH_28/MAIN_BAT. BR, Krzysztof
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