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Date: Tue, 15 Mar 2016 10:46:49 +0900 From: Chanwoo Choi <cw00.choi@...sung.com> To: Jaehoon Chung <jh80.chung@...sung.com>, Krzysztof Kozlowski <k.kozlowski@...sung.com>, kgene@...nel.org, s.nawrocki@...sung.com, tomasz.figa@...il.com Cc: 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 2016년 03월 15일 10:45, Chanwoo Choi wrote: > On 2016년 03월 15일 09:56, Jaehoon Chung wrote: >> On 03/15/2016 09:25 AM, Krzysztof Kozlowski wrote: >>> 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). > > ARTIK5 schema document VLDO18 and VLDO3 are connected to DVDD_MMC2_AP. > But, I'm not sure what is meaning. So, I'll drop the 'vmmc-supply' VLDO18 is not connected to DVDD_MMC2_AP. It is NC state. Sorry for confusion. Best Regards, Chanwoo Choi [snip]
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