On Tue, Aug 27, 2013 at 6:31 PM, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote: > Hi Yuvaraj, > > On Tuesday 27 of August 2013 17:32:52 Yuvaraj Kumar wrote: >> On Tue, Aug 27, 2013 at 4:31 PM, Mark Rutland <mark.rutland@xxxxxxx> > wrote: >> > On Tue, Aug 27, 2013 at 10:22:31AM +0100, Yuvaraj Kumar C D wrote: >> >> This patch adds the device tree node entries for exynos5420 SOC. >> >> Exynos5420 has a different version of DWMMC controller,so a new >> >> compatible string is used to distinguish it from the prior SOC's. >> >> >> >> This patch depends on >> >> >> >> mmc: dw_mmc: exynos: Add a new compatible string for exynos5420 >> >> >> >> changes since V3: >> >> 1.change fifo-depth size from 0x80 to 0x40 >> >> 2.Move the below properties >> >> >> >> a.card-detect-delay >> >> b.samsung,dw-mshc-ciu-div >> >> c.samsung,dw-mshc-sdr-timing >> >> d.samsung,dw-mshc-ddr-timing >> >> >> >> from SOC dts to board dts file as suggested by Doug Anderson >> >> >> >> changes since V2: >> >> 1.dropped num-slots property from node as its not required >> >> >> >> if number of card slots available is 1. >> >> >> >> 2.Move the below properties >> >> >> >> a.fifo-depth >> >> b.card-detect-delay >> >> c.samsung,dw-mshc-ciu-div >> >> d.samsung,dw-mshc-sdr-timing >> >> e.samsung,dw-mshc-ddr-timing >> >> >> >> from board dts to SOC dts,as these are not board specific >> >> properties. >> >> >> >> 3.Updated the binding document exynos-dw-mshc.txt. >> >> >> >> changes since V1: >> >> 1.disable node by status = disabled in SOC file >> >> 2.enable node by status = okay in board specific file >> >> >> >> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx> >> >> --- >> >> >> >> .../devicetree/bindings/mmc/exynos-dw-mshc.txt | 4 ++ >> >> arch/arm/boot/dts/exynos5420-smdk5420.dts | 34 >> >> +++++++++++++++++ arch/arm/boot/dts/exynos5420.dtsi >> >> | 39 ++++++++++++++++++++ 3 files changed, 77 insertions(+) >> >> >> >> diff --git a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt >> >> b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt index >> >> 6d1c098..25368e8 100644 >> >> --- a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt >> >> +++ b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt >> >> >> >> @@ -16,6 +16,8 @@ Required Properties: >> >> specific extensions. >> >> >> >> - "samsung,exynos5250-dw-mshc": for controllers with Samsung >> >> Exynos5250 >> >> >> >> specific extensions. >> >> >> >> + - "samsung,exynos5420-dw-mshc": for controllers with Samsung >> >> Exynos5420 + specific extensions. >> >> >> >> * samsung,dw-mshc-ciu-div: Specifies the divider value for the card >> >> interface>> >> >> unit (ciu) clock. This property is applicable only for Exynos5 >> >> SoC's and >> >> >> >> @@ -31,6 +33,8 @@ Required Properties: >> >> data rate mode operation. Refer notes below for the order of the >> >> cells and the valid values. >> >> >> >> +* bypass-smu: Bypass Security Management Unit of eMMC channel 0 and >> >> channel 1. + >> > >> > Could you elaborate on why this is needed? >> >> Exynos5420 Mobile Storage Host controller has a Security Management >> Unit (SMU) for >> channel 0 and channel 1 (mainly for eMMC). This binding property >> requires to add a quirk >> to bypass SMU as it is not being used yet. > > This looks like a configuration property, not hardware description to me > then. If presence of SMU depends on particular channel, then either the > property should be "snps,has-smu" or something like this, to indicate that > particular channel supports it and it's up to the driver how to handle this > feature. > >> > Is the SMU broken or not present in some hardware revisions? >> >> SMU is only present in channel 0 and channel 1,but not in channel 2.So >> to distinguish this, >> bypass-smu property has been added as quirks in the channel. > > Also a good question is what you mean with "channel". Is it the whole mshc > entity having compatible property or its subnodes aka slots? Its with the whole MSHC entity. > > If it's the former and channel 2 does not have SMU, making it compatible > with "samsung,exynos5250-dw-mshc", then it should be marked as such. In > this case the ideal solution would be to determine the SMU quirk only by > compatible value. Good one.I tried this,works perfect.Will repost the patch soon. > > Best regards, > Tomasz > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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