On Wed, 2016-02-03 at 10:58:24 +0100, Michal Simek wrote: > On 3.2.2016 09:31, Mason wrote: > > On 03/02/2016 08:20, Michal Simek wrote: > > > >> Hi, > >> > >> On 3.2.2016 03:33, Shawn Lin wrote: > >>> + Michal, Sören Brinkmann > >>> > >>> On 2016/2/2 17:49, Mason wrote: > >>>> Hello everyone, > >>>> > >>>> Documentation/devicetree/bindings/mmc/arasan,sdhci.txt states: > >>>> > >>>> Required Properties: > >>>> - compatible: Compatibility string. Must be 'arasan,sdhci-8.9a' or > >>>> 'arasan,sdhci-4.9a' or 'arasan,sdhci-5.1' > >>>> > >>>> What do 8.9a, 4.9a, and 5.1 refer to? > >>>> > >>> > >>> Good question. > >>> > >>> Michal told me that 8.9a and 4.9a came from Xilinx > >>> databook which define their available arasan controller to be version > >>> 4.9a and 8.9a. > >> > >> Our version is coming from here. > >> http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf > >> page 28 > >> > >> Datasheets from 2012 and 2010 doesn't look too recent and I expect that > >> Arasan did a lot of work from that time that's why I am not surprised > >> that you are not able to see that versions. > > > > Hello Michal, > > > > I'm even more confused. > > > > Arasan's 2010-02-19 data sheet is titled > > SD3.0 / SDIO3.0 / eMMC4.4 AHB Host Controller > > > > Page 28 of the Xilinx data sheet mentions > > SD2.0 / SDIO2.0 / MMC3.31 AHB Host Controller > > Version 8.9A_apr02nd_2010 > > > > It does not make sense that Arasan would support SD3.0 in February, > > then go back to SD 2.0 in April. > > > > I do note eMMC4.4 vs MMC3.31 => perhaps these are two *different* > > IP blocks? > > > > Do your data sheets come with revision history? > > I don't have datasheet for this IP in my hand that's why I can't check it. > But I can't see any problem with it. Our zynq SoC supports SD2.0 and it > was requirement at that time. Bugs can happen. Arasan fixed it and > create new version. > At the same time can have 3.0 versions but vendor is just decide not to > use it for whatever reason. > > That's why timing of features and versions can upgrade any time and > unfortunately bugs happen. We have several Arasan data sheets here. The document names are: "SD2.0 / SDIO2.0 / MMC3.31 AHB Userguide" and the revisions are 9.2a, 4.4a and 5.4a. I have the feeling that the document revisions have been mistaken as the IP revision. I cannot find any other indicator for the IP revision though. Does the IP have a way to discover its revision? Sören -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
