Hello Felipe, On 30/05/2016 08:58, Felipe Balbi wrote:
> Mason writes: > >> I'm working on a SoC which embeds an IP block from GDA Technologies >> labeled "Pravega USB3 SuperSpeed Controller" (data-sheet is v0.99r >> dated 2014-01-29). A cursory search returns: >> >> http://www.sourcing.co.jp/prod_ip.htm >> http://www.sourcing.co.jp/prod_ip/usb_host_pb.pdf >> >> In the compliance section, the data-sheet lists: >> >> - USB 3.0 Revision 1.0 and all associated ECNs >> - Inter-Chip Supplement to the USB Revision 3.0 Specification, Revision 1.02 >> - Backward compatible with USB2.0 Revision 2.0 and all associated ECNs >> - High Speed Inter Chip Specification, Rev 1.0 and associated ECNs >> - USB 2.0 Link Power Management Addendum and associated Erratas >> - xHCI specification version 1.0 (in host mode) >> >> My question is: should I be able to use the generic XHCI driver to >> drive this controller? > > yes, you should. BUT... is this controller dual-role? If it is, then > it'd be nice to support both roles. Dual-role means OTG? or just static host/device? AFAIU, my version of the controller only supports host-mode. >> (The Makefile builds xhci-plat-hcd.o but I don't see xhci-plat-hcd.c >> Is it a generated file?) > > The makefile is smart enough to figure it out. Don't worry. Kernel's > build system knows that it needs xhci-plat-hcd.c in order to build > xhci-plat-hcd.o Oh, I wasn't worried. I was curious how/where that file is generated. >> One more thing: AFAIU, the USB PHY is made by Synopsys. >> Do I need a driver for that too? (I should examine 7b8ef22ea547) > > IIRC there are no registers to be configured on Synopsys PHY, so no. I looked more closely at the SoC documentation, which lists registers such as 0x0 CONFIG 0x4 CONTROL 0x8 TEST 0xC STATUS 0x10 CLK_RST_0 0x14 CLK_RST_1 0x18 PARAM_0 0x1C PARAM_1 0x20 PARAM_2 0x80 SNPS_CR_ADD 0x84 SNPS_CR_DATA 0xC0 RESET_CTRL For example, PARAM_1 contains a field "TX De-emphasis at 6 dB". That's PHY stuff, right? Are registers such as PHY_TIMER_REGISTER or LTSSM_* standard in USB3/XHCI, or is that PHY stuff too? Regards. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
