Re: [PATCH 0/2] usb: cdns3: USBSSP platform driver support

[Peter Chen <peter.chen@cixtech.com>]

On 26-03-03 07:34:54, Pawel Laszczak wrote:
> [Some people who received this message don't often get email from pawell@cadence.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> EXTERNAL EMAIL
> 
> >
> >Hi Pawel,
> >
> >The Cadence USBSSP (CDNSP) controller was previously only accessible
> >through PCI, coupling the gadget driver with the PCI glue layer into a single
> >monolithic module (cdnsp-udc-pci). This prevented using the CDNSP IP on
> >SoC/platform designs that expose the controller through device tree, eg, CIX
> >Sky1 SoC.
> >
> >In this series, it restructures the driver to decouple the CDNSP gadget from
> >PCI, and refactor cdnsp-pci.c into a thin PCI-to-platform wrapper (similar to
> >cdns3-pci-wrap.c) that registers a platform device and passes PCI resources
> >and platform data to the common platform driver. So, please help test it in
> >your platform.
> >
> >The changes are tested with random configuration combination tests.
> >
> >============================================================
> >ALL TESTS COMPLETE. Summary:
> >============================================================
> >Starting cdns3 config combination tests...
> >Timestamp: 2026年 03月 02日 星期一 09:34:47 CST
> >
> >PASS: all-builtin (SUPPORT=y CDNS3=y GADGET=y HOST=y CDNSP=y
> >CDNSP_G=y CDNSP_H=y)
> >PASS: support-y_cdns3-m_gadget-y (SUPPORT=y CDNS3=m GADGET=y
> >HOST=y CDNSP=y CDNSP_G=y CDNSP_H=y)
> >PASS: support-y_cdns3-m_gadget-n (SUPPORT=y CDNS3=m GADGET=n
> >HOST=y CDNSP=y CDNSP_G=y CDNSP_H=y)
> >PASS: support-y_cdnsp-m_gadget-y (SUPPORT=y CDNS3=y GADGET=y HOST=y
> >CDNSP=m CDNSP_G=y CDNSP_H=y)
> >PASS: all-module (SUPPORT=m CDNS3=m GADGET=y HOST=y CDNSP=m
> >CDNSP_G=y CDNSP_H=y)
> >PASS: no-cdns3 (SUPPORT=y CDNS3=n GADGET=n HOST=n CDNSP=y
> >CDNSP_G=y CDNSP_H=y)
> >PASS: no-gadget (SUPPORT=y CDNS3=y GADGET=n HOST=y CDNSP=y
> >CDNSP_G=n CDNSP_H=y)
> >PASS: support-y_both-m_gadget-y (SUPPORT=y CDNS3=m GADGET=y HOST=y
> >CDNSP=m CDNSP_G=y CDNSP_H=y)
> >PASS: minimal-module (SUPPORT=m CDNS3=m GADGET=n HOST=n CDNSP=m
> >CDNSP_G=n CDNSP_H=n)
> >
> >This patch was developed with assistance from Anthropic Claude Opus 4.6.
> >
> 
> I can compile the kernel but when I try to install modules with
> make modules_install I get error:
> 
> DEPMOD  /lib/modules/7.0.0-rc1-new-pci-plat-support-next-20260227+
> depmod: ERROR: Cycle detected: cdns_usb_common -> cdnsp -> cdns_usb_common
> depmod: ERROR: Cycle detected: udc_core
> depmod: ERROR: Found 2 modules in dependency cycles!
> make[2]: *** [scripts/Makefile.modinst:132: depmod] Error 1
> 
> It occurs even with minimal configuration:
> CONFIG_USB_CDNS_SUPPORT=m
> # CONFIG_USB_CDNS3 is not set
> CONFIG_USB_CDNSP=m
> CONFIG_USB_CDNSP_GADGET=y
> 

Thanks for testing. It needs to let cdns3(p) platform driver as
standalone module to fix it. Would you please try below fix on top
of my patch set:

diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index 0e9b20e799d0..63484f145bb9 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -3,12 +3,14 @@
 CFLAGS_cdns3-trace.o				:= -I$(src)
 CFLAGS_cdnsp-trace.o				:= -I$(src)
 
-cdns-usb-common-y				:= core.o drd.o cdns3-plat.o
+cdns-usb-common-y				:= core.o drd.o
 
 ifeq ($(CONFIG_USB),m)
 obj-m						+= cdns-usb-common.o
+obj-m						+= cdns3-plat.o
 else
 obj-$(CONFIG_USB_CDNS_SUPPORT)			+= cdns-usb-common.o
+obj-$(CONFIG_USB_CDNS_SUPPORT)			+= cdns3-plat.o
 endif
 
 cdns-usb-common-$(CONFIG_USB_CDNS_HOST) 	+= host.o

Besides, would you please comment [1], the key point is could we
keep one platform driver with one compatible string, and cdns3 or cdnsp
platform is decided at runtime?

[1] https://www.spinics.net/lists/kernel/msg6072480.html

-- 

Best regards,
Peter