-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sergei Shtylyov wrote: > Hello. > > Yusuf Caglar AKYUZ wrote: >>> i'm trying to get an USB-stick running on a DVEVM-alike >>> hardware on a recent kernel, but the USB host appears >>> to be plain dead. >>> >>> I've digged a little into the kernel and my result is, that >>> 'platform_driver_probe' in the end of 'musb_init' never >>> ends calling 'musb_probe', thus resulting in the musb_driver >>> being deregistered and ignored by the kernel. >>> >>> Digging deeper, the 'platform_driver_probe' enumerates the >>> 'platform' bus but fails to find any suiting device. Thus, from >>> the sources, it appears as if the construction misses a >>> 'platform_device' representing the USB host controller. >>> >>> Because only the kernel and no hardware appears to be involved, >>> it looks like a silly kernel configuration problem to me. I write to >>> ask if someone knows the solution or could otherwise help. >>> >>> I can produce the result with 'davinci_evm_dm644x_defconfig'. >> You said DVEVM-alike, does it have i2c port expander as well for >> VBUS control? >> > > There's much more wisdom in controlling DRVVBUS via plain GPIO than > this horrible GPIO expander thing. >
Absolutely. In fact we're using GPIO in our own boards and: 1) DRVVBUS control must be board specific. 2) Simply passing GPIO with platform data is not enough because polarity may even change. 3) I guess we don't need a workqueue for direct GPIO control. What is the best way to achieve these goals? Passing a function pointer via platform data to handle pin control at board* files, or passing GPIO number and polarity via platform data while using workqueue for all the cases? Regards, Caglar -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAkm5hpEACgkQ/nL+S5dojehz1ACfSh9HtsgnZbMh7+DFzpMQBqyo gigAn0l5FFeFd3UPvowoxnutFasktYGA =VbWz -----END PGP SIGNATURE----- _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
