[RFC] usb issue on imx27: 3 clocks are needed

Philippe Reynes tremyfr at gmail.com
Sat Aug 16 08:38:30 PDT 2014

Hi all,

i.MX27's usb needs three clocks (usb_ipg_gate, usb_ahb_gate and usb_div)
but the current chipidea driver implementation, and devicetree, provides
only ipg and ahb. Consequently, if the bootloader don't enable the last
one, the kernel will crash.

Our approach/idea is to add a second, optionnal, clock in ci_hdrc_imx.c
with 'per' name in devicetree  and to add  clock name 'main_clk' for mandatory clock.
This approach it correct? Or an other approach seems better?
Thank you very much for your point of view.

Philippe and Gwenhael

More information about the linux-arm-kernel mailing list