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    SubjectRe: [PATCH 2/5 v11] arm: omap: usb: ehci and ohci hwmod structures for omap3
    On Fri, Sep 30, 2011 at 2:02 PM, Paul Walmsley <> wrote:
    > On Wed, 28 Sep 2011, Munegowda, Keshava wrote:
    >> Thanks paul,
    >> But In USB Host case, there is a challenge!
    >> I need both usbhost_48m_fck and usbhost_120m_fck to be turned on when
    >> I invoke pm_runtime_get_sync ; so there are couple of options to do this
    >> 1. use clk_get with hard coded  usbhost_120m_fck name in  usbhs driver
    >>        enable this clock after invoking pm_runtime_get_sync
    >> 2. add an additional flag in hwmod ; so that pm_runtime_get_sync will enable
    >>            main clock as well as optional clocks
    >> please comment on these two approaches..
    > Looks like you picked approach #1 which is fine with me.
    > Here's what I don't understand about how this clock is used, though.
    > According to the 34xx TRM vZR Section "High-Speed USB Host
    > Subsystem Clocks", this is only used to "clock EHCI controller internal
    > logic".  So if EHCI is not being used, it would seem to me that this clock
    > shouldn't be enabled?  But patch #5 seems to enable and disable it
    > unconditionally.  Am I missing something here?

    OK. are you suggesting that this clock should be enabled/disabled; only
    if atleast one port is selected for ehci?
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      Last update: 2011-09-30 11:39    [W:0.020 / U:8.936 seconds]
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