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    Subject[PATCH v2 0/4] Restore ULPI USB on Tegra20
    Date
    Hello,

    This series of patches fixes ULPI USB on Tegra20. The original problem
    was reported by Marcel Ziswiler, he found that "ulpi-link" clock was
    incorrectly set to CDEV2 instead of PLL_P_OUT4. Marcel made a patch
    that changed the "ulpi-link" clock to PLL_P_OUT4 and that fixed issue
    with the USB for the devices that have CDEV2 being enabled by bootloader.
    The patch got into the kernel and later Marc Dietrich found that USB
    stopped working on the "paz00" Tegra20 board. After a bit of discussion
    was revealed that PLL_P_OUT4 is the parent clock of the CDEV2 and clock
    driver was setting CDEV2's parent incorrectly. The parent clock is actually
    determined by the pinmuxing config of CDEV2 pingroup. This patchset fixes
    the parent of CDEV2 clock by making Tegra's pinctrl driver a clock provider,
    providing CDEV1/2 clock muxes (thanks to Peter De Schrijver for the
    suggestion), and then setting these clock muxes as parents for the CDEV1/2
    clocks. In the end Marcel's CDEV2->PLL_P_OUT4 change is reverted since CDEV2
    (aka MCLK2) is the actual clock source for "ulpi-link".

    Changelog:

    v2:
    - Added new patch "Add quirk for getting CDEV1/2 clocks", assuring
    that clk user won't get CDEV1/2 clocks until parent clk muxes
    are available, i.e. resolves potential issue with CDEV-user driver
    vs pinctrl driver probe order.

    - Factored out "pinctrl" patch from the patchset as was requested by
    Linus Walleij.

    - Addressed v1 review comments: fixed swapped DEV1/2 clk div bits,
    made DEV1/2 divs read-only, etc minor changes.

    Dmitry Osipenko (4):
    clk: tegra20: Add DEV1/DEV2 OSC dividers
    clk: tegra20: Correct parents of CDEV1/2 clocks
    clk: tegra: Add quirk for getting CDEV1/2 clocks
    ARM: dts: tegra20: Revert "Fix ULPI regression on Tegra20"

    arch/arm/boot/dts/tegra20.dtsi | 2 +-
    drivers/clk/tegra/clk-tegra20.c | 20 +++++++++++++++----
    drivers/clk/tegra/clk.c | 34 ++++++++++++++++++++++++++++++++-
    3 files changed, 50 insertions(+), 6 deletions(-)

    --
    2.17.0

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