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Add a new PHY_COMMON_PROPS library that provides helper functions for
PHY drivers to read standardized polarity properties from the device
tree node:
- phy_get_rx_polarity() / phy_get_tx_polarity()
- phy_get_manual_rx_polarity() / phy_get_manual_tx_polarity()
The dt-bindings/phy/phy.h header with PHY_POL_NORMAL, PHY_POL_INVERT,
and PHY_POL_AUTO constants is provided via dts/upstream/include, which
is already in the build include path.
Ported from Merge tag 'phy-for-7.0':
git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy
Link: https://git.kernel.org/linus/e7556b59ba65179612bce3fa56bb53d1b4fb20db
Signed-off-by: Lucien.Jheng <lucienzx159@gmail.com>
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