usb: phy: samsung: Introducing usb phy driver for samsung SoCs

Changes from v8:
Resending this patch series after rebasing to the latest usb-next branch. Rewording inline comments for better readability. Removed IS_ENABLED(CONFIG_OF) as pdev->dev.of_node is enough to check for dt support. Using of_match_ptr to add of_match_table to platform_driver structure. Removed unnecessary variables.

Changes from v7:
Rebased to the latest usb-next branch. Separating arch patches from these driver patches.

Changes from v6:
Modified register definitions according to the existing ones. Changed default PHY clk selection for SoCs. Improved binding text and rebased to the latest usb-next.

Changes from v5:
Moved clk_get() to driver's probe function. Now reference clock frequency selection value is stored in samsung_usbphy structure for later use. Used IS_ENABLED() instead of #ifdef in samsung_usbphy_get_driver_data().

Changes from v4:
Moved header file contents to driver's source file Removed unnecessary print message from driver's probe function Dropped the Free Software Foundation address from the header

Changes from v3:
Replaced susbsys_initcall()/module_exit() by module_platform_driver(). Accordingly in the hsotg driver returned -EPROBE_DEFER until phy driver is registered
Removed unnecessary devm_usb_put_phy() call from the hsotg driver remove.

Changes from v2:
Changed the driver filenames to samsung-usbphy
Rectified coding style related errors

Changes from v1:
Rebased patches to latest usb-next branch
Changed the name 'sec_usbphy' to 'samsung_usbphy'

This patch set introduces a phy driver for samsung SoCs. It uses the existing transceiver infrastructure to provide phy control functions. Use of this driver can be extended for usb host phy as well. Over the period of time all the phy related code for most of the samsung SoCs can be integrated here. Removing the existing phy code from mach-s3c64xx. Same can be done for other SoCs when they start supporting this phy driver.
This driver is tested with smdk6410 and Exynos4210(with DT).

Praveen Paneri (2):
usb: phy: samsung: Introducing usb phy driver for hsotg
usb: s3c-hsotg: Adding phy driver support

 .../devicetree/bindings/usb/samsung-usbphy.txt     |   11 +
 drivers/usb/gadget/s3c-hsotg.c                     |   37 ++-
 drivers/usb/phy/Kconfig                            |    8 +
 drivers/usb/phy/Makefile                           |    1 +
 drivers/usb/phy/samsung-usbphy.c                   |  354
++++++++++++++++++++ include/linux/platform_data/samsung-usbphy.h      
|   27 ++
 6 files changed, 428 insertions(+), 10 deletions(-)
 create mode 100644
Documentation/devicetree/bindings/usb/samsung-usbphy.txt create mode
100644 drivers/usb/phy/samsung-usbphy.c
 create mode 100644 include/linux/platform_data/samsung-usbphy.h

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