The TX settings can be calibrated for particular hardware.  The
phy is reset by Linux, so this cannot be handled by the bootloader.

The TRM mentions that the maximum resistance should be used for the
DN/DP calibration in order to pass USB certification.

The values for the TX registers are poorly described in the TRM.
The meanings of the register values were taken from another
NXP-provided document:
https://community.nxp.com/message/566147#comment-566912

Acked-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jaret Cantu <jaret.cantu@timesys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Initialize vbus_value to be 0 since it's possible not to assign
any value before judgement.

Acked-by: Peter Chen <peter.chen@nxp.com
Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

Add "fsl,imx6ul-usbphy" compatible string for iMX6ul usb phy

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Replace redundant variable use in return statement.

Signed-off-by: Saurabh Karajgaonkar <skarajga@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Triggering suspend to RAM via sysfs on a i.MX28 causes a NULL pointer
dereference. This patch avoids the oops in mxs_phy_get_vbus_status()
by aborting since there is no syscon available.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: efdbd3a5d6e ("usb: phy: mxs: do not set PWD.RXPWD1PT1 for low speed connection")
CC: <stable@vger.kernel.org> # 4.0
Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

There is a request from IC engineer that if we doesn't
set phypwd as 0xffffffff, we need to delay about five
32Khz cycles before set phy's pwd register, otherwise,
the wakeup signal may can't wake up controller.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

At very rare cases, the SoF will not send out after resume with
low speed connection. The workaround is do not power down
PWD.RXPWD1PT1 bit during the suspend.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

For non-otg mode, we keep the usage of disconnect line between phy analog
and digital unchanging; for otg mode, at peripheral role, we keep the usage
unchanging too, at host role, the digital part needs to know dp/dm change
to respond device's data pulse when it is at low power mode.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

The RLT code has already done it, so no software operation is needed.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>