This went unnoticed in durin the merge window:
The dsps driver creates a child device for the musb core driver _and_
attaches the of_node to it so devm_usb_get_phy_by_phandle() grabs the
correct phy and attaches the devm resources to the proper device. We
could also use the parent device but then devm would attach the
resource to the wrong device and it would be destroyed once the parent
device is gone - not the device that is used by the musb core driver.

If the phy is now not available then dsps_musb_init() /
devm_usb_get_phy_by_phandle() returns with EPROBE_DEFER. Since the
of_node is attached it tries OF drivers as well and matches the driver
against DSPS. That one creates a new child device for the musb core
driver which gets probed immediately.

The whole thing repeats itself until the stack overflows.

I belive the same problem exists in ux500 glue code (since 313bdb11
("usb: musb: ux500: add device tree probing support") but the drivers are
now probed in the right order so they don't see it.

The problem is that the dsps driver gets bound to the musb-child device
due to the same of_node / matching binding. I don't really agree with
having yet another child node in DT to fix this. Ideally we would have
musb core driver with DT bindings and according to the binding we would
select the few extra hacks / gleue layer.

Therefore I suggest the driver to reject the musb-core device.

Cc: Lee Jones <lee.jones@linaro.org>
Tested-by: NTom Rini <trini@ti.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This is what I observe:
On the first connect, the musb starts with DEVCTL.Session set. On
disconnect, musb_core calls try_idle. That functions removes the Session
bit signalizing that the session is over (something that only in OTG is
required). A new device, that is plugged, is no longer recognized.
I've setup a timer and checked the DEVCTL register and I haven't seen a
change in VBus and I saw the B-Device bit set. After setting the IDDIG
into A mode and forcing the device to behave like a A device, I didn't
see a change.
Neither VBUS goes to 0b11 nor does a session start request comes.
In the TI-v3.2 kernel they skip to call musb_platform_try_idle() in the
OTG_STATE_A_WAIT_BCON state while not in OTG mode.
Since the second port hast a standard A plug the patch changes the port
to run in host mode only and skips the timer which would remove
DEVCTL.Session so we can reconnect to another device later.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Quite early on init there is an vbus / drvvbus interrupt comming and the
dsps code sets is_active to one. As a result we see a lot of

|musb_bus_suspend 2459: trying to suspend as a_wait_bcon while active

until a device is plugged in with pm_runtime enabled in the kernel.
After checking davinci, am35, da8xx I noticed that dsps is actually the
only one doing this.
So remove it and we won't flooded with mesages and the idle port can be
suspended.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This relfects the code and dts requires changes due to recent .dts
binding updates:
- use mg prefix for the Metor Graphics specific attributes
- use power in mA not in mA/2 as specifed in the USB2.0 specification
- remove the child node for USB. This is driver specific on won't be
  reflected in the device tree
- use the "mentor" prefix instead of "mg".
- use "dr_mode" istead of "mg,port-mode" for the port mode. The former
  is used by a few other drivers.

Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

devm_ioremap_resource returns an ERR_PTR value, not NULL, on failure.
Furthermore, the value returned by devm_ioremap_resource should be tested.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e,e1;
statement S;
@@

*e = devm_ioremap_resource(...);
if (!e1) S

// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This moves the two instances from the big node into two child nodes. The
glue layer ontop does almost nothing.

There is one devices containing the control module for USB (2) phy,
(2) usb and later the dma engine. The usb device is the "glue device"
which contains the musb device as a child. This is what we do ever since.

The new file musb_am335x is just here to prob the new bus and populate
child devices.

There are a lot of changes to the dsps file as a result of the changes:

- musb_core_offset
  This is gone. The device tree provides memory ressources information
  for the device there is no need to "fix" things

- instances
  This is gone as well. If we have two instances then we have have two
  child enabled nodes in the device tree. For instance the SoC in beagle
  bone has two USB instances but only one has been wired up so there is
  no need to load and init the second instance since it won't be used.

- dsps_glue is now per glue device
  In the past there was one of this structs but with an array of two and
  each instance accessed its variable depending on the platform device
  id.

- no unneeded copy of structs
  I do not know why struct dsps_musb_wrapper is copied but it is not
  necessary. The same goes for musb_hdrc_platform_data which allocated
  on demand and then again by platform_device_add_data(). One copy is
  enough.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

dsps uses a nop driver which is added in dsps itself and does the PHY
on/off calls within dsps. Since those calls are now moved the nop driver
itself, we can now request the phy proper phy and remove those calls.
Currently only the first musb interface is used so we only add one phy
node for now.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The "nop" driver isn't a do-nothing-stub but supports a couple functions
like clock on/off or is able to use a voltage regulator. This patch
simply renames the driver to "generic" since it is easy possible to
extend it by a simple function istead of writing a complete driver.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The EOI register is not present in the AM335x memory space according to
the TRM and thus removed.
Should any platform using the EOI register get merged then it may be
used again if the register address is not zero.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The ti81xx platform is not fully supported right now. This patch renames
the date structure to a am33xx prefix which is actually used.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

ti81xx does not have a baseport mainline i.e. it should not boot. The
amount of rework that is required makes it easier to simply remove that
platform (i.e. that possible platform device) and add it later once it
comes back with DT support.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

If the init / shutdown function of the phy moves out of dsps into the
phy driver, then dsps needs to call the callbacks of the phy driver to
ensure that this happens.
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Correct spelling typo in various part of drivers
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Fix to return -ENOMEM in the devm_kzalloc() error handling
case instead of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

The musb controller uses single bit defintion for both reset and
babble events. The babble event is valid only when controller is
active a-host, and hence print the babble message only when the
controller is active a-host.
Signed-off-by: NRavi Babu <ravibabu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

all other functions under drivers/usb/ start
with usb_, let's do the same thing.

This patch is in preparation for moving otg_state_string
to usb-common.c and deleting otg.c completely.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

if CONFIG_OF is disabled, np will be unused
and that will give us a compile warning. This
patch just avoids it.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

<linux/sizes.h> is the header defining SZ_4
and SZ_16M, we shouldn't depend on indirect
inclusion so let's explicitly include it.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

devm_ioremap_resource() provides its own error messages so all explicit
error messages can be removed from the failure code paths.
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Acked-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This patch let glue driver return -EPROBE_DEFER if the transceiver
is not readly, so we can support defer probe on musb to fix the
below error on 3.7-rc5 if transceiver drivers are built as module:

[   19.052490] unable to find transceiver of type USB2 PHY
[   19.072052] HS USB OTG: no transceiver configured
[   19.076995] musb-hdrc musb-hdrc.0.auto: musb_init_controller failed with status -19
[   19.089355] musb-hdrc: probe of musb-hdrc.0.auto rejects match -19
[   19.096771] driver: 'musb-omap2430': driver_bound: bound to device 'musb-omap2430'
[   19.105194] bus: 'platform': really_probe: bound device musb-omap2430 to driver musb-omap2430
[   19.174407] bus: 'platform': add driver twl4030_usb
[   19.179656] bus: 'platform': driver_probe_device: matched device twl4030_usb with driver twl4030_usb
[   19.202270] bus: 'platform': really_probe: probing driver twl4030_usb with device twl4030_usb
[   19.214172] twl4030_usb twl4030_usb: HW_CONDITIONS 0xc0/192; link 3
[   19.239624] musb-omap2430 musb-omap2430: musb core is not yet ready
[   19.246765] twl4030_usb twl4030_usb: Initialized TWL4030 USB module
[   19.254516] driver: 'twl4030_usb': driver_bound: bound to device 'twl4030_usb'
[   19.263580] bus: 'platform': really_probe: bound device twl4030_usb to driver twl4030_usb

Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: <stable@vger.kernel.org> v3.8
Signed-off-by: NMing Lei <ming.lei@canonical.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

linux/of.h was included twice.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

"54db6eee ARM: OMAP2+: Introduce local usb.h" moved control module bit
definitions from plat/usb.h (which dsps glue was using) to a local
header in mach-omap2. And in parallel,
"c68bb4c6 usb: musb: dsps: control module handling (quirk)" added
control module handling capability to dsps glue driver that used
those control module bit definitions.

Integration of above two changes would cause build error in musb dsps
glue driver (they go through different trees upstream) as is seen now
in linux-next. Fix it by adding necessary definitions in dsps glue
driver.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

CONFIG_HOTPLUG is going away as an option so __devexit is no
longer needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Cc: Peter Korsgaard <jacmet@sunsite.dk>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: NFelipe Balbi <balbi@ti.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

CONFIG_HOTPLUG is going away as an option so __devinitconst is no
longer needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Cc: Li Yang <leoli@freescale.com>
Acked-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Cc: Peter Korsgaard <jacmet@sunsite.dk>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: NFelipe Balbi <balbi@ti.com>
Cc: Li Yang <leoli@freescale.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Olav Kongas <ok@artecdesign.ee>
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Cc: Peter Korsgaard <jacmet@sunsite.dk>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: NFelipe Balbi <balbi@ti.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: NPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit d8c3ef25.

Above mentioned change was made along with multi usb phy change and
adding DT support for nop transceiver. But other two changes did not
make it to mainline. This in effect makes dsps musb wrapper unusable
even for single instance.

Hence revert it so that at least single instance can be supported.

Cc: stable@vger.kernel.org # v3.7
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Correct spelling typo in debug messages within drivers/usb.
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

am335x uses nop transceiver driver and need to enable builtin phy
by writing into usb_ctrl register available in system control
module register space. This is being added at musb glue driver
layer until a separate system control module driver is available.

Proper solution is to make use of control module driver, but it is
not expected to be ready soon.

Other options available are providing control module register space
as memory resource via DT or using omap hwmod.

DT approach has been rejected by Rob Herring, while resources are
being moved from hwmod to DT. And both of the above approaches
require that control module registers be configured in wrapper
itself requring a quirk in driver as well as DT or hwmod.

Here another option is used, providing driver with control module
register physical address. Even though this a hack, there is no other
option left till control module driver is ready. As of now only
am335x is using dsps wrapper, and so driver is made aware of am335x
control module physical address.

Please note that this is a temporary arrangment till omap control
module driver is available.

[afzal@ti.com: limit quirk to dsps wrapper]
Signed-off-by: NSanthapuri, Damodar <damodar.santhapuri@ti.com>
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NRavi Babu <ravibabu@ti.com>
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

dsps wrapper is now dt only. This requires that resources be obtained
using index and not name, modify accordingly.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Currently multiple phy's of the same type are not supported, hence
reduce musb instances to one. This helps in supporting at least one
instance of musb, rather than having none. Even without this, it was
observed that both instances were working (by luck), but this holds
good iff wrapper is part of Image. And it is not correct for both
controller's to be associated with same phy, here it was working
because phy is a nop one. And having wrapper as a module and
rmmod'ing would crash.

This can be reverted once multi phy support for same type is available
and driver is enhanced to make use of it.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

dsps wrapper is dt only, it cannot execute platform callbacks.
Presence of this would cause NULL dereference, hence remove it.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

This replaced the handcrafted id handling by the PLATFORM_DEVID_AUTO
value which should do the same thing.

This patch probably also fixes ux500 because I did not find the "musbid"
variable to remove. And we close a tiny-unlikely race window becuase the
old code gave the id back before device was destroyed in the remove
case.

[ balbi@ti.com : fixed up two failed hunks when applying patch ]

Cc: B, Ravi <ravibabu@ti.com>
Cc: Santhapuri, Damodar <damodar.santhapuri@ti.com>
Cc: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Cc: Bob Liu <lliubbo@gmail.com>
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

platform_device_unregister() only calls platform_device_del() and
platform_device_put(), thus use platform_device_unregister() to
simplify the code.

Also the documents in platform.c shows that platform_device_del
and platform_device_put must _only_ be externally called in error
cases.  All other usage is a bug.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

In order to make single zImage work for ARM architecture,
we need to make sure we don't depend on private headers.

Move USB platform_data to <linux/platform_data/omap-usb.h>
and add a minimal drivers/mfd/usb-omap.h.

Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Partha Basak <parthab@india.ti.com>
Cc: Keshava Munegowda <keshava_mgowda@ti.com>
Cc: linux-usb@vger.kernel.org
Signed-off-by: NFelipe Balbi <balbi@ti.com>
[tony@atomide.com: updated for local mfd/usb-omap.h]
Signed-off-by: NTony Lindgren <tony@atomide.com>

The res_name is used for the name construction of a DT property as
follows:

  sprintf(res_name, "port%d-mode", id);

Hence, res_name must be at least 11 characters long in order to store
the name including the terminating '\0'.

While at it, use to snprintf() rather than sprintf() when accessing this
buffer.
Reported-by: NDavid Binderman <dcb314@hotmail.com>
Signed-off-by: NDaniel Mack <zonque@gmail.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

As NOP device node is now added in am33xx tree so remove the call
which creates the NOP platform_device.
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NSanthapuri, Damodar <damodar.santhapuri@ti.com>
Signed-off-by: NRavi Babu <ravibabu@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

Added device tree support for dsps musb glue driver and updated the
Documentation with device tree binding information.
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NSanthapuri, Damodar <damodar.santhapuri@ti.com>
Signed-off-by: NRavi Babu <ravibabu@ti.com>
[afzal@ti.com: use '-' instead of '_' for dt properties]
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

AM335x and TI81xx platform has dual musb controller so updating the
musb_dspc.c to support the same.

Changes:
        - Moved otg_workaround timer to glue structure
        - Moved static local variable last_timer to glue structure
        - PHY on/off related cleanups
Signed-off-by: NRavi Babu <ravibabu@ti.com>
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NSanthapuri, Damodar <damodar.santhapuri@ti.com>
[afzal@ti.com: remove control module related modifications]
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>