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Instead of allocating the smi_info structure, filling in the I/O
info, and passing it to ipmi_si_add_smi(), just pass the I/O
info in the io structure and let ipmi_si_add_smi() allocate
the smi_info structure.
This required redoing the way the remove functions for some
device interfaces worked, a new function named
ipmi_si_remove_by_dev() allows the device to be passed in and
detected instead of using driver data, which couldn't be
filled out easily othersize.
After this the platform handling should be decoupled from the
smi_info structure and that handling can be pulled out to its
own files.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
So the platform code can do it without having to access the
smi info, getting ready for pulling the platform handling
section to their own files.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
That's where it belongs, and we are getting ready for moving the
platform handling out of the main ipmi_si_intf.c file.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
A BMC's guid or device id info may change dynamically, this could
result in a different configuration that needs to be done. Adjust
the BMCs dynamically.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This is getting ready for the ability to redo the BMC if it's
information changes, we need a fallback mechanism.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Currently, it's up to the IPMI SMIs to provide the product & version
details of BMCs behind registered IPMI SMI interfaces. This device ID is
provided on SMI regsitration, and kept around for all future queries.
However, this version information isn't always static. For example, a
BMC may be upgraded at runtime, making the old version information
stale.
This change allows querying the BMC device ID & version information
dynamically. If no static device_id argument is provided to
ipmi_register_smi, then the IPMI core code will perform a Get Device ID
IPMI command to query the version information when needed. We keep a
short-term cache of this information so we don't need to re-query
for every attribute access.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
I basically rewrote this, I fixed some locking issues and simplified
things. Same functional change, though.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
There are a lot of bad things that a set of BMCs could do that
would really confuse the IPMI driver; it's possible for BMCs with
different GUIDs to have the same product/devid (though that's
not technically legal), which would result in platform device
namespace collisions. Fixing it would involve either using
the GUID in the BMC name, which resulted in huge names, or
just using an ida for numbering the BMCs. The latter approach
was chosen to avoid the huge names.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Currently, ipmi_demagle_device_id requires a full response buffer in its
data argument. This means we can't use it to parse a response in a
struct ipmi_recv_msg, which has the netfn and cmd as separate bytes.
This change alters the definition and users of ipmi_demangle_device_id
to use a split netfn, cmd and data buffer, so it can be used with
non-sequential responses.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Fixed the ipmi_ssif.c and ipmi_si_intf.c changes to use data from the
response, not the data from the message, when passing info to the
ipmi_demangle_device_id() function.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
In an upcoming change, we'll want to grab a reference to the ipmi_smi_t
from a struct bmc_device. This change adds a pointer to allow this.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Reworked to support multiple interfaces on a BMC.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This makes getting the device id consistent, and make it possible
to add a function to fetch it dynamically later.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
There was a certain error case where the BMC wouldn't be deregistered
like it should be. Rework the BMC registration to make calling
ipmi_bmc_unregister() ok even if it's not registered and to clean up
the error handling for ipmi_bmc_register().
Signed-off-by: Corey Minyard <cminyard@mvista.com>
The recent changes to add SMBIOS (DMI) IPMI interfaces as platform
devices caused DMI to be selected before ACPI, causing ACPI type
of operations to not work.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
BMC device refcounts were not being decremented after fetching from
driver_find_device(). Also, document the use of ipmidriver_mutex
and tighten it's span some by incrementing the BMC's usecount in
the BMC find routines and not later. This will be important for
future changes where a long mutex hold area will complicate things.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Make this const as it is only passed to a const argument of the function
ipmi_create_user.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
They were set by config items, but people complained that they were
never turned on. So have them always available and enabled by a
module parameter.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
The function ipmi_get_info_from_resources is local to the source and
does not need to be in global scope, so make it static. Add in
newline to function declaration to make it checkpatch warning clean.
Cleans up sparse warnings:
symbol 'ipmi_get_info_from_resources' was not declared. Should it
be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
When I set the timeout to a specific value such as 500ms, the timeout
event will not happen in time due to the overflow in function
check_msg_timeout:
...
ent->timeout -= timeout_period;
if (ent->timeout > 0)
return;
...
The type of timeout_period is long, but ent->timeout is unsigned long.
This patch makes the type consistent.
Reported-by: Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Weilong Chen <chenweilong@huawei.com>
Cc: <stable@vger.kernel.org> # 3.16.x
When ipmi is probed via ACPI, the boot log shows
[ 17.945139] ipmi_si IPI0001:00: probing via device tree
[ 17.950369] ipmi_si IPI0001:00: ipmi_si: probing via ACPI
[ 17.955795] ipmi_si IPI0001:00: [io 0x00e4-0x3fff] regsize 1 spacing 1 irq 0
[ 17.962932] ipmi_si: Adding ACPI-specified bt state machine
which "ipmi_si IPI0001:00: probing via device tree" is misleading
with a ACPI HID "IPI0001" but probing via DT.
Eliminate this misleading print info by checking of_node is valid
or not before calling of_ipmi_probe().
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Pull TPM updates from James Morris:
"Here are the TPM updates from Jarkko for v4.14, which I've placed in
their own branch (next-tpm). I ended up cherry-picking them as other
changes had been made in Jarkko's branch after he sent me his original
pull request.
I plan on maintaining a separate branch for TPM (and other security
subsystems) from now on.
From Jarkko: 'Not much this time except a few fixes'"
* 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
tpm: ibmvtpm: simplify crq initialization and document crq format
tpm: replace msleep() with usleep_range() in TPM 1.2/2.0 generic drivers
Documentation: tpm: add powered-while-suspended binding documentation
tpm: tpm_crb: constify acpi_device_id.
tpm: vtpm: constify vio_device_id
The crq is passed in registers and is the same on BE and LE hosts.
However, current implementation allocates a structure on-stack to
represent the crq, initializes the members swapping them to BE, and
loads the structure swapping it from BE. This is pointless and causes
GCC warnings about ununitialized members. Get rid of the structure and
the warnings.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
The patch simply replaces all msleep function calls with usleep_range calls
in the generic drivers.
Tested with an Infineon TPM 1.2, using the generic tpm-tis module, for a
thousand PCR extends, we see results going from 1m57s unpatched to 40s
with the new patch. We obtain similar results when using the original and
patched tpm_infineon driver, which is also part of the patch.
Similarly with a STM TPM 2.0, using the CRB driver, it takes about 20ms per
extend unpatched and around 7ms with the new patch.
Note that the PCR consistency is untouched with this patch, each TPM has
been tested with 10 million extends and the aggregated PCR value is
continuously verified to be correct.
As an extension of this work, this could potentially and easily be applied
to other vendor's drivers. Still, these changes are not included in the
proposed patch as they are untested.
Signed-off-by: Hamza Attak <hamza@hpe.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
acpi_device_id are not supposed to change at runtime. All functions
working with acpi_device_id provided by <acpi/acpi_bus.h> work with
const acpi_device_id. So mark the non-const structs as const.
File size before:
text data bss dec hex filename
4198 608 0 4806 12c6 drivers/char/tpm/tpm_crb.o
File size After adding 'const':
text data bss dec hex filename
4262 520 0 4782 12ae drivers/char/tpm/tpm_crb.o
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
vio_device_id are not supposed to change at runtime. All functions
working with vio_device_id provided by <asm/vio.h> work with
const vio_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
... and __initconst if applicable.
Based on similar work for an older kernel in the Grsecurity patch.
[JD: fix toshiba-wmi build]
[JD: add htcpen]
[JD: move __initconst where checkscript wants it]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
- removal of the old dma_alloc_noncoherent interface
- remove unused flags to dma_declare_coherent_memory
- restrict OF DMA configuration to specific physical busses
- use the iommu mailing list for dma-mapping questions and
patches
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Merge tag 'dma-mapping-4.14' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping updates from Christoph Hellwig:
- removal of the old dma_alloc_noncoherent interface
- remove unused flags to dma_declare_coherent_memory
- restrict OF DMA configuration to specific physical busses
- use the iommu mailing list for dma-mapping questions and patches
* tag 'dma-mapping-4.14' of git://git.infradead.org/users/hch/dma-mapping:
dma-coherent: fix dma_declare_coherent_memory() logic error
ARM: imx: mx31moboard: Remove unused 'dma' variable
dma-coherent: remove an unused variable
MAINTAINERS: use the iommu list for the dma-mapping subsystem
dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags
dma-coherent: remove the DMA_MEMORY_INCLUDES_CHILDREN flag
of: restrict DMA configuration
dma-mapping: remove dma_alloc_noncoherent and dma_free_noncoherent
i825xx: switch to switch to dma_alloc_attrs
au1000_eth: switch to dma_alloc_attrs
sgiseeq: switch to dma_alloc_attrs
dma-mapping: reduce dma_mapping_error inline bloat
Here is the big char/misc driver update for 4.14-rc1.
Lots of different stuff in here, it's been an active development cycle
for some reason. Highlights are:
- updated binder driver, this brings binder up to date with what
shipped in the Android O release, plus some more changes that
happened since then that are in the Android development trees.
- coresight updates and fixes
- mux driver file renames to be a bit "nicer"
- intel_th driver updates
- normal set of hyper-v updates and changes
- small fpga subsystem and driver updates
- lots of const code changes all over the driver trees
- extcon driver updates
- fmc driver subsystem upadates
- w1 subsystem minor reworks and new features and drivers added
- spmi driver updates
Plus a smattering of other minor driver updates and fixes.
All of these have been in linux-next with no reported issues for a
while.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH:
"Here is the big char/misc driver update for 4.14-rc1.
Lots of different stuff in here, it's been an active development cycle
for some reason. Highlights are:
- updated binder driver, this brings binder up to date with what
shipped in the Android O release, plus some more changes that
happened since then that are in the Android development trees.
- coresight updates and fixes
- mux driver file renames to be a bit "nicer"
- intel_th driver updates
- normal set of hyper-v updates and changes
- small fpga subsystem and driver updates
- lots of const code changes all over the driver trees
- extcon driver updates
- fmc driver subsystem upadates
- w1 subsystem minor reworks and new features and drivers added
- spmi driver updates
Plus a smattering of other minor driver updates and fixes.
All of these have been in linux-next with no reported issues for a
while"
* tag 'char-misc-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (244 commits)
ANDROID: binder: don't queue async transactions to thread.
ANDROID: binder: don't enqueue death notifications to thread todo.
ANDROID: binder: Don't BUG_ON(!spin_is_locked()).
ANDROID: binder: Add BINDER_GET_NODE_DEBUG_INFO ioctl
ANDROID: binder: push new transactions to waiting threads.
ANDROID: binder: remove proc waitqueue
android: binder: Add page usage in binder stats
android: binder: fixup crash introduced by moving buffer hdr
drivers: w1: add hwmon temp support for w1_therm
drivers: w1: refactor w1_slave_show to make the temp reading functionality separate
drivers: w1: add hwmon support structures
eeprom: idt_89hpesx: Support both ACPI and OF probing
mcb: Fix an error handling path in 'chameleon_parse_cells()'
MCB: add support for SC31 to mcb-lpc
mux: make device_type const
char: virtio: constify attribute_group structures.
Documentation/ABI: document the nvmem sysfs files
lkdtm: fix spelling mistake: "incremeted" -> "incremented"
perf: cs-etm: Fix ETMv4 CONFIGR entry in perf.data file
nvmem: include linux/err.h from header
...
Here is the "big" driver core update for 4.14-rc1.
It's really not all that big, the largest thing here being some firmware
tests to help ensure that that crazy api is working properly.
There's also a new uevent for when a driver is bound or unbound from a
device, fixing a hole in the driver model that's been there since the
very beginning. Many thanks to Dmitry for being persistent and pointing
out how wrong I was about this all along :)
Patches for the new uevents are already in the systemd tree, if people
want to play around with them.
Otherwise just a number of other small api changes and updates here,
nothing major. All of these patches have been in linux-next for a
while with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core update from Greg KH:
"Here is the "big" driver core update for 4.14-rc1.
It's really not all that big, the largest thing here being some
firmware tests to help ensure that that crazy api is working properly.
There's also a new uevent for when a driver is bound or unbound from a
device, fixing a hole in the driver model that's been there since the
very beginning. Many thanks to Dmitry for being persistent and
pointing out how wrong I was about this all along :)
Patches for the new uevents are already in the systemd tree, if people
want to play around with them.
Otherwise just a number of other small api changes and updates here,
nothing major. All of these patches have been in linux-next for a
while with no reported issues"
* tag 'driver-core-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (28 commits)
driver core: bus: Fix a potential double free
Do not disable driver and bus shutdown hook when class shutdown hook is set.
base: topology: constify attribute_group structures.
base: Convert to using %pOF instead of full_name
kernfs: Clarify lockdep name for kn->count
fbdev: uvesafb: remove DRIVER_ATTR() usage
xen: xen-pciback: remove DRIVER_ATTR() usage
driver core: Document struct device:dma_ops
mod_devicetable: Remove excess description from structured comment
test_firmware: add batched firmware tests
firmware: enable a debug print for batched requests
firmware: define pr_fmt
firmware: send -EINTR on signal abort on fallback mechanism
test_firmware: add test case for SIGCHLD on sync fallback
initcall_debug: add deferred probe times
Input: axp20x-pek - switch to using devm_device_add_group()
Input: synaptics_rmi4 - use devm_device_add_group() for attributes in F01
Input: gpio_keys - use devm_device_add_group() for attributes
driver core: add devm_device_add_group() and friends
driver core: add device_{add|remove}_group() helpers
...
Pull parisc updates from Helge Deller:
"Major changes include:
- Full support of the firmware Page Deallocation Table with
MADV_HWPOISON and MADV_SOFT_OFFLINE. A kernel thread scans
regularily for new bad memory pages.
- Full support for self-extracting kernel.
- Added UBSAN support.
- Lots of section mismatch fixes across all parisc drivers.
- Added examples for %pF and %pS usage in printk-formats.txt"
* 'parisc-4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (28 commits)
printk-formats.txt: Add examples for %pF and %pS usage
parisc: Fix up devices below a PCI-PCI MegaRAID controller bridge
parisc/core: Fix section mismatches
parisc/ipmi_si_intf: Fix section mismatches on parisc platform
parisc/input/hilkbd: Fix section mismatches
parisc/net/lasi_82596: Fix section mismatches
parisc/serio: Fix section mismatches in gscps2 and hp_sdc drivers
parisc: Fix section mismatches in parisc core drivers
parisc/parport_gsc: Fix section mismatches
parisc/scsi/lasi700: Fix section mismatches
parisc/scsi/zalon: Fix section mismatches
parisc/8250_gsc: Fix section mismatches
parisc/mux: Fix section mismatches
parisc/sticore: Fix section mismatches
parisc/harmony: Fix section mismatches
parisc: Wire up support for self-extracting kernel
parisc: Make existing core files reuseable for bootloader
parisc: Add core code for self-extracting kernel
parisc: Enable UBSAN support
parisc/random: Add machine specific randomness
...
Pull x86 asm updates from Ingo Molnar:
- Introduce the ORC unwinder, which can be enabled via
CONFIG_ORC_UNWINDER=y.
The ORC unwinder is a lightweight, Linux kernel specific debuginfo
implementation, which aims to be DWARF done right for unwinding.
Objtool is used to generate the ORC unwinder tables during build, so
the data format is flexible and kernel internal: there's no
dependency on debuginfo created by an external toolchain.
The ORC unwinder is almost two orders of magnitude faster than the
(out of tree) DWARF unwinder - which is important for perf call graph
profiling. It is also significantly simpler and is coded defensively:
there has not been a single ORC related kernel crash so far, even
with early versions. (knock on wood!)
But the main advantage is that enabling the ORC unwinder allows
CONFIG_FRAME_POINTERS to be turned off - which speeds up the kernel
measurably:
With frame pointers disabled, GCC does not have to add frame pointer
instrumentation code to every function in the kernel. The kernel's
.text size decreases by about 3.2%, resulting in better cache
utilization and fewer instructions executed, resulting in a broad
kernel-wide speedup. Average speedup of system calls should be
roughly in the 1-3% range - measurements by Mel Gorman [1] have shown
a speedup of 5-10% for some function execution intense workloads.
The main cost of the unwinder is that the unwinder data has to be
stored in RAM: the memory cost is 2-4MB of RAM, depending on kernel
config - which is a modest cost on modern x86 systems.
Given how young the ORC unwinder code is it's not enabled by default
- but given the performance advantages the plan is to eventually make
it the default unwinder on x86.
See Documentation/x86/orc-unwinder.txt for more details.
- Remove lguest support: its intended role was that of a temporary
proof of concept for virtualization, plus its removal will enable the
reduction (removal) of the paravirt API as well, so Rusty agreed to
its removal. (Juergen Gross)
- Clean up and fix FSGS related functionality (Andy Lutomirski)
- Clean up IO access APIs (Andy Shevchenko)
- Enhance the symbol namespace (Jiri Slaby)
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (47 commits)
objtool: Handle GCC stack pointer adjustment bug
x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for stub32_clone()
x86/fpu/math-emu: Add ENDPROC to functions
x86/boot/64: Extract efi_pe_entry() from startup_64()
x86/boot/32: Extract efi_pe_entry() from startup_32()
x86/lguest: Remove lguest support
x86/paravirt/xen: Remove xen_patch()
objtool: Fix objtool fallthrough detection with function padding
x86/xen/64: Fix the reported SS and CS in SYSCALL
objtool: Track DRAP separately from callee-saved registers
objtool: Fix validate_branch() return codes
x86: Clarify/fix no-op barriers for text_poke_bp()
x86/switch_to/64: Rewrite FS/GS switching yet again to fix AMD CPUs
selftests/x86/fsgsbase: Test selectors 1, 2, and 3
x86/fsgsbase/64: Report FSBASE and GSBASE correctly in core dumps
x86/fsgsbase/64: Fully initialize FS and GS state in start_thread_common
x86/asm: Fix UNWIND_HINT_REGS macro for older binutils
x86/asm/32: Fix regs_get_register() on segment registers
x86/xen/64: Rearrange the SYSCALL entries
x86/asm/32: Remove a bunch of '& 0xffff' from pt_regs segment reads
...
As seen from the implementation of the single class shutdown hook this
is not very sound design.
Rename the class shutdown hook to shutdown_pre to make it clear it runs
before the driver shutdown hook.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
attribute_group are not supposed to change at runtime. All functions
working with attribute_group provided by <linux/sysfs.h> work with
const attribute_group. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
attribute_group are not supposed to change at runtime. All functions
working with attribute_group provided by <linux/sysfs.h> work with
const attribute_group. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pci_device_id are not supposed to change at runtime. All functions
working with pci_device_id provided by <linux/pci.h> work with
const pci_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch fixes the below warning
--> Use #include <linux/io.h> instead of <asm/io.h>
--> Use #include <linux/uaccess.h> instead of <asm/uaccess.h>
--> please, no space before tabs
--> Block comments use a trailing */ on a separate line
--> Possible unnecessary 'out of memory' message
--> Block comments use * on subsequent lines
--> Block comments use a trailing */ on a separate line
--> braces {} are not necessary for any arm of this statement
--> DT compatible string "xlnx,opb-hwicap-1.00.b"
appears un-documented
--> DT compatible string "xlnx,xps-hwicap-1.00.a"
appears un-documented
Signed-off-by: Nava kishore Manne <navam@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
