Add two new facts to of_get_next_child() documentation:

   * of_get_next_child() returns NULL when there is not next child

   * of_get_next_child() decrements the refcount of prev
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
Signed-off-by: NRob Herring <robh@kernel.org>

During the course of the overlay selftests some of them remain
applied. While this does not pose a real problem, make sure you track
them and destroy them at the end of the test.
Signed-off-by: NPantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: NRob Herring <robh@kernel.org>

The allocation size of device node path is off by one which drops the
'\0' terminator.
Signed-off-by: NRicky Liang <jcliang@chromium.org>
Signed-off-by: NRob Herring <robh@kernel.org>

Provide a libfdt-based equivalent for of_device_is_big_endian(), suitable
for use in the early_init_* functions.
Signed-off-by: NKevin Cernekee <cernekee@gmail.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NRob Herring <robh@kernel.org>

SoC peripherals can come in several different flavors:

 - little-endian: registers always need to be accessed in LE mode (so the
   kernel should perform a swap if the CPU is running BE)

 - big-endian: registers always need to be accessed in BE mode (so the
   kernel should perform a swap if the CPU is running LE)

 - native-endian: the bus will automatically swap accesses, so the kernel
   should never swap

Introduce a function that checks an OF device node to see whether it
contains a "big-endian" or "native-endian" property.  For the former case,
always return true.  For the latter case, return true iff the kernel was
built for BE (implying that the BE MMIO accessors do not perform a swap).
Otherwise return false, assuming LE registers.

LE registers are assumed by default because most existing drivers (libahci,
serial8250, usb) always use readl/writel in the absence of instructions
to the contrary, so that will be our fallback.
Signed-off-by: NKevin Cernekee <cernekee@gmail.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NRob Herring <robh@kernel.org>

Commit 51975db0 ("of/flattree: merge early_init_dt_scan_memory()
common code") consolidated some code from PowerPC (typically
big-endian), and ended-up adding a pr_debug() printing reg properties in
big-endian (DT native) format, not CPU endian.

This debug print suffers from two problems:
- we only print 4 "reg" values, while there could be more on typical
  systems having multiple memory ranges
- we print these 4 "reg" values in FDT endianess, that is big-endian,
  and these values could be confusing for little-endian configurations

Since we are already printing the base address and size of the memory
regions parsed by early_init_dt_scan_memory() later in a way that is
both endian correct, and takes into account arbitrary number of memory
banks, just remove that part of the debug print.
Suggested-by: NFrank Rowand <frowand.list@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NRob Herring <robh@kernel.org>

If CONFIG_IRQ_DOMAIN=n:

drivers/of/irq.c: In function ‘of_irq_get’:
drivers/of/irq.c:406: error: implicit declaration of function ‘irq_find_host’
drivers/of/irq.c:406: warning: assignment makes pointer from integer without a cast
make[2]: *** [drivers/of/irq.o] Error 1
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NRob Herring <robh@kernel.org>

The previous commit, "of/unittest: early return from test skips tests"
exposed broken tests for the of_platform_unpopulate() function. The
problem was the populate and depopulate calls were not symmetrical like
they were intended to be, and unpopulate depends on the parent device to
have it's of_node pointer pointing to the parent device node. Fix these
bugs so that the test case works correctly.

In the process, the test_bus used as a container for the test devices
has been changed from a statically allocated struct device (which is
bad) to a properly allocated device with a .release() method (which is
good). This stops the test code from being a bad example of abusing the
device model.
Signed-off-by: NGrant Likely <grant.likely@linaro.org>
Cc: Frank Rowand <frank.rowand@sonymobile.com>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Cc: Pawel Moll <pawel.moll@arm.com>

Fix bugs pointed out by checkpatch: Mis-coding of two if statements
caused early return from function.

Number of tests completed increased from 102 to 107.
Number of tests failed increased from 0 to 2.
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

Fix warnings pointed out by checkpatch.

Checkpatch warns: externs should be avoided in .c files

Reducing pain for future maintainers - adding a comment so that anyone trying
to find where the extern data is created will be able to find it.
(grep will not find that location)
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

Fix warnings pointed out by checkpatch.

No bug fixes, but reduce the number of checkpatch warnings so that future
problems will stand out better.
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

Fix bug pointed out by checkpatch.

Splitting string incorrectly removed a space between two words.
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

Fix warnings pointed out by checkpatch.

No bugs fixed, but the test code should be a good example of how to use
the devicetree API.
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

of_get_mac_address() basically does the same  thing thrice, every  time with  a
different  property  name,  so it makes sense to factor out the repetitive code
into separate function. While at it, we can start using ETH_ALEN instead of the
bare number and drop unnecessary parens around the property length check.

The resulting ARM object file is 100 bytes less in size than before the patch.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

The "sdc" node is missing the ranges property, it needs to be treated
as having an empty one otherwise translation fails for its children.

Fixes 746c9e9f, "of/base: Fix PowerPC address parsing hack"
Tested-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>
Cc: Stable <stable@vger.kernel.org> # v3.18+

Currently OF_DYNAMIC and OF_OVERLAY are not visible to the user, and are
selected automatically only when needed.

Allow them to be enabled manually to improve device tree unit test
coverage.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

The "sdc" node is missing the ranges property, it needs to be treated
as having an empty one otherwise translation fails for its children.

Fixes 746c9e9f, "of/base: Fix PowerPC address parsing hack"
Tested-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>
Cc: Stable <stable@vger.kernel.org> # v3.18+

This patch just replace the string 'selftest' with 'unittest'
in OF unittest and data and binding file.

I have tested it successfully on ARM.
Signed-off-by: NWang Long <long.wanglong@huawei.com>
Signed-off-by: NRob Herring <robh@kernel.org>

If CONFIG_OF_UNITTEST=y then a kernel image make will always cause .version to
be incremented, even if there are not source changes.  This is caused by
a lack of dependency tracking and checking for
drivers/of/unittest-data/testcases.dtb.o.
Signed-off-by: NFrank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: NRob Herring <robh@kernel.org>

This reverts commit 2fa645cb.

The assumption that at least 1 preferred console will be registered
when the stdout-path property is set is invalid, which can result
in _no_ consoles.
Signed-off-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Commit 106937e8 ("of: fix handling of '/' in options for
of_find_node_by_path()") caused a regression in OF handling of
stdout-path. While it fixes some cases which have '/' after the ':', it
breaks cases where there is more than one '/' *before* the ':'.

For example, it breaks this boot string

  stdout-path = "/rdb/serial@f040ab00:115200";

So rather than doing sequentialized checks (first for '/', then for ':';
or vice versa), to get the correct behavior we need to check for the
first occurrence of either one of them.

It so happens that the handy strcspn() helper can do just that.

Fixes: 106937e8 ("of: fix handling of '/' in options for of_find_node_by_path()")
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: stable@vger.kernel.org # 3.19
Acked-by: NLeif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>

There were regressions seen with commit 106937e8 ("of: fix handling
of '/' in options for of_find_node_by_path()"), where we couldn't handle
extra '/' before the ':'. Let's test for this now.

Confirmed that this test fails without the previous patch and passes
when patched. All other tests pass.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NLeif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>

The error code paths that require cleanup use a goto to jump to the
cleanup code and return an error code. However, the error code variable
res, which is initialized to -EINVAL when declared, is then overwritten
with the return value of of_parse_phandle_with_args(), and reused as the
return code from of_irq_parse_one(). This leads to an undetermined error
being returned instead of the expected -EINVAL value. Fix it.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: stable@vger.kernel.org # 3.13+
Signed-off-by: NRob Herring <robh@kernel.org>

I2C supports adding adapters using either a dynamic or fixed id. The
latter is provided by aliases in the DT case. To prevent id collisions
of those two types, install this function which gives us the highest
fixed id, so we can then let the dynamically created ones come after
this highest number.
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Calculate the dma_mask and coherent_dma_mask based on the dma-range values
set in DT for the device.

Limit the mask to lower of the default mask and mask calculated.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Will Deacon <will.deacon@arm.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

Export of_mdio_parse_addr() which allows parsing a given Ethernet PHY
node MDIO address, verify it is within the allowed range, and return
its value. This is going to be useful for the DSA code which needs to
deal with multiple layers of MDIO buses.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add testcase variants with '/' in the options string to test for
scan beyond end path name terminated by ':'.
Signed-off-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Ensure proper handling of paths with appended options (after ':'),
where those options may contain a '/'.

Fixes: 7914a7c5 ("of: support passing console options with stdout-path")
Reported-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NLeif Lindholm <leif.lindholm@linaro.org>
Cc: <stable@vger.kernel.org> # 3.19
Signed-off-by: NRob Herring <robh@kernel.org>

This patch fix the wrong expected value of of_property_match_string
in of_selftest_property_string.
Signed-off-by: NWang Long <long.wanglong@huawei.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Remove the duplicate of_changeset_init. In of_selftest_changeset
testcase, the "struct of_changeset chgset" is initialized twice,
but only once is enough. so, drop the first initializtion code.
Signed-off-by: NWang Long <long.wanglong@huawei.com>
Signed-off-by: NRob Herring <robh@kernel.org>

The unittest fails to link if I2C or I2C_MUX is a loadable module:

  drivers/built-in.o: In function `selftest_i2c_mux_remove':
  unittest.c:(.text+0xb0ce4): undefined reference to `i2c_del_mux_adapter'

This changes the newly added IS_ENABLED() checks to use IS_BUILTIN()
instead, which evaluates to false if the other driver is a module.
Reported-by: NChen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Fixes: d5e75500 ("of: unitest: Add I2C overlay unit tests.")
Signed-off-by: NRob Herring <robh@kernel.org>

Commit 3e7f7626 ("of/overlay: Do not generate duplicate nodes") removed
the only use of the 'grandchild' variable, which leads to the following build
warning:

drivers/of/overlay.c: In function 'of_overlay_apply_single_device_node':
drivers/of/overlay.c:89:31: warning: unused variable 'grandchild' [-Wunused-variable]
  struct device_node *tchild, *grandchild;
                               ^

Remove this unused variable.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Support for devicetree serial consoles via 'stdout-path' causes
bootconsoles to be disabled when the vt dummy console loads, since
there is no preferred console (the preferred console is not added
until the device is probed).

Ensure there is at least a preferred console, even if never matched.

Requires: "console: Fix console name size mismatch"
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Add of_pci_dma_configure() to allow updating the DMA configuration of the
PCI device using the configuration from DT of the parent of the root bridge
device.  Use the newly added APIs pci_get/put_host_bridge_device() for
implementing this.

[bhelgaas: fold in fix for host bridges with no parent OF device]
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NRob Herring <robh+dt@kernel.org>
Acked-by: NWill Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>

Fix the dma-range size when the DT attribute is missing, i.e., set size to
dev->coherent_dma_mask + 1 instead of dev->coherent_dma_mask.  Also add
code to check invalid values of size configured in DT and log error.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>

Move of_dma_configure() to device.c so it can be re-used for PCI devices to
obtain DMA configuration from DT.  Also add a second argument so that for
PCI, the DT node of root bus host bridge can be used to obtain the DMA
configuration for the slave PCI device.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NWill Deacon <will.deacon@arm.com>
Acked-by: NRob Herring <robh+dt@kernel.org>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>

of_iommu_configure() is called from of_dma_configure() to setup iommu ops
using DT property.  This API is currently used for platform devices for
which DMA configuration (including IOMMU ops) may come from the device's
parent.  To extend this functionality for PCI devices, this API needs to
take a parent node ptr as an argument instead of assuming device's parent.
This is needed since for PCI, the DMA configuration may be defined in the
DT node of the root bus bridge's parent device.  Currently only dma-range
is used for PCI and IOMMU is not supported.  Return error if the device is
PCI.

Add "parent" parameter (a struct device_node *) to of_iommu_configure().

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NRob Herring <robh+dt@kernel.org>
Acked-by: NWill Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>

The overlay code uses IDRs but does not explicitly include the header
providing the interface, instead relying on an implicit inclusion. Make
the dependency explicit to avoid potential future build issues if the
implicit inclusion goes away.
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NRob Herring <robh@kernel.org>

The whole menu already depends on OF, so there is no need to additionaly specify it.
Suggested-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: NRob Herring <robh@kernel.org>

Signed-off-by: NMatwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: NRob Herring <robh@kernel.org>