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2017-10-17of: overlay: rename identifiers to more reflect what they doFrank Rowand6-271/+310
This patch is aimed primarily at drivers/of/overlay.c, but those changes also have a small impact in a few other files. overlay.c is difficult to read and maintain. Improve readability: - Rename functions, types and variables to better reflect what they do and to be consistent with names in other places, such as the device tree overlay FDT (flattened device tree), and make the algorithms more clear - Use the same names consistently throughout the file - Update comments for name changes - Fix incorrect comments This patch is intended to not introduce any functional change. Signed-off-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-17of: overlay.c: Convert comparisons to zero or NULL to logical expressionsFrank Rowand1-18/+18
Use normal shorthand for comparing a variable to zero. For variable "XXX": convert (XXX == 0) to (!XXX) convert (XXX != 0) to (XXX) Signed-off-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-17of: overlay.c: Remove comments that state the obvious, to reduce clutterFrank Rowand1-29/+18
Follows recommendations in Documentation/process/coding-style.rst, section 8, Commenting. Some in function comments are promoted to function header comments. Signed-off-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-17dt-bindings: Add vendor prefix for Opal Kelly IncTom McLeod1-0/+1
Opal Kelly is a manufacturer of FPGA Integration Modules. Signed-off-by: Tom McLeod <tom.mcleod@opalkelly.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-17of: overlay: fix memory leak related to duplicated propertyLixin Wang1-4/+11
Function of_changeset_add_property or of_changeset_update_property may fails. In this case the property just allocated is never deallocated. Signed-off-by: Lixin Wang <alan.1.wang@nokia-sbell.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: unittest: Remove redundant OF_DETACHED flag settingStephen Boyd1-2/+0
of_fdt_unflatten_tree() already sets the flag on the node to OF_DETACHED, because of_fdt_unflatten_tree() calls __unflatten_device_tree() with the detached bool set to true. Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of/fdt: Document detached argument to __unflatten_device_tree()Stephen Boyd1-0/+1
This wasn't documented. Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of/resolver: Replace kmalloc + memcpy with kmemdup()Stephen Boyd1-2/+1
Save one line. Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of/resolver: Simplify to be32_add_cpu()Stephen Boyd1-4/+1
This is the same as be32_add_cpu(), so simplify the code and remove the now unused local variable. Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of/fdt: skip unflattening of disabled nodesRob Herring1-0/+4
For static DT usecases, we don't need the disabled nodes and can skip unflattening. This saves a significant amount of RAM in memory constrained cases. In one example on STM32F469, the RAM usage goes from 118K to 26K. There are a few cases in the kernel that modify the status property dynamically. These all are changes from enabled to disabled, depend on OF_DYNAMIC or are not FDT based (PDT based). Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of/fdt: add of_fdt_device_is_available functionRob Herring1-3/+14
Add an equivalent function to of_device_is_available for flattened DT, and convert the one existing open coded occurrence. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: make kobject and bin_attribute support configurableRob Herring7-164/+202
Having device_nodes be kobjects is only needed if sysfs or OF_DYNAMIC is enabled. Otherwise, having a kobject in struct device_node is unnecessary bloat in minimal kernel configurations. Likewise, bin_attribute is only needed in struct property when sysfs is enabled, so we can make it configurable too. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: wrap accesses to device_node kobjectRob Herring2-1/+3
In preparation to make kobject element in struct device_node optional, provide and use a macro to return the kobject pointer. The only user outside the DT core is the driver core. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: move kobj_to_device_node() into dynamic.cRob Herring2-6/+5
The only user of kobj_to_device_node() is in dynamic.c, so move it there. This avoids having to make it conditional once kobject is configurable. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: make struct property _flags field configurableRob Herring1-0/+4
Only Sparc and CONFIG_OF_DYNAMIC use the struct property._flags field, so make it conditional shrinking struct property a bit. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: remove struct property.unique_id for FDTRob Herring1-0/+2
Only Sparc uses unique_id, so remove it for FDT builds and shrink struct property a bit making the unflattened DT less of a memory hog. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-16of: fix missing kobject init for !SYSFS && OF_DYNAMIC configRob Herring1-3/+0
The ref counting is broken for OF_DYNAMIC when sysfs is disabled because the kobject initialization is skipped. Only the properties add/remove/update should be skipped for !SYSFS config. Tested-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Frank Rowand <frowand.list@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-13devicetree: Add vendor-prefix for DH electronics GmbHMarek Vasut1-0/+1
Add vendor prefix for DH electronics GmbH, https://www.dh-electronics.com . The company is a SoM and evaluation board manufacturer. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Rob Herring <robh@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-13dt-bindings: iommu: ipmmu-vmsa: Use generic node nameGeert Uytterhoeven1-1/+1
Use the preferred generic node name in the example. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-05dt-bindings: rtc: merge ds1339 in ds1307 documentationAlexandre Belloni2-18/+8
Now that there is documentation for the ds1307 and compatible RTCs, merge the ds1339 documentation in it. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-05dt-bindings: rtc: Add bindings for m41t80 and compatiblesAlexandre Belloni2-2/+31
The ST M41T80 family of RTC are not trivial devices, document them. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Rob Herring <robh@kernel.org>
2017-10-05dt-bindings: rtc: DS1307 and compatibles are not trivialAlexandre Belloni2-6/+36
Document optional properties for ds1307 and compatible RTCs Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Rob Herring <robh@kernel.org>