snowball/igloo-kernel.git/drivers/of, branch u0

dt: add of_platform_prepare() to match nodes with static platform_devices

2011-03-29T03:20:53+00:00

This patch implements an alternate method for using device tree data for populating machine device registration. Traditionally, board support has directly generated and registered devices based on nodes in the device tree. The board support code starts at the root of the tree and begins allocating devices for each device node it finds. Similarly, bus drivers (i2c, spi, etc.) use their child nodes to register child devices. This model can be seen in almost all the powerpc board ports (arch/powerpc/platforms/*). However, for many of the ARM SoCs, there already exists complete board support for many SoCs that have their own code for registering the basic set of platform devices with non-trivial dependencies on clock structure and machine specific platform code. While starting at the base of the tree and working up is certainly possible, it requires modifying a lot of machine support code to get it working. This patch adds the function of_platform_prepare() to declare which nodes will be used to create platform_devices without actually creating them yet. Then it uses a bus notifier to inspect platform_device registrations. If any match a node declared with of_platform_prepare(), it will set the of_node pointer before the device gets bound to a driver, making the device tree data available at probe time. After all the static devices are registered, the platform code can still call either of_platform_populate or of_platform_bus_probe() on the same nodes that were declared with of_platform_prepare(). Any nodes that *were not* matched to a static platform_device will get created in the normal way. Note: Board ports using this facility are still required to provide a fully populated device tree blob. It is not a shortcut to providing an accurate device tree model of the machine to the point that it would be reasonably possible to switch to a direct registration model for all devices without change the device tree. ie. The SoC still needs to be correctly identified and there should be nodes for all the discrete devices. v2: Complete revamp to make of_platform_populate() and of_platform_bus_probe() respect the prepared nodes. Signed-off-by: Grant Likely

dt: add of_platform_populate() for creating device from the device tree

2011-03-29T03:20:47+00:00

of_platform_populate() is similar to of_platform_bus_probe() except that it strictly enforces that all device nodes must have a compatible property, and it can be used to register devices (not buses) which are children of the root node. This patch also modifies MPC5200 support to use the new function. Signed-off-by: Grant Likely

dt: eliminate OF_NO_DEEP_PROBE and test for NULL match table

2011-03-29T03:20:43+00:00

There are no users of OF_NO_DEEP_PROBE, and of_match_node() now gracefully handles being passed a NULL pointer, so the checks at the top of of_platform_bus_probe can be dropped. While at it, consolidate the root node pointer check to be easier to read and tidy up related comments. Signed-off-by: Grant Likely

dt: protect against NULL matches passed to of_match_node()

2011-03-29T03:20:40+00:00

There are a few use cases where it is convenient to pass NULL to of_match_node() and have it fail gracefully. The patch adds a null check to the beginning so taht it does so. Signed-off-by: Grant Likely

dt: Refactor of_platform_bus_probe()

2011-03-29T03:20:32+00:00

The current implementation uses three copies of of basically identical code. This patch consolidates them to make the code simpler. Signed-off-by: Grant Likely

of/promtree: allow DT device matching by fixing 'name' brokenness (v5)

2011-03-02T20:45:19+00:00

Commit e2f2a93b, "of/promtree: add package-to-path support to pdt" changed dp->name from using the 'name' property to using package-to-path. This fixed /proc/device-tree creation by eliminating conflicts between names (the 'name' property provides names like 'battery', whereas package-to-path provides names like '/foo/bar/battery@0', which we stripped to 'battery@0'). However, it also breaks of_device_id table matching. The fix that we _really_ wanted was to keep dp->name based upon the name property ('battery'), but based dp->full_name upon package-to-path ('battery@0'). This patch does just that. This changes all users (except SPARC) of promtree to use the full result from package-to-path for full_name, rather than stripping the directory out. In practice, the strings end up being exactly the same; this change saves time, code, and memory. SPARC continues to use the existing build_path_component() code. v2: combine two patches and revert of_pdt_node_name to original version v3: use dp->phandle instead of passing around node v4: warn/bail out for non-sparc archs if pkg2path is not set v5: split of_pdt_build_full_name into sparc & non-sparc versions v6: Pass NULL to pkg2path before buf gets assigned. Drop check for pkg2path hook on each and every node. v7: Don't BUG() when unable to get the full_path; create a known-unique name instead. Signed-off-by: Andres Salomon Signed-off-by: Grant Likely

dt/flattree: Return virtual address from early_init_dt_alloc_memory_arch()

2011-01-16T05:01:58+00:00

The physical address is never used by the device tree code when allocating memory for unflattening. Change the architecture's alloc hook to return the virutal address instead. Signed-off-by: Grant Likely

Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6

2011-01-10T16:57:03+00:00

* 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6: (29 commits) of/flattree: forward declare struct device_node in of_fdt.h ipmi: explicitly include of_address.h and of_irq.h sparc: explicitly cast negative phandle checks to s32 powerpc/405: Fix missing #{address,size}-cells in i2c node powerpc/5200: dts: refactor dts files powerpc/5200: dts: Change combatible strings on localbus powerpc/5200: dts: remove unused properties powerpc/5200: dts: rename nodes to prepare for refactoring dts files of/flattree: Update dtc to current mainline. of/device: Don't register disabled devices powerpc/dts: fix syntax bugs in bluestone.dts of: Fixes for OF probing on little endian systems of: make drivers depend on CONFIG_OF instead of CONFIG_PPC_OF of/flattree: Add of_flat_dt_match() helper function of_serial: explicitly include of_irq.h of/flattree: Refactor unflatten_device_tree and add fdt_unflatten_tree of/flattree: Reorder unflatten_dt_node of/flattree: Refactor unflatten_dt_node of/flattree: Add non-boottime device tree functions of/flattree: Add Kconfig for EARLY_FLATTREE ... Fix up trivial conflict in arch/sparc/prom/tree_32.c as per Grant.

of/device: Don't register disabled devices

2011-01-03T23:02:49+00:00

Device nodes with the property status="disabled" are not usable and so don't register them when parsing the device tree for devices. Signed-off-by: Grant Likely Cc: Hollis Blanchard Cc: Deepak Saxena Cc: Scott Wood , Cc: David Gibson Cc: Benjamin Herrenschmidt

of/flattree: Add of_flat_dt_match() helper function

2011-01-01T20:03:25+00:00

This patch adds of_flat_dt_match() which tests a node for compatibility with a list of values and converts the relevant powerpc platform code to use it. This approach simplifies the board support code a bit. Signed-off-by: Grant Likely Reviewed-by: Stephen Neuendorffer