u-boot.git/drivers/core/Makefile, branch v2015.10-rc2

devres: make Devres optional with CONFIG_DEVRES

2015-08-06T13:44:29Z

Currently, Devres requires additional 16 byte for each allocation, which is not so insignificant in some cases. Add CONFIG_DEVRES to make this framework optional. If the option is disabled, devres functions fall back to non-managed variants. For example, devres_alloc() to kzalloc(), devm_kmalloc() to kmalloc(), etc. Because devres_head is also surrounded by an ifdef conditional, there is no memory overhead when CONFIG_DEVRES is disabled. Signed-off-by: Masahiro Yamada Suggested-by: Simon Glass Acked-by: Simon Glass

devres: introduce Devres (Managed Device Resource) framework

2015-08-06T13:44:29Z

In U-Boot's driver model, memory is basically allocated and freed in the core framework. So, low level drivers generally only have to specify the size of needed memory with .priv_auto_alloc_size, .platdata_auto_alloc_size, etc. Nevertheless, some drivers still need to allocate/free memory on their own in case they cannot statically know the necessary memory size. So, I believe it is reasonable enough to port Devres into U-boot. Devres, which originates in Linux, manages device resources for each device and automatically releases them on driver detach. With devres, device resources are guaranteed to be freed whether initialization fails half-way or the device gets detached. The basic idea is totally the same to that of Linux, but I tweaked it a bit so that it fits in U-Boot's driver model. In U-Boot, drivers are activated in two steps: binding and probing. Binding puts a driver and a device together. It is just data manipulation on the system memory, so nothing has happened on the hardware device at this moment. When the device is really used, it is probed. Probing initializes the real hardware device to make it really ready for use. So, the resources acquired during the probing process must be freed when the device is removed. Likewise, what has been allocated in binding should be released when the device is unbound. The struct devres has a member "probe" to remember when the resource was allocated. CONFIG_DEBUG_DEVRES is also supported for easier debugging. If enabled, debug messages are printed each time a resource is allocated/freed. Signed-off-by: Masahiro Yamada Acked-by: Simon Glass

dm: Make regmap and syscon optional

2015-08-06T13:31:36Z

Not all boards use garbage collection in their link step, so we should avoid adding options that rely on this for prevention of code bloat. Add separate Kconfig options for syscon and regmap uclasses. Signed-off-by: Simon Glass

dm: remove redundant CONFIG_DM from driver/core/Makefile

2015-07-21T23:39:34Z

As you see in driver/Makefile, Kbuild descends into the driver/core/ directory only when CONFIG_DM is enabled. Signed-off-by: Masahiro Yamada Acked-by: Simon Glass

dm: Add support for generic system controllers (syscon)

2015-07-21T23:39:24Z

Many SoCs have a number of system controllers which are dealt with as a group by a single driver. It is a pain to have to add lots of compatible strings and/or separate drivers for each. Instead we can identify the controllers by a number and request the address of the one we want. Add a simple implementation of this which can be used by SoC driver code. Signed-off-by: Simon Glass

dm: Add support for register maps (regmap)

2015-07-21T23:39:23Z

Add a simple implementaton of register maps, supporting only direct I/O for now. This can be enhanced later to support buses which have registers, such as I2C, SPI and PCI. It allows drivers which can operate with multiple buses to avoid dealing with the particulars of register access on that bus. Signed-off-by: Simon Glass

dm: Move the tree/uclass dump code into its own file

2015-07-21T23:39:22Z

In SPL it is sometimes useful to be able to obtain a dump of the current driver model state. Since commands are not available, provide a way to directly call the functions to output this information. Adjust the existing commands to use these functions. Signed-off-by: Simon Glass

Remove SPL undefine of CONFIG_OF_CONTROL

2015-06-11T01:26:55Z

Allow SPL to be built with this option so that we can support device tree control. Disable the simple bus for now in SPL. It may be needed later. Signed-off-by: Simon Glass

dm: Allow device removal features to be dropped

2014-11-21T07:13:02Z

For SPL we don't expect to need to remove a device. Save some code space by dropping this feature. The board config can define CONFIG_DM_DEVICE_REMOVE if this is in fact needed. Signed-off-by: Simon Glass Reviewed-by: Tom Rini

dm: core: Add support for simple-bus

2014-10-22T16:36:56Z

Add a driver for the simple-bus nodes, which allows devices within these nodes to be bound. Signed-off-by: Simon Glass