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| author | Martin Sperl <kernel@martin.sperl.org> | 2015-12-14 15:20:18 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-09 19:25:43 +0000 |
| commit | d780c3711d9df9bacd56b71cf23443b895a331ca (patch) | |
| tree | 4c6cf9ae8b0cd70fd6128a9bc2cec1ba1676dc47 /Documentation/input/gamepad.txt | |
| parent | 92e963f50fc74041b5e9e744c330dca48e04f08d (diff) | |
spi: core: added spi_resource management
SPI resource management framework used while processing a spi_message
via the spi-core.
The basic idea is taken from devres, but as the allocation may happen
fairly frequently, some provisioning (in the form of an unused spi_device
pointer argument to spi_res_alloc) has been made so that at a later stage
we may implement reuse objects allocated earlier avoiding the repeated
allocation by keeping a cache of objects that we can reuse.
This framework can get used for:
* rewriting spi_messages
* to fullfill alignment requirements of the spi_master HW
* to fullfill transfer length requirements
(e.g: transfers need to be less than 64k)
* consolidate spi_messages with multiple transfers into a single transfer
when the total transfer length is below a threshold.
* reimplement spi_unmap_buf without explicitly needing to check if it has
been mapped
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation/input/gamepad.txt')