[PATCH v2 6/6] test: dm: spi: Add testcase for spi_claim_bus()

[Simon Glass]

Add testcase for spi_claim_bus(), which checks that sandbox spi bus
speed/mode settings are updated correctly when multiple slaves use
the bus consecutively. The following configurations are used for the
two spi slaves involved:
  * different max_hz / different modes
  * different max_hz / same modes
  * different modes / same max_hz

asm/test.h header is added in order to be able to retrieve the current
speed/mode of the sandbox spi bus, via sandbox_spi_get_{speed, mode}.

Signed-off-by: Ovidiu Panait <ovidiu.panait at windriver.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- add reviewed-by tag
- properly restore slave_a->mode from platdata:
  <snip>
  -       slave_a->mode = slave_plat->max_hz;
  +       slave_a->mode = slave_plat->mode;

 test/dm/spi.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

Applied to u-boot-dm/next, thanks!