Jon Hunter 11670f570d spi: Fix build for Linux v6.8 ...

For Linux v6.8, support for SPI controllers with multiple chip-selects
was added to the SPI core and this updated the 'chip_select' member of
the 'spi_device' structure to be an array. This breaks building the
Tegra124 SPI Slave driver and Tegra210 QUAD SPI driver.

A helper function, spi_get_chipselect(), was added for Linux v6.3 to
retrieve the chip-select for a SPI device and can be used for retrieving
the chip-select for all Linux v6.3+ kernels.

Add a conftest rule to detecting if spi_get_chipselect() is present and
if so use this for getting the chip-select. This fixes the build issues
for Linux v6.8.

Bug 4448428

Change-Id: Ia4f95ed96b9a18cc7da7a4a52305fc64bc31905c
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3050146
(cherry picked from commit 9e2f7ecdf7)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3051189
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

2024-01-12 02:37:51 -08:00

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