driver: spi: cadence: Add ACPI support
commit 54f2383fed4848ffe5a2402896f6fb5d609cc943 from git@git.assembla.com:cavium/WindRiver.linux.git These changes enables to read the configs from ACPI tables as required for successful probing in ACPI uefi environment. In case of ACPI disabled/dts based environment, it will continue to read configs from dts as before. Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com> Change-Id: Iee96c2a887ccf4fb18fad8558f12cdca548042df Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/99918 Reviewed-by: Chandrakala Chavva <cchavva@marvell.com> Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com> Tested-by: Sunil Kovvuri Goutham <sgoutham@marvell.com> Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>
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