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authorThor Thayer <tthayer@opensource.altera.com>2015-03-12 14:19:31 -0500
committerMark Brown <broonie@kernel.org>2015-03-17 12:27:09 +0000
commitdd11444327ce0fd549cce552b04aa441688ef2d3 (patch)
tree837d1035ba6b02b54d3691415feb81caeeccbd08 /drivers/dma/Kconfig
parent2306509605d3cb45b8480089af2d282600650e9e (diff)
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spi: dw-spi: Convert 16bit accesses to 32bit accesses
Altera's Arria10 SoC interconnect requires a 32-bit write for APB peripherals. The current spi-dw driver uses 16-bit accesses in some locations. This patch converts all the 16-bit reads and writes to 32-bit reads and writes. Additional Documentation to Support this Change: The DW_apb_ssi databook states: "All registers in the DW_apb_ssi are addressed at 32-bit boundaries to remain consistent with the AHB bus. Where the physical size of any register is less than 32-bits wide, the upper unused bits of the 32-bit boundary are reserved. Writing to these bits has no effect; reading from these bits returns 0." [1] [1] Section 6.1 of dw_apb_ssi.pdf (version 3.22a) Request for test with platforms using the DesignWare SPI IP. Tested On: Altera CycloneV development kit Altera Arria10 development kit Compile tested for build errors on x86_64 (allyesconfigs) Signed-off-by: Thor Thayer <tthayer@opensource.altera.com> Reviewed-and-tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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