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/openbmc/linux/include/linux/fpga/ |
H A D | fpga-mgr.h | 68f6be65 Wed Jun 14 10:36:27 CDT 2017 Anatolij Gustschin <agust@denx.de> fpga: Add flag to indicate SPI bitstream is bit-reversed
Add a flag that is passed to the write_init() callback, indicating that the SPI bitstream starts with LSB first. SPI controllers usually send data with MSB first. If an FPGA expects bitstream data as LSB first, the data must be reversed either by the SPI controller or by the driver.
Alternatively the bitstream could be prepared as bit-reversed to avoid the bit-swapping while sending. This flag indicates such bit-reversed SPI bitstream. The low-level driver will deal with the flag and perform bit-reversing if needed.
Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Joshua Clayton <stillcompiling@gmail.com> Signed-off-by: Alan Tull <atull@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 68f6be65 Wed Jun 14 10:36:27 CDT 2017 Anatolij Gustschin <agust@denx.de> fpga: Add flag to indicate SPI bitstream is bit-reversed Add a flag that is passed to the write_init() callback, indicating that the SPI bitstream starts with LSB first. SPI controllers usually send data with MSB first. If an FPGA expects bitstream data as LSB first, the data must be reversed either by the SPI controller or by the driver. Alternatively the bitstream could be prepared as bit-reversed to avoid the bit-swapping while sending. This flag indicates such bit-reversed SPI bitstream. The low-level driver will deal with the flag and perform bit-reversing if needed. Signed-off-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Joshua Clayton <stillcompiling@gmail.com> Signed-off-by: Alan Tull <atull@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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