• Vladimir Oltean's avatar
    net: dsa: sja1105: adapt to a SPI controller with a limited max transfer size · 718bad0e
    Vladimir Oltean authored
    The static config of the sja1105 switch is a long stream of bytes which
    is programmed to the hardware in chunks (portions with the chip select
    continuously asserted) of max 256 bytes each. Each chunk is a
    spi_message composed of 2 spi_transfers: the buffer with the data and a
    preceding buffer with the SPI access header.
    
    Only that certain SPI controllers, such as the spi-sc18is602 I2C-to-SPI
    bridge, cannot keep the chip select asserted for that long.
    The spi_max_transfer_size() and spi_max_message_size() functions are how
    the controller can impose its hardware limitations upon the SPI
    peripheral driver.
    
    For the sja1105 driver to work with these controllers, both buffers must
    be smaller than the transfer limit, and their sum must be smaller than
    the message limit.
    
    Regression-tested on a switch connected to a controller with no
    limitations (spi-fsl-dspi) as well as with one with caps for both
    max_transfer_size and max_message_size (spi-sc18is602).
    Signed-off-by: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    718bad0e
sja1105_main.c 104 KB