net: phy: spi_ks8995: generalize creation of SPI commands
Prepare creating SPI reads and writes for other switch families. The KS8995 family uses the straight forward <8bit CMD><8bit ADDR> sequence. To be able to support KSZ8795 family, which uses <3bit CMD><12bit ADDR><1 bit TR> make the SPI command creation chip variant dependent. Signed-off-by: NHelmut Buchsbaum <helmut.buchsbaum@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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