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BCM270X_DT: Set spidev spi-max-frequency to 125MHz
The BCM2835 SPI controllers have a maximum bus clock of half the system clock speed, so with the 250MHz system clock found on Raspberry Pis you get a theoretical maximum bus speed of 125MHz. Note that this speed is unlikely to be reliable, and the maximum usable bus spee will depend on both the attached device and the wiring. See: raspberrypi#2165 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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