i2c_set_input_clk(): fix an F1-ism.

i2c_set_input_clk()'s documentation says that the maximum peripheral
clock frequency is 36 MHz, but that's a hard-coded magic number. The
actual limit is the device's APB frequency or 46 MHz, whichever is
lower (F2 and F4 share the 46 MHz limit).

Fix the documentation to reflect that fact, and add an internal
series-provided function to get the maximum clock frequency for a
device. To help users porting to F2, have i2c_set_input_clk()
assert-check that the provided frequency is less than that maximum
value and the hard 46 MHz limit.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

0 files changed, 0 insertions, 0 deletions