On Wed, Jan 31, 2024 at 05:09:30PM +0100, Geert Uytterhoeven wrote: > Switch the R-Mobile A1, R-Mobile APE6, and SH-Mobile AG5 SoCs to the new > frequency calculation formula, to (a) avoid running the I2C bus too fast, > and (b) bring the low/high ratio closer to the recommended ratio 5/4. > > As this makes fast_clock_dt_config and v2_freq_calc_dt_config identical, > merge them into a single fast_clock_dt_config. > > Legacy SH users (sh7343, sh7366, and sh772[234]) are left alone, and > still use the old formula. > > Measurement results on R-Mobile APE6 and SH-Mobile AG5 (fck=104 MHz, > clks_per_count=2): > 100 kHz: 106 kHz LH=1.12 before, 99.6 kHz L/H=1.22 after > 400 kHz: 384 kHz LH=1.67 before, 392 kHz L/H=1.27 after > > Measurement results on R-Mobile A1 (fck=49.5 MHz, clks_per_count=1): > 100 kHz: 106 kHz L/H=1.09 before, 99.6 kHz L/H=1.20 after > > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
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