diff options
| -rw-r--r-- | src/soc/nvidia/tegra124/include/soc/clock.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra124/include/soc/clock.h b/src/soc/nvidia/tegra124/include/soc/clock.h index c0a3f398e3..d4c504642b 100644 --- a/src/soc/nvidia/tegra124/include/soc/clock.h +++ b/src/soc/nvidia/tegra124/include/soc/clock.h @@ -225,6 +225,17 @@ enum { #define clock_configure_source(device, src, freq) \ clock_configure_irregular_source(device, src, freq, src) +/* The I2C divisors are not 7.1 divisors like the others, they divide by n + 1 + * directly. Also, there are internal divisors in the I2C controller itself. + * We can deal with those here and make it easier to select what the actual + * bus frequency will be. The 0x19 value is the default divisor in the + * clk_divisor register in the controller, and 8 is just a magic number in the + * documentation. Multiplying by 2 compensates for the different format of the + * divisor. + */ +#define clock_configure_i2c_scl_freq(device, src, freq) \ + clock_configure_source(device, src, (freq) * (0x19 + 1) * 8 * 2) + enum clock_source { /* Careful: Not true for all sources, always check TRM! */ PLLP = 0, PLLC2 = 1, |