spi_ir_freq.py

# Define the clock frequencies
# From printing the tbl variable inside geni_se_clk_freq_match
clock_frequencies = [
    19200000,
    32000000,
    48000000,
    64000000,
    96000000,
    100000000,
    120000000,
]

# Maximum divisor (inclusive)
# From include/linux/soc/qcom/geni-se.h
# CLK_DIV_MSK = GENMASK(15, 4), which is 12 bits, 0 to 4095
max_divisor = 4095

# Maximum SPI frequency from dts
SPI_MAX_FREQ = 5000000

# Calculate the available IR frequencies
ir_frequencies = set()
for clock in clock_frequencies:
    for divisor in range(1, max_divisor + 1):
        if clock // divisor <= SPI_MAX_FREQ:
            ir_frequencies.add(clock // (divisor * 16))

# Sort the IR frequencies
sorted_ir_frequencies = sorted(ir_frequencies)

# List to store the fully covered ranges
covered_ranges = []

VALID_ERROR = 0.02

# Check the ranges of each frequency
for freq in sorted_ir_frequencies:
    lower_bound = freq * (1 - VALID_ERROR)
    upper_bound = freq * (1 + VALID_ERROR)

    if len(covered_ranges) and lower_bound <= covered_ranges[-1][1]:
        print(f"Extend {covered_ranges[-1][1]} to {upper_bound}")
        covered_ranges[-1][1] = upper_bound
        continue

    covered_ranges.append([lower_bound, upper_bound])

# Output the fully covered ranges
print("Fully covered ranges:", covered_ranges)

# # Plot the filtered IR frequencies
# import matplotlib.pyplot as plt

# # Prepare the plot
# plt.figure(figsize=(10, 6))

# # For each frequency, plot a horizontal line with 2% tolerance
# for freq in filtered_ir_frequencies:
#     plt.plot([freq * (1 - VALID_ERROR), freq * (1 + VALID_ERROR)], [freq, freq], color='b')

# # Set plot details
# plt.title("IR Frequencies with ±1% Tolerance")
# plt.xlabel("Frequency Range (Hz)")
# plt.ylabel("Frequency (Hz)")
# plt.grid(True)
# plt.show()