v4l2_get_link_freq(9)

🎀 NAME 🎀

okay so bestie, welcome to the v4l2_get_link_freq(9) page from the Kernel API Manual — it’s giving “get link rate from transmitter” and honestly? iconic behavior 💖

v4l2_get_link_freq - Get link rate from transmitter 🌸

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✨ SYNOPSIS ✨

s64 v4l2_get_link_freq (const struct media_pad *pad , unsigned int mul ,
       unsigned int div );

💅 ARGUMENTS 💅

• pad — the transmitter’s media pad, periodt 🫶
• mul — the multiplier between pixel rate and link frequency. Bits per pixel on D-PHY, samples per clock on parallel. 0 otherwise 💫
• div — the divisor between pixel rate and link frequency. Number of data lanes times two on D-PHY, 1 on parallel. 0 otherwise 🎀

🦋 DESCRIPTION 🦋

so this function literally obtains and returns the link frequency from the transmitter sub-device’s pad, no cap ✨

the link frequency is retrieved using the get_mbus_config sub-device pad operation. if that fails, the function falls back to obtaining the frequency either directly from the V4L2_CID_LINK_FREQ control — if it’s implemented by the transmitter — or by calculating it from the pixel rate obtained from the V4L2_CID_PIXEL_RATE control 💅

🌈 RETURN 🌈

• >0 — link frequency, slay 🔥
• -ENOENT — link frequency or pixel rate control not found 😭
• -EINVAL — invalid link frequency value 💀

👑 SEE ALSO 👑

Kernel file: ./include/media/v4l2-common.h

bestie, if you wanna keep reading, these are the linked girlies 👇

• v4l2_ctrl_query_fill(9)
• enum v4l2_i2c_tuner_type(9)
• v4l2_i2c_new_subdev(9)
• v4l2_i2c_new_subdev_board(9)
• v4l2_i2c_subdev_set_name(9)
• v4l2_i2c_subdev_init(9)
• v4l2_i2c_subdev_addr(9)
• v4l2_i2c_tuner_addrs(9)
• v4l2_i2c_subdev_unregister(9)
• v4l2_spi_new_subdev(9)
• v4l2_spi_subdev_init(9)
• v4l2_spi_subdev_unregister(9)
• v4l_bound_align_image(9)
• v4l2_find_nearest_size_conditional(9)
• v4l2_find_nearest_size(9)
• v4l2_g_parm_cap(9)
• v4l2_s_parm_cap(9)
• enum v4l2_pixel_encoding(9)
• struct v4l2_format_info(9)
• v4l2_get_active_data_lanes(9)
• v4l2_link_freq_to_bitmap(9)
• devm_v4l2_sensor_clk_get(9)
• devm_v4l2_sensor_clk_get_legacy(9)

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that’s the whole vibe, bestie 🫶 this page came from ./include/media, dated October 2026, and tagged v4l2_get_link_freq(9) — periodt ✨💖