TC358743/9 settings for non-standard HDMI mode - where to find info?

Hi,
I need to calculate settings for a non-standard video mode in HDMI-CSI2 bridges TC358743/TC358749 to be used in my embedded system,
In the Linux drivers: https://github.com/armbian/linux/blob/rockchip/drivers/media/i2c/tc35874x.c
https://elixir.bootlin.com/linux/latest/source/drivers/media/i2c/tc358743.c

I can find:
/*
 * References (c = chapter, p = page):
 * REF_01 - Toshiba, TC358743XBG (H2C), Functional Specification, Rev 0.60
 * REF_02 - Toshiba, TC358743XBG_HDMI-CSI_Tv11p_nm.xls
 */

However, I couldn't find the referenced Toshiba documents neither in their website, nor anywhere in the net.
Could somebody help me to find the necessary documentation for TC358743/9?

TIA & Regards,
Wojtek

PS. I have found https://patchwork.kernel.org/patch/9958973/ , but it gives just the new values for another mode. Does not give hints how those values are calculated.