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rockchip64: add low-resolution HDMI clocks (RFC) - #11068

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RiPetitor:eltay/rk356x-hdmi-low-resolution
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Follow-up to #11067 for additional standard HDMI modes.

Pixel clock, MHz Modes
25.175 / 25.2 640x480 at 59.94 / 60 Hz
36 640x480 at 85 Hz, 800x600 at 56 Hz
40 800x600 at 60 Hz
49.5 800x600 at 75 Hz
65 1024x768 at 60 Hz

Use a private HPLL table to keep fractional rates away from NPLL and VPLL.
Retain existing rates and the tested 31.5 MHz setting.

Calculations, patch application and the ARM64 driver build pass.
The additional modes are not hardware-tested.

Please review the PLL settings and whether a separate HPLL table is appropriate.
Hardware test results on RK3566 and RK3568 are welcome.

Add a private HPLL table for VGA, SVGA and XGA pixel clocks.
Keep fractional settings separate from NPLL and VPLL.

The additional modes need hardware testing.
@github-actions github-actions Bot added 11 Milestone: Fourth quarter release size/medium PR with more then 50 and less then 250 lines Needs review Seeking for review Hardware Hardware related like kernel, U-Boot, ... Patches Patches related to kernel, U-Boot, ... labels Oct 21, 2026
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11 Milestone: Fourth quarter release Hardware Hardware related like kernel, U-Boot, ... Needs review Seeking for review Patches Patches related to kernel, U-Boot, ... size/medium PR with more then 50 and less then 250 lines

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