clk/bcm2835: Allow use of PLLC as a parent on 2711#7259
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6by9 merged 1 commit intoraspberrypi:rpi-6.12.yfrom Mar 10, 2026
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clk/bcm2835: Allow use of PLLC as a parent on 2711#72596by9 merged 1 commit intoraspberrypi:rpi-6.12.yfrom
6by9 merged 1 commit intoraspberrypi:rpi-6.12.yfrom
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Checked that this still blocks PLLC on BCM283x, and it does. |
pelwell
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Mar 10, 2026
BCM2711 fixes PLLC, so there's no need to avoid it. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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kernel: clk/bcm2835: Allow use of PLLC as a parent on 2711 See: raspberrypi/linux#7259
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kernel: clk/bcm2835: Allow use of PLLC as a parent on 2711 See: raspberrypi/linux#7259
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DPI being a pixel clock needs to be fairly accurate. BCM2711 has changed the oscillator from 19.2MHz to 54MHz, so the current clock manager code thinks that for eg a 32MHz pixel clock it can use the oscillator and a fractional divider. For many displays this isn't acceptable.
Add a new option for clock parentage that doesn't permit the oscillator, and use this option for the DPI clock.
#7126
Wants testing on their hardware before merge, hence draft.