Re: [PATCH v3] arm64: dts: rockchip: rock-3b: Model PI6C20100 as gated-fixed-clock

[Krzysztof Kozlowski <krzk@kernel.org>]

On 19/03/2026 11:22, MidG971 wrote:
> The Radxa ROCK 3B uses a PI6C20100 PCIe reference clock buffer to
> provide a 100MHz reference clock to the PCIe 3.0 PHY and controllers.
> This chip is currently modeled only as a fixed regulator
> (vcc3v3_pi6c_03), with no clock output representation.
> 
> The PI6C20100 is a clock generator, not a power supply. Model it
> properly as a gated-fixed-clock, following the pattern established
> for the Rock 5 ITX and other boards with similar PCIe clock buffer
> chips.
> 
> The regulator node is kept as-is since it controls the power supply
> to the PI6C20100 chip via GPIO0_D4. The new gated-fixed-clock node
> references this regulator as its vdd-supply and provides a proper
> 100MHz clock output. The pcie3x2 node is updated to include the
> pipe and reference clocks, matching the approach used in
> rk3588-rock-5-itx.dts.
> 
> Assisted-by: Claude:claude-3-opus
> Signed-off-by: MidG971 <midgy971@gmail.com>

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Best regards,
Krzysztof