[PATCH v2 0/2] clk: add gated-fixed-clock driver for rk3588-rock-5-itx PCIe

[Daniele Briguglio]

v1 [1] was a board-local dtsi override that dropped the
gated-fixed-clock refclks from pcie3x4 and pcie3x2 on
rk3588-rock-5-itx.

Jonas pointed out that the u-boot dtsi is propagated to the OS via
EFI handoff, making the dtsi-override approach brittle.  This v2
adds a UCLASS_CLK driver for the "gated-fixed-clock" binding
instead.

Changes since v1:
  - drop the dtsi override
  - add a UCLASS_CLK driver for "gated-fixed-clock" (Jonas)
  - enable CONFIG_CLK_GATED_FIXED in the rock-5-itx defconfig

Testing:
  Validated end-to-end on a NanoPC T6 LTS via the synthetic-DT
  approach Jonas suggested: a fake "gated-fixed-clock" node with a
  fake "regulator-fixed" supply injected into the board's u-boot
  dtsi and wired as an additional "ref" clock of pcie3x4.  Probe
  and enable trigger when pcie_dw_rockchip runs clk_enable_bulk,
  and NVMe enumerates through the synthetic refclk path.

  I don't have free access to a rock-5-itx at the moment (the one I
  maintain serves a production mirror), so the v2 has been
  build-tested only on the real target.

[1] https://lore.kernel.org/u-boot/20260518-rock-5-itx-pcie-refclk-dtsi-v1-1-faf8626039fc@superkali.me/

Signed-off-by: Daniele Briguglio <hello at superkali.me>
---
Daniele Briguglio (2):
      clk: add gated-fixed-clock driver
      configs: rock-5-itx-rk3588: enable CLK_GATED_FIXED

 configs/rock-5-itx-rk3588_defconfig |  1 +
 drivers/clk/Kconfig                 |  9 ++++
 drivers/clk/Makefile                |  1 +
 drivers/clk/clk-gated-fixed.c       | 84 +++++++++++++++++++++++++++++++++++++
 4 files changed, 95 insertions(+)
---
base-commit: 38dbe637c9dfcadbd1bc201bfbb27f96b2ad525a
change-id: 20260518-rock-5-itx-pcie-refclk-dtsi-17ad4b21df1d

Best regards,
--  
Daniele Briguglio <hello at superkali.me>