rockchip: clk: add GATE_LINK support

Hi,

This implements proper GATE_LINK support following the suggestion from Stephen
Boyd to use clk PM operations by creating MFD dynamically. This required some
restructuring, since CLK_OF_DECLARE() is called before devices are available.

Apart from improved power consumption, this fixes the runtime errors from the
pmdomain driver (failed to set idle on domain '%s'). Last but not least it is
a first step towards reducing usage of CLK_OF_DECLARE_DRIVER() registered
clocks, which should only be used for early clocks needed for the system
timer (see this talk from LPC: https://www.youtube.com/watch?v=dofbbVuIAPk ).

Changes since PATCHv11:
 * https://lore.kernel.org/all/20241024181621.210509-1-sebas...
 * rebase to v6.13-rc1 based for-next branch from Heiko
   - no changes needed, so v12 is more or less a resend of v11

Changes since PATCHv10:
 * https://lore.kernel.org/linux-rockchip/20240913184720.573...
 * rebased to v6.12-rc1
 * make struct platform_driver static

Changes since PATCHv9:
 * https://lore.kernel.org/linux-rockchip/20240325193609.237...
 * drop patches 1 & 5 (merged)
 * keep reporting ENOENT for missing clocks after CRU has been fully initialized
 * drop module remove support for the linked gate clock driver

Changes since PATCHv8:
 * https://lore.kernel.org/linux-rockchip/20240126182919.484...
 * rebased to v6.9-rc1
 * dropped all merged patches (i.e. all but the last one)
 * rewrote and split the final patch
   - should be easier to review
   - properly calls pm_clk_suspend/pm_clk_resume
   - now works on Orange Pi

Changes since PATCHv7:
 * https://lore.kernel.org/all/20231213185114.47565-1-sebast...
 * rebased to v6.8-rc1
 * Collected Reviewed-by/Acked-by from Krzysztof Kozlowski for DT binding patches
 * support nr_clk=0 in rockchip_clk_find_max_clk_id() for smatch

Greetings,

-- Sebstian

Sebastian Reichel (5):
  clk: rockchip: support clocks registered late
  clk: rockchip: rk3588: register GATE_LINK later
  clk: rockchip: expose rockchip_clk_set_lookup
  clk: rockchip: implement linked gate clock support
  clk: rockchip: rk3588: drop RK3588_LINKED_CLK

 drivers/clk/rockchip/Makefile     |   1 +
 drivers/clk/rockchip/clk-rk3588.c | 116 ++++++++++++++++++------------
 drivers/clk/rockchip/clk.c        | 101 ++++++++++++++++++++++----
 drivers/clk/rockchip/clk.h        |  40 +++++++++++
 drivers/clk/rockchip/gate-link.c  |  85 ++++++++++++++++++++++
 5 files changed, 285 insertions(+), 58 deletions(-)
 create mode 100644 drivers/clk/rockchip/gate-link.c

-- 
2.45.2