On RK3588 the GPU clk is exposed using a normal CLK_GPU and also as
SCMI_CLK_GPU. The main clock for the GPU is the SCMI_CLK_GPU, however,
the normal CLK_GPU also need to be enabled independently.

Add support for a bus clk to handle these two different clocks, similar
to panfrost.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>

CLK_GPU is the main clock for the GPU on RK3588, it's typical source
pll can be one of gpll, cpll, aupll, npll or spll. For higher clock
rates it is also possible to use the gpu pvtpll as pll source.

The logic to switch between a normal pll and the pvtpll depending on
rate is handled in TF-A firmware, and exposed to Linux as a scmi clock.
TF-A will typically change to use normal pll for rates up to 200 MHz and
use pvtpll for 300 MHz or more.

Change to use the SCMI_CLK_GPU as the main GPU clock and add the normal
CLK_GPU as a bus clk to model this in a similar way as on RK356x.

Prior to this change the GPU clk rate was max 850 MHz:

  $ glmark2-es2-gbm -b terrain
  [...]
    GL_VENDOR:      Mesa
    GL_RENDERER:    Mali-G610 (Panfrost)
    GL_VERSION:     OpenGL ES 3.1 Mesa 25.0.4
    Surface Config: buf=32 r=8 g=8 b=8 a=8 depth=24 stencil=0 samples=0
    Surface Size:   800x600 fullscreen
  [...]
  [terrain] <default>: FPS: 139 FrameTime: 7.231 ms

After this the GPU clk rate can use the 1 GHz rate with PVTPLL:

  [terrain] <default>: FPS: 152 FrameTime: 6.579 ms

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>

On Rockchip RK3588 trying to change the SCMI_CLK_GPU rate when the GPU
device is PM runtime suspended may cause a kernel panic:

  $ echo 1000000000 > /sys/class/devfreq/fb000000.gpu/min_freq

  SError Interrupt on CPU4, code 0x00000000be000411 -- SError
  CPU: 4 UID: 0 PID: 241 Comm: sh Not tainted 6.15.0-rc3 armbian#1 VOLUNTARY
  Hardware name: Radxa ROCK 5B (DT)
  pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
  pc : smc_send_message+0x140/0x148
  lr : smc_send_message+0xd8/0x148
  sp : ffff8000827138c0
  x29: ffff8000827138c0 x28: ffff000008764000 x27: 0000000000000000
  x26: 0000000000000000 x25: 00000000ffffffff x24: ffff800082713b28
  x23: ffff00000696b010 x22: ffff000003db4da0 x21: ffff000003fdae80
  x20: ffff0000053f22c0 x19: ffff000003db4d80 x18: 0000000000000000
  x17: 0000000000000000 x16: 0000000000000000 x15: 00000000245df550
  x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
  x11: 0000000000000040 x10: ffff000003fde138 x9 : ffff000003fde130
  x8 : ffff000005e5c948 x7 : 0000000000000000 x6 : 0000000000000000
  x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
  x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
  Kernel panic - not syncing: Asynchronous SError Interrupt
  CPU: 4 UID: 0 PID: 241 Comm: sh Not tainted 6.15.0-rc3 armbian#1 VOLUNTARY
  Hardware name: Radxa ROCK 5B (DT)
  Call trace:
   show_stack+0x28/0x78 (C)
   dump_stack_lvl+0x58/0x74
   dump_stack+0x14/0x1c
   panic+0x14c/0x328
   add_taint+0x0/0xc0
   arm64_serror_panic+0x60/0x6c
   do_serror+0x24/0x60
   el1h_64_error_handler+0x2c/0x40
   el1h_64_error+0x6c/0x70
   smc_send_message+0x140/0x148 (P)
   do_xfer+0xb0/0x1f8
   scmi_clock_rate_set+0xc0/0x220
   scmi_clk_set_rate+0x24/0x38
   clk_change_rate+0x164/0x288
   clk_core_set_rate_nolock+0x1dc/0x314
   clk_set_rate+0x34/0x144
   _opp_config_clk_single+0x2c/0x90
   _set_opp+0x104/0x564
   dev_pm_opp_set_rate+0x110/0x260
   panthor_devfreq_target+0x38/0x60 [panthor]
   devfreq_set_target+0x84/0x180
   devfreq_update_target+0xb4/0xcc
   update_devfreq+0x10/0x18
   set_freq_store+0x6c/0xb4
   dev_attr_store+0x14/0x24
   sysfs_kf_write+0x54/0x60
   kernfs_fop_write_iter+0x118/0x1e0
   vfs_write+0x224/0x390
   ksys_write+0x68/0x100
   __arm64_sys_write+0x18/0x20
   invoke_syscall+0x44/0x100
   el0_svc_common.constprop.0+0x3c/0xe0
   do_el0_svc+0x18/0x20
   el0_svc+0x2c/0xc0
   el0t_64_sync_handler+0x104/0x130
   el0t_64_sync+0x170/0x174
  SMP: stopping secondary CPUs
  Kernel Offset: disabled
  CPU features: 0x0e00,000000e0,01202650,8201700b
  Memory Limit: 3838 MB
  ---[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]---

This typically happen when CLK_GPU is disabled or when PD_GPU is down.

Add a config_clks ops that will not set core clk rate when the device is
PM runtime suspended.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>