clk: imx7ulp: make it easy to change ARM core clk

ARM clk could only source from divcore or hsrun_divcore.

Follow what we already used on i.MX7D and i.MX8M SoCs, use
imx_clk_hw_cpu API. When ARM core is running normaly,
whether divcore or hwrun_divcore will finally source
from SPLL_PFD0. However SPLL_PFD0 is marked with CLK_SET_GATE,
so we need to disable SPLL_PFD0, when configure the rate.
So add CORE and HSRUN_CORE virtual clk to make it easy to
configure the clk using imx_clk_hw_cpu API.

Since CORE and HSRUN_CORE already marked with CLK_IS_CRITICAL, no
need to set ARM as CLK_IS_CRITICAL. And when set the rate of ARM clk,
prograting it the parent with CLK_SET_RATE_PARENT will finally set
the SPLL_PFD0 clk.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

clk: imx7ulp: do not export out IMX7ULP_CLK_MIPI_PLL clock

The mipi pll clock comes from the MIPI PHY PLL output, so
it should not be a fixed clock.

MIPI PHY PLL is in the MIPI DSI space, and it is used as
the bit clock for transferring the pixel data out and its
output clock is configured according to the display mode.

So it should be used only for MIPI DSI and not be exported
out for other usages.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

dt-bindings: clock: imx7ulp: remove SNVS clock

Since i.MX7ULP B0 chip, SNVS module is moved into M4
domain, so remove it from Linux clock table.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

dt-bindings: clock: imx7ulp: add HSRUN mode related clocks

There are HSRUN mode clock mux and divider in SCG1 module,
and SMC1 can control i.MX7ULP CPU to run in RUN mode or
HSRUN mode, the mode switch bits are actually a clock mux,
add these clocks for clock driver and dtb to use.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

dt-bindings: clock: add imx7ulp clock binding doc

i.MX7ULP Clock functions are under joint control of the System
Clock Generation (SCG) modules, Peripheral Clock Control (PCC)
modules, and Core Mode Controller (CMC)1 blocks

Note IMX7ULP has two clock domains: M4 and A7. This binding doc
is only for A7 clock domain.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Anson Huang <Anson.Huang@nxp.com>
Cc: Bai Ping <ping.bai@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>