PCI: imx6: Add Refclk for i.MX95 PCIe

Add "ref" clock to enable Refclk. To avoid breaking DT backwards
compatibility, the i.MX95 "ref" clock is optional. Use
devm_clk_get_optional() to fetch i.MX95 PCIe optional clocks in driver.

If using external clock, "ref" clock should point to external reference.

If using internal clock, CREF_EN in LAST_TO_REG controls reference output,
implemented in drivers/clk/imx/clk-imx95-blk-ctl.c.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Richard Zhu <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Frank Li <[email protected]>

0 files changed, 0 insertions, 0 deletions