[PATCH 2/2] PCI: amlogic: Use PCIe pll gate when available

[Remi Pommarel <repk@triplefau.lt>]

In order to get PCIe working reliably on some AXG platforms, PCIe pll
cml needs to be enabled. This is done by using the PCIE_PLL_CML_ENABLE
clock gate.

This clock gate is optional, so do not fail if it is missing in the
devicetree.

Signed-off-by: Remi Pommarel <repk@triplefau.lt>
---
 drivers/pci/controller/dwc/pci-meson.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 3772b02a5c55..32b70ea9a426 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -89,6 +89,7 @@ struct meson_pcie_clk_res {
 	struct clk *mipi_gate;
 	struct clk *port_clk;
 	struct clk *general_clk;
+	struct clk *pll_cml_gate;
 };
 
 struct meson_pcie_rc_reset {
@@ -300,6 +301,10 @@ static int meson_pcie_probe_clocks(struct meson_pcie *mp)
 	if (IS_ERR(res->clk))
 		return PTR_ERR(res->clk);
 
+	res->pll_cml_gate = meson_pcie_probe_clock(dev, "pll_cml_en", 0);
+	if (IS_ERR(res->pll_cml_gate))
+		res->pll_cml_gate = NULL;
+
 	return 0;
 }
 
-- 
2.24.0