phy: socionext: Add UniPhier PCIe PHY driver

Add PCIe PHY driver support for Pro5, LD20 and PXs3 SoCs.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
diff --git a/drivers/phy/socionext/Kconfig b/drivers/phy/socionext/Kconfig
new file mode 100644
index 0000000..bcd579e
--- /dev/null
+++ b/drivers/phy/socionext/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PHY drivers for Socionext platforms.
+#
+
+config PHY_UNIPHIER_PCIE
+	bool "UniPhier PCIe PHY driver"
+	depends on PHY && ARCH_UNIPHIER
+	imply REGMAP
+	help
+	  Enable this to support PHY implemented in PCIe controller
+	  on UniPhier SoCs.