dt-bindings: phy: phy-imx8-pcie: Add binding for the pad modes of imx8 pcie phy

Add binding for reference clock PAD modes of the i.MX8 PCIe PHY.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Tim Harvey <tharvey@gateworks.com>
Tested-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1638432158-4119-2-git-send-email-hongxing.zhu@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Marek Vasut <marex@denx.de> # Pick from Linux f6f787874aa5 ("dt-bindings: phy: phy-imx8-pcie: Add binding for the pad modes of imx8 pcie phy")

diff --git a/include/dt-bindings/phy/phy-imx8-pcie.h b/include/dt-bindings/phy/phy-imx8-pcie.h
new file mode 100644 (file)
index 0000000..8bbe2d6
--- /dev/null
+++ b/include/dt-bindings/phy/phy-imx8-pcie.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * This header provides constants for i.MX8 PCIe.
+ */
+
+#ifndef _DT_BINDINGS_IMX8_PCIE_H
+#define _DT_BINDINGS_IMX8_PCIE_H
+
+/* Reference clock PAD mode */
+#define IMX8_PCIE_REFCLK_PAD_UNUSED    0
+#define IMX8_PCIE_REFCLK_PAD_INPUT     1
+#define IMX8_PCIE_REFCLK_PAD_OUTPUT    2
+
+#endif /* _DT_BINDINGS_IMX8_PCIE_H */