[PATCH v3 2/5] phy: core: Define TBT phy_mode

[Konrad Dybcio <konradybcio@kernel.org>]

From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

There exist OS-accessible USB4 and Thunderbolt PHYs that need specific
configuration. Define a new phy_mode for them.

Currently, USB4 and TBT3 are defined as submodes, because they're quite
distinct, most visibly in the electrical/analog aspects (slightly
different frequencies, timings, etc.). This results in a need to make
the PHY aware of the actual mode needed (at least in the Qualcomm
implementation, but I believe that'll be a general need).

Newer versions of TBT are basically supersets of USB4 with higher
host-side requirements, so these are not defined. This can always be
changed as necessary.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
---
 include/linux/phy/phy-tbt.h | 14 ++++++++++++++
 include/linux/phy/phy.h     |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/phy/phy-tbt.h b/include/linux/phy/phy-tbt.h
new file mode 100644
index 000000000000..5f48059814e1
--- /dev/null
+++ b/include/linux/phy/phy-tbt.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+#ifndef __PHY_TBT_H_
+#define __PHY_TBT_H_
+
+enum tbt_phy_submode {
+	PHY_SUBMODE_TBT3,
+	PHY_SUBMODE_USB4,
+};
+
+#endif
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index ea47975e288a..26a91c070f8c 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -20,6 +20,7 @@
 #include <linux/phy/phy-hdmi.h>
 #include <linux/phy/phy-lvds.h>
 #include <linux/phy/phy-mipi-dphy.h>
+#include <linux/phy/phy-tbt.h>
 
 struct phy;
 
@@ -45,6 +46,7 @@ enum phy_mode {
 	PHY_MODE_LVDS,
 	PHY_MODE_DP,
 	PHY_MODE_HDMI,
+	PHY_MODE_TBT,
 };
 
 enum phy_media {

-- 
2.55.0