netdev - [PATCH 1/2] Docs/devicetree: add serdes-output-amplitude to marvell.txt

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Message-Id: <20211126154249.2958-1-holger.brunck@hitachienergy.com>
Date:   Fri, 26 Nov 2021 16:42:48 +0100
From:   Holger Brunck <holger.brunck@...achienergy.com>
To:     netdev@...r.kernel.org
Cc:     Holger Brunck <holger.brunck@...achienergy.com>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 1/2] Docs/devicetree: add serdes-output-amplitude to marvell.txt

This can be configured from the device tree. Add this property to the
documentation accordingly.
The eight different values added in the dt-bindings file correspond to
the values we can configure on 88E6352, 88E6240 and 88E6176 switches
according to the datasheet.

CC: Andrew Lunn <andrew@...n.ch>
CC: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Holger Brunck <holger.brunck@...achienergy.com>
---
 .../devicetree/bindings/net/dsa/marvell.txt    |  3 +++
 include/dt-bindings/net/mv-88e6xxx.h           | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 include/dt-bindings/net/mv-88e6xxx.h

diff --git a/Documentation/devicetree/bindings/net/dsa/marvell.txt b/Documentation/devicetree/bindings/net/dsa/marvell.txt
index 2363b412410c..bff397a2dc49 100644
--- a/Documentation/devicetree/bindings/net/dsa/marvell.txt
+++ b/Documentation/devicetree/bindings/net/dsa/marvell.txt
@@ -46,6 +46,9 @@ Optional properties:
 - mdio?		: Container of PHYs and devices on the external MDIO
 			  bus. The node must contains a compatible string of
 			  "marvell,mv88e6xxx-mdio-external"
+- serdes-output-amplitude: Configure the output amplitude of the serdes
+			   interface.
+    serdes-output-amplitude = <MV88E6352_SERDES_OUT_AMP_210MV>;
 
 Example:
 
diff --git a/include/dt-bindings/net/mv-88e6xxx.h b/include/dt-bindings/net/mv-88e6xxx.h
new file mode 100644
index 000000000000..9bc6decaee83
--- /dev/null
+++ b/include/dt-bindings/net/mv-88e6xxx.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Device Tree constants for the Marvell 88E6XXX switch devices
+ */
+
+#ifndef _DT_BINDINGS_MV_88E6XXX_H
+#define _DT_BINDINGS_MV_88E6XXX_H
+
+#define MV88E6352_SERDES_OUT_AMP_14MV		0x0
+#define MV88E6352_SERDES_OUT_AMP_112MV		0x1
+#define MV88E6352_SERDES_OUT_AMP_210MV		0x2
+#define MV88E6352_SERDES_OUT_AMP_308MV		0x3
+#define MV88E6352_SERDES_OUT_AMP_406MV		0x4
+#define MV88E6352_SERDES_OUT_AMP_504MV		0x5
+#define MV88E6352_SERDES_OUT_AMP_602MV		0x6
+#define MV88E6352_SERDES_OUT_AMP_700MV		0x7
+
+#endif
-- 
2.34.0