linux-kernel - [RESEND PATCH v1 01/15] phy: Add DisplayPort configuration options

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Message-ID: <1576069760-11473-2-git-send-email-yamonkar@cadence.com>
Date:   Wed, 11 Dec 2019 14:09:06 +0100
From:   Yuti Amonkar <yamonkar@...ence.com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <kishon@...com>, <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <jsarha@...com>, <tomi.valkeinen@...com>, <praneeth@...com>,
        <mparab@...ence.com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>
Subject: [RESEND PATCH v1 01/15] phy: Add DisplayPort configuration options

Add generic DP API for configuring DisplayPort PHYs. The parameters
that will be configured are link rate, number of lanes, voltage swing
and pre-emphasis.

Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
---
 include/linux/phy/phy-dp.h | 95 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/phy/phy.h    |  4 ++
 2 files changed, 99 insertions(+)
 create mode 100644 include/linux/phy/phy-dp.h

diff --git a/include/linux/phy/phy-dp.h b/include/linux/phy/phy-dp.h
new file mode 100644
index 0000000..18cad23
--- /dev/null
+++ b/include/linux/phy/phy-dp.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 Cadence Design Systems Inc.
+ */
+
+#ifndef __PHY_DP_H_
+#define __PHY_DP_H_
+
+#include <linux/types.h>
+
+/**
+ * struct phy_configure_opts_dp - DisplayPort PHY configuration set
+ *
+ * This structure is used to represent the configuration state of a
+ * DisplayPort phy.
+ */
+struct phy_configure_opts_dp {
+	/**
+	 * @link_rate:
+	 *
+	 * Link Rate, in Mb/s, of the main link.
+	 *
+	 * Allowed values: 1620, 2160, 2430, 2700, 3240, 4320, 5400, 8100 Mb/s
+	 */
+	unsigned int link_rate;
+
+	/**
+	 * @lanes:
+	 *
+	 * Number of active, consecutive, data lanes, starting from
+	 * lane 0, used for the transmissions on main link.
+	 *
+	 * Allowed values: 1, 2, 4
+	 */
+	unsigned int lanes;
+
+	/**
+	 * @voltage:
+	 *
+	 * Voltage swing levels, as specified by DisplayPort specification,
+	 * to be used by particular lanes. One value per lane.
+	 * voltage[0] is for lane 0, voltage[1] is for lane 1, etc.
+	 *
+	 * Maximum value: 3
+	 */
+	unsigned int voltage[4];
+
+	/**
+	 * @pre:
+	 *
+	 * Pre-emphasis levels, as specified by DisplayPort specification, to be
+	 * used by particular lanes. One value per lane.
+	 *
+	 * Maximum value: 3
+	 */
+	unsigned int pre[4];
+
+	/**
+	 * @ssc:
+	 *
+	 * Flag indicating, whether or not to enable spread-spectrum clocking.
+	 *
+	 */
+	u8 ssc : 1;
+
+	/**
+	 * @set_rate:
+	 *
+	 * Flag indicating, whether or not reconfigure link rate and SSC to
+	 * requested values.
+	 *
+	 */
+	u8 set_rate : 1;
+
+	/**
+	 * @set_lanes:
+	 *
+	 * Flag indicating, whether or not reconfigure lane count to
+	 * requested value.
+	 *
+	 */
+	u8 set_lanes : 1;
+
+	/**
+	 * @set_voltages:
+	 *
+	 * Flag indicating, whether or not reconfigure voltage swing
+	 * and pre-emphasis to requested values. Only lanes specified
+	 * by "lanes" parameter will be affected.
+	 *
+	 */
+	u8 set_voltages : 1;
+};
+
+#endif /* __PHY_DP_H_ */
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 15032f14..ba0aab5 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -16,6 +16,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 
+#include <linux/phy/phy-dp.h>
 #include <linux/phy/phy-mipi-dphy.h>
 
 struct phy;
@@ -46,9 +47,12 @@ enum phy_mode {
  *
  * @mipi_dphy:	Configuration set applicable for phys supporting
  *		the MIPI_DPHY phy mode.
+ * @dp:		Configuration set applicable for phys supporting
+ *		the DisplayPort protocol.
  */
 union phy_configure_opts {
 	struct phy_configure_opts_mipi_dphy	mipi_dphy;
+	struct phy_configure_opts_dp		dp;
 };
 
 /**
-- 
2.7.4