linux-kernel - [PATCH v6 4/8] phy: Add HDMI configuration options

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Message-Id: <cec469206a166c4b070fd7d7bbf89a8df656ccc6.1686729444.git.Sandor.yu@nxp.com>
Date:   Thu, 15 Jun 2023 09:38:14 +0800
From:   Sandor Yu <Sandor.yu@....com>
To:     andrzej.hajda@...el.com, neil.armstrong@...aro.org,
        robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com, vkoul@...nel.org,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org
Cc:     kernel@...gutronix.de, linux-imx@....com, Sandor.yu@....com,
        oliver.brown@....com
Subject: [PATCH v6 4/8] phy: Add HDMI configuration options

Allow HDMI PHYs to be configured through the generic
functions through a custom structure added to the generic union.

The parameters added here are based on HDMI PHY
implementation practices.  The current set of parameters
should cover the potential users.

Signed-off-by: Sandor Yu <Sandor.yu@....com>
---
 include/linux/phy/phy-hdmi.h | 38 ++++++++++++++++++++++++++++++++++++
 include/linux/phy/phy.h      |  7 ++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/phy/phy-hdmi.h

diff --git a/include/linux/phy/phy-hdmi.h b/include/linux/phy/phy-hdmi.h
new file mode 100644
index 000000000000..5765aa5bc175
--- /dev/null
+++ b/include/linux/phy/phy-hdmi.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2022 NXP
+ */
+
+#ifndef __PHY_HDMI_H_
+#define __PHY_HDMI_H_
+
+/**
+ * Pixel Encoding as HDMI Specification
+ * RGB, YUV422, YUV444:HDMI Specification 1.4a Section 6.5
+ * YUV420: HDMI Specification 2.a Section 7.1
+ */
+enum hdmi_phy_colorspace {
+	HDMI_PHY_COLORSPACE_RGB,        /* RGB 4:4:4 */
+	HDMI_PHY_COLORSPACE_YUV422,     /* YCbCr 4:2:2 */
+	HDMI_PHY_COLORSPACE_YUV444,     /* YCbCr 4:4:4 */
+	HDMI_PHY_COLORSPACE_YUV420,     /* YCbCr 4:2:0 */
+	HDMI_PHY_COLORSPACE_RESERVED4,
+	HDMI_PHY_COLORSPACE_RESERVED5,
+	HDMI_PHY_COLORSPACE_RESERVED6,
+};
+
+/**
+ * struct phy_configure_opts_hdmi - HDMI configuration set
+ * @pixel_clk_rate:	Pixel clock of video modes in KHz.
+ * @bpc: Maximum bits per color channel.
+ * @color_space: Colorspace in enum hdmi_phy_colorspace.
+ *
+ * This structure is used to represent the configuration state of a HDMI phy.
+ */
+struct phy_configure_opts_hdmi {
+	unsigned int pixel_clk_rate;
+	unsigned int bpc;
+	enum hdmi_phy_colorspace color_space;
+};
+
+#endif /* __PHY_HDMI_H_ */
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 3a570bc59fc7..93d77d45b1d4 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -17,6 +17,7 @@
 #include <linux/regulator/consumer.h>
 
 #include <linux/phy/phy-dp.h>
+#include <linux/phy/phy-hdmi.h>
 #include <linux/phy/phy-lvds.h>
 #include <linux/phy/phy-mipi-dphy.h>
 
@@ -42,7 +43,8 @@ enum phy_mode {
 	PHY_MODE_MIPI_DPHY,
 	PHY_MODE_SATA,
 	PHY_MODE_LVDS,
-	PHY_MODE_DP
+	PHY_MODE_DP,
+	PHY_MODE_HDMI,
 };
 
 enum phy_media {
@@ -60,11 +62,14 @@ enum phy_media {
  *		the DisplayPort protocol.
  * @lvds:	Configuration set applicable for phys supporting
  *		the LVDS phy mode.
+ * @hdmi:	Configuration set applicable for phys supporting
+ *		the HDMI phy mode.
  */
 union phy_configure_opts {
 	struct phy_configure_opts_mipi_dphy	mipi_dphy;
 	struct phy_configure_opts_dp		dp;
 	struct phy_configure_opts_lvds		lvds;
+	struct phy_configure_opts_hdmi		hdmi;
 };
 
 /**
-- 
2.34.1