[PATCH v3 13/32] drm/exynos: hdmi: remove the i2c drivers and use devtree

[Sean Paul <seanpaul@chromium.org>]

From: Daniel Kurtz <djkurtz@chromium.org>

The i2c client was previously being passed into the hdmi driver via a
dedicated i2c driver, and then a global variable. This patch removes all
of that and just uses the device tree to get the i2c_client. This patch
also properly references the client so we don't lose it before we're
done with it.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---

Changes in v2:
	- Change include to linux/i2c.h instead of linux/of_i2c.h
Changes in v3: None

 drivers/gpu/drm/exynos/Makefile         |  1 -
 drivers/gpu/drm/exynos/exynos_ddc.c     | 63 --------------------------------
 drivers/gpu/drm/exynos/exynos_hdmi.c    | 59 ++++++++++++++----------------
 drivers/gpu/drm/exynos/exynos_hdmi.h    | 23 ------------
 drivers/gpu/drm/exynos/exynos_hdmiphy.c | 65 ---------------------------------
 5 files changed, 27 insertions(+), 184 deletions(-)
 delete mode 100644 drivers/gpu/drm/exynos/exynos_ddc.c
 delete mode 100644 drivers/gpu/drm/exynos/exynos_hdmi.h
 delete mode 100644 drivers/gpu/drm/exynos/exynos_hdmiphy.c

diff --git a/drivers/gpu/drm/exynos/Makefile b/drivers/gpu/drm/exynos/Makefile
index 639b49e..819961a 100644
--- a/drivers/gpu/drm/exynos/Makefile
+++ b/drivers/gpu/drm/exynos/Makefile
@@ -12,7 +12,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_IOMMU) += exynos_drm_iommu.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_DMABUF) += exynos_drm_dmabuf.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_FIMD)	+= exynos_drm_fimd.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_HDMI)	+= exynos_hdmi.o exynos_mixer.o \
-					   exynos_ddc.o exynos_hdmiphy.o \
 					   exynos_drm_hdmi.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_VIDI)	+= exynos_drm_vidi.o
 exynosdrm-$(CONFIG_DRM_EXYNOS_G2D)	+= exynos_drm_g2d.o
diff --git a/drivers/gpu/drm/exynos/exynos_ddc.c b/drivers/gpu/drm/exynos/exynos_ddc.c
deleted file mode 100644
index 6a8c84e..0000000
--- a/drivers/gpu/drm/exynos/exynos_ddc.c
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright (C) 2011 Samsung Electronics Co.Ltd
- * Authors:
- *	Seung-Woo Kim <sw0312.kim@samsung.com>
- *	Inki Dae <inki.dae@samsung.com>
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- *
- */
-
-#include <drm/drmP.h>
-
-#include <linux/kernel.h>
-#include <linux/i2c.h>
-#include <linux/of.h>
-
-#include "exynos_drm_drv.h"
-#include "exynos_hdmi.h"
-
-static int s5p_ddc_probe(struct i2c_client *client,
-			const struct i2c_device_id *dev_id)
-{
-	hdmi_attach_ddc_client(client);
-
-	dev_info(&client->adapter->dev,
-		"attached %s into i2c adapter successfully\n",
-		client->name);
-
-	return 0;
-}
-
-static int s5p_ddc_remove(struct i2c_client *client)
-{
-	dev_info(&client->adapter->dev,
-		"detached %s from i2c adapter successfully\n",
-		client->name);
-
-	return 0;
-}
-
-static struct of_device_id hdmiddc_match_types[] = {
-	{
-		.compatible = "samsung,exynos5-hdmiddc",
-	}, {
-		.compatible = "samsung,exynos4210-hdmiddc",
-	}, {
-		/* end node */
-	}
-};
-
-struct i2c_driver ddc_driver = {
-	.driver = {
-		.name = "exynos-hdmiddc",
-		.owner = THIS_MODULE,
-		.of_match_table = hdmiddc_match_types,
-	},
-	.probe		= s5p_ddc_probe,
-	.remove		= s5p_ddc_remove,
-	.command		= NULL,
-};
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index d35ab2a..e106309 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -33,6 +33,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/io.h>
 #include <linux/of.h>
+#include <linux/i2c.h>
 #include <linux/of_gpio.h>
 
 #include <drm/exynos_drm.h>
@@ -40,8 +41,6 @@
 #include "exynos_drm_drv.h"
 #include "exynos_drm_hdmi.h"
 
-#include "exynos_hdmi.h"
-
 #include <linux/gpio.h>
 #include <media/s5p_hdmi.h>
 
@@ -1849,20 +1848,6 @@ fail:
 	return -ENODEV;
 }
 
-static struct i2c_client *hdmi_ddc, *hdmi_hdmiphy;
-
-void hdmi_attach_ddc_client(struct i2c_client *ddc)
-{
-	if (ddc)
-		hdmi_ddc = ddc;
-}
-
-void hdmi_attach_hdmiphy_client(struct i2c_client *hdmiphy)
-{
-	if (hdmiphy)
-		hdmi_hdmiphy = hdmiphy;
-}
-
 static struct s5p_hdmi_platform_data *drm_hdmi_dt_parse_pdata
 					(struct device *dev)
 {
@@ -1907,6 +1892,7 @@ static int hdmi_probe(struct platform_device *pdev)
 	struct s5p_hdmi_platform_data *pdata;
 	struct resource *res;
 	const struct of_device_id *match;
+	struct device_node *ddc_node, *phy_node;
 	int ret;
 
 	 if (!dev->of_node)
@@ -1957,21 +1943,30 @@ static int hdmi_probe(struct platform_device *pdev)
 	}
 
 	/* DDC i2c driver */
-	if (i2c_add_driver(&ddc_driver)) {
-		DRM_ERROR("failed to register ddc i2c driver\n");
-		return -ENOENT;
+	ddc_node = of_find_node_by_name(NULL, "hdmiddc");
+	if (!ddc_node) {
+		DRM_ERROR("Failed to find ddc node in device tree\n");
+		return -ENODEV;
+	}
+	hdata->ddc_port = of_find_i2c_device_by_node(ddc_node);
+	if (!hdata->ddc_port) {
+		DRM_ERROR("Failed to get ddc i2c client by node\n");
+		return -ENODEV;
 	}
-
-	hdata->ddc_port = hdmi_ddc;
 
 	/* hdmiphy i2c driver */
-	if (i2c_add_driver(&hdmiphy_driver)) {
-		DRM_ERROR("failed to register hdmiphy i2c driver\n");
-		ret = -ENOENT;
+	phy_node = of_find_node_by_name(NULL, "hdmiphy");
+	if (!phy_node) {
+		DRM_ERROR("Failed to find hdmiphy node in device tree\n");
+		ret = -ENODEV;
+		goto err_ddc;
+	}
+	hdata->hdmiphy_port = of_find_i2c_device_by_node(phy_node);
+	if (!hdata->hdmiphy_port) {
+		DRM_ERROR("Failed to get hdmi phy i2c client from node\n");
+		ret = -ENODEV;
 		goto err_ddc;
 	}
-
-	hdata->hdmiphy_port = hdmi_hdmiphy;
 
 	hdata->irq = gpio_to_irq(hdata->hpd_gpio);
 	if (hdata->irq < 0) {
@@ -2002,22 +1997,22 @@ static int hdmi_probe(struct platform_device *pdev)
 	return 0;
 
 err_hdmiphy:
-	i2c_del_driver(&hdmiphy_driver);
+	put_device(&hdata->hdmiphy_port->dev);
 err_ddc:
-	i2c_del_driver(&ddc_driver);
+	put_device(&hdata->ddc_port->dev);
 	return ret;
 }
 
 static int hdmi_remove(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct exynos_drm_hdmi_context *ctx = get_hdmi_context(dev);
+	struct hdmi_context *hdata = ctx->ctx;
 
 	pm_runtime_disable(dev);
 
-	/* hdmiphy i2c driver */
-	i2c_del_driver(&hdmiphy_driver);
-	/* DDC i2c driver */
-	i2c_del_driver(&ddc_driver);
+	put_device(&hdata->hdmiphy_port->dev);
+	put_device(&hdata->ddc_port->dev);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.h b/drivers/gpu/drm/exynos/exynos_hdmi.h
deleted file mode 100644
index 0ddf395..0000000
--- a/drivers/gpu/drm/exynos/exynos_hdmi.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- *
- * Copyright (c) 2011 Samsung Electronics Co., Ltd.
- * Authors:
- *	Inki Dae <inki.dae@samsung.com>
- *	Seung-Woo Kim <sw0312.kim@samsung.com>
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- */
-
-#ifndef _EXYNOS_HDMI_H_
-#define _EXYNOS_HDMI_H_
-
-void hdmi_attach_ddc_client(struct i2c_client *ddc);
-void hdmi_attach_hdmiphy_client(struct i2c_client *hdmiphy);
-
-extern struct i2c_driver hdmiphy_driver;
-extern struct i2c_driver ddc_driver;
-
-#endif
diff --git a/drivers/gpu/drm/exynos/exynos_hdmiphy.c b/drivers/gpu/drm/exynos/exynos_hdmiphy.c
deleted file mode 100644
index 59abb14..0000000
--- a/drivers/gpu/drm/exynos/exynos_hdmiphy.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright (C) 2011 Samsung Electronics Co.Ltd
- * Authors:
- *	Seung-Woo Kim <sw0312.kim@samsung.com>
- *	Inki Dae <inki.dae@samsung.com>
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- *
- */
-
-#include <drm/drmP.h>
-
-#include <linux/kernel.h>
-#include <linux/i2c.h>
-#include <linux/of.h>
-
-#include "exynos_drm_drv.h"
-#include "exynos_hdmi.h"
-
-
-static int hdmiphy_probe(struct i2c_client *client,
-	const struct i2c_device_id *id)
-{
-	hdmi_attach_hdmiphy_client(client);
-
-	dev_info(&client->adapter->dev, "attached s5p_hdmiphy "
-		"into i2c adapter successfully\n");
-
-	return 0;
-}
-
-static int hdmiphy_remove(struct i2c_client *client)
-{
-	dev_info(&client->adapter->dev, "detached s5p_hdmiphy "
-		"from i2c adapter successfully\n");
-
-	return 0;
-}
-
-static struct of_device_id hdmiphy_match_types[] = {
-	{
-		.compatible = "samsung,exynos5-hdmiphy",
-	}, {
-		.compatible = "samsung,exynos4210-hdmiphy",
-	}, {
-		.compatible = "samsung,exynos4212-hdmiphy",
-	}, {
-		/* end node */
-	}
-};
-
-struct i2c_driver hdmiphy_driver = {
-	.driver = {
-		.name	= "exynos-hdmiphy",
-		.owner	= THIS_MODULE,
-		.of_match_table = hdmiphy_match_types,
-	},
-	.probe		= hdmiphy_probe,
-	.remove		= hdmiphy_remove,
-	.command		= NULL,
-};
-EXPORT_SYMBOL(hdmiphy_driver);
-- 
1.8.4