drm/mediatek: Separate mtk_hdmi_phy to an independent module

mtk_hdmi_phy is a part of mtk_hdmi module, but phy driver should be an
independent module rather than be part of drm module, so separate the phy
driver to an independent module.

Signed-off-by: CK Hu <[e-mail]>
Signed-off-by: Chun-Kuang Hu <[e-mail]>
Tested-by: Frank Wunderlich <[e-mail]>

drivers/gpu/drm/mediatek/Kconfig

···
 	tristate "DRM HDMI Support for Mediatek SoCs"
 	depends on DRM_MEDIATEK
 	select SND_SOC_HDMI_CODEC if SND_SOC
-	select GENERIC_PHY
+	select PHY_MTK_HDMI
 	help
 	  DRM/KMS HDMI driver for Mediatek SoCs
+
+config PHY_MTK_HDMI
+	tristate "MediaTek HDMI-PHY Driver"
+	depends on ARCH_MEDIATEK && OF
+	select GENERIC_PHY
+	help
+	  Support HDMI PHY for Mediatek SoCs.

drivers/gpu/drm/mediatek/Makefile

···
 
 mediatek-drm-hdmi-objs := mtk_cec.o \
 			  mtk_hdmi.o \
-			  mtk_hdmi_ddc.o \
-			  mtk_mt2701_hdmi_phy.o \
-			  mtk_mt8173_hdmi_phy.o \
-			  mtk_hdmi_phy.o
+			  mtk_hdmi_ddc.o
 
 obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mediatek-drm-hdmi.o
+
+phy-mtk-hdmi-drv-objs := mtk_hdmi_phy.o \
+			 mtk_mt2701_hdmi_phy.o \
+			 mtk_mt8173_hdmi_phy.o
+
+obj-$(CONFIG_PHY_MTK_HDMI) += phy-mtk-hdmi-drv.o

drivers/gpu/drm/mediatek/mtk_hdmi.c

···
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of_platform.h>
 #include <linux/of.h>
···
 };
 
 static struct platform_driver * const mtk_hdmi_drivers[] = {
-	&mtk_hdmi_phy_driver,
 	&mtk_hdmi_ddc_driver,
 	&mtk_cec_driver,
 	&mtk_hdmi_driver,

drivers/gpu/drm/mediatek/mtk_hdmi.h

···
  */
 #ifndef _MTK_HDMI_CTRL_H
 #define _MTK_HDMI_CTRL_H
-#include "mtk_hdmi_phy.h"
 
 struct platform_driver;
 

drivers/gpu/drm/mediatek/mtk_hdmi_phy.c

···
 		.of_match_table = mtk_hdmi_phy_match,
 	},
 };
+module_platform_driver(mtk_hdmi_phy_driver);
 
 MODULE_DESCRIPTION("MediaTek HDMI PHY Driver");
 MODULE_LICENSE("GPL v2");

drivers/gpu/drm/mediatek/mtk_hdmi_phy.h

···
 		       u32 val, u32 mask);
 struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw);
 
-extern struct platform_driver mtk_hdmi_phy_driver;
 extern struct mtk_hdmi_phy_conf mtk_hdmi_phy_8173_conf;
 extern struct mtk_hdmi_phy_conf mtk_hdmi_phy_2701_conf;