gdsys: Introduce GDSYS_LEGACY_DRIVERS

Future gdsys boards will switch from the legacy drivers in board/gdsys/common
to DM-based drivers.

Define a Kconfig option that disables the legacy drivers.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/board/gdsys/common/adv7611.c b/board/gdsys/common/adv7611.c
index c416bf1..06cdc05 100644
--- a/board/gdsys/common/adv7611.c
+++ b/board/gdsys/common/adv7611.c
@@ -4,6 +4,8 @@
  * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <i2c.h>
 
@@ -174,3 +176,5 @@
 
 	return res;
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/ch7301.c b/board/gdsys/common/ch7301.c
index 1234149..5e42467 100644
--- a/board/gdsys/common/ch7301.c
+++ b/board/gdsys/common/ch7301.c
@@ -6,6 +6,8 @@
 
 /* Chrontel CH7301C DVI Transmitter */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <asm/io.h>
 #include <errno.h>
@@ -61,3 +63,5 @@
 
 	return 0;
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/dp501.c b/board/gdsys/common/dp501.c
index 69d4b8c..9ca69eb 100644
--- a/board/gdsys/common/dp501.c
+++ b/board/gdsys/common/dp501.c
@@ -6,6 +6,8 @@
 
 /* Parade Technologies Inc. DP501 DisplayPort DVI/HDMI Transmitter */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <asm/io.h>
 #include <errno.h>
@@ -155,3 +157,5 @@
 
 	return 0;
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/fanctrl.c b/board/gdsys/common/fanctrl.c
index 5e77683..27c875c 100644
--- a/board/gdsys/common/fanctrl.c
+++ b/board/gdsys/common/fanctrl.c
@@ -4,6 +4,8 @@
  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <i2c.h>
 
@@ -29,3 +31,5 @@
 	val = i2c_reg_read(addr, FAN_CONFIG) | 0x04;
 	i2c_reg_write(addr, FAN_CONFIG, val);
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/fpga.c b/board/gdsys/common/fpga.c
index f189e5f..5ba6613 100644
--- a/board/gdsys/common/fpga.c
+++ b/board/gdsys/common/fpga.c
@@ -4,6 +4,8 @@
  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <gdsys_fpga.h>
 
@@ -22,3 +24,5 @@
 
 	return 0;
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/ioep-fpga.c b/board/gdsys/common/ioep-fpga.c
index 8e10501..91eec3a 100644
--- a/board/gdsys/common/ioep-fpga.c
+++ b/board/gdsys/common/ioep-fpga.c
@@ -4,6 +4,8 @@
  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 
 #include <gdsys_fpga.h>
@@ -234,3 +236,5 @@
 
 	printf(", %d video channel(s)\n", feature_video_channels);
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/mclink.c b/board/gdsys/common/mclink.c
index bf89d4e..c43d24b 100644
--- a/board/gdsys/common/mclink.c
+++ b/board/gdsys/common/mclink.c
@@ -4,6 +4,8 @@
  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <asm/io.h>
 #include <errno.h>
@@ -134,3 +136,5 @@
 
 	return 0;
 }
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
diff --git a/board/gdsys/common/osd.c b/board/gdsys/common/osd.c
index 392d005..10c4329 100644
--- a/board/gdsys/common/osd.c
+++ b/board/gdsys/common/osd.c
@@ -4,6 +4,8 @@
  * Dirk Eibach,  Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
  */
 
+#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
+
 #include <common.h>
 #include <i2c.h>
 #include <malloc.h>
@@ -497,3 +499,5 @@
 	"size_x(max. " __stringify(MAX_X_CHARS)
 	") size_y(max. " __stringify(MAX_Y_CHARS) ")\n"
 );
+
+#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */
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