nb/intel/i945: Use boolean for gpu_lvds_use_spread_spectrum_clock

Change-Id: I5f11bde99dfcde81c9dc62c1102330c0a6c16e04
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70149
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/mainboard/apple/macbook21/devicetree.cb b/src/mainboard/apple/macbook21/devicetree.cb
index 833d658..a7832ef 100644
--- a/src/mainboard/apple/macbook21/devicetree.cb
+++ b/src/mainboard/apple/macbook21/devicetree.cb
@@ -5,7 +5,7 @@
 	register "gfx" = "GMA_STATIC_DISPLAYS(0)"
 
 	register "gpu_hotplug" = "0x00000220"
-	register "gpu_lvds_use_spread_spectrum_clock" = "1"
+	register "gpu_lvds_use_spread_spectrum_clock" = "true"
 	register "pwm_freq" = "180"
 	register "gpu_panel_power_up_delay" = "250"
 	register "gpu_panel_power_backlight_on_delay" = "2380"
diff --git a/src/mainboard/lenovo/t60/devicetree.cb b/src/mainboard/lenovo/t60/devicetree.cb
index c77af6b..7a9e9ae 100644
--- a/src/mainboard/lenovo/t60/devicetree.cb
+++ b/src/mainboard/lenovo/t60/devicetree.cb
@@ -5,7 +5,7 @@
 	register "gfx" = "GMA_STATIC_DISPLAYS(0)"
 
 	register "gpu_hotplug" = "0x00000220"
-	register "gpu_lvds_use_spread_spectrum_clock" = "1"
+	register "gpu_lvds_use_spread_spectrum_clock" = "true"
 	register "pwm_freq" = "275"
 	register "gpu_panel_power_up_delay" = "250"
 	register "gpu_panel_power_backlight_on_delay" = "2380"
diff --git a/src/mainboard/lenovo/x60/devicetree.cb b/src/mainboard/lenovo/x60/devicetree.cb
index d56ec51..a41749a 100644
--- a/src/mainboard/lenovo/x60/devicetree.cb
+++ b/src/mainboard/lenovo/x60/devicetree.cb
@@ -5,7 +5,7 @@
 	register "gfx" = "GMA_STATIC_DISPLAYS(0)"
 
 	register "gpu_hotplug" = "0x00000220"
-	register "gpu_lvds_use_spread_spectrum_clock" = "1"
+	register "gpu_lvds_use_spread_spectrum_clock" = "true"
 	register "pwm_freq" = "180"
 	register "gpu_panel_power_up_delay" = "250"
 	register "gpu_panel_power_backlight_on_delay" = "2380"
diff --git a/src/northbridge/intel/i945/chip.h b/src/northbridge/intel/i945/chip.h
index 0de0e58..8153462 100644
--- a/src/northbridge/intel/i945/chip.h
+++ b/src/northbridge/intel/i945/chip.h
@@ -4,6 +4,7 @@
 #define NORTHBRIDGE_INTEL_I945_CHIP_H
 
 #include <drivers/intel/gma/i915.h>
+#include <types.h>
 
 struct northbridge_intel_i945_config {
 	/* In units of 100us timer */
@@ -17,7 +18,7 @@
 
 	u32 gpu_hotplug;
 	u32 pwm_freq;
-	int gpu_lvds_use_spread_spectrum_clock;
+	bool gpu_lvds_use_spread_spectrum_clock;
 	struct i915_gpu_controller_info gfx;
 	int pci_mmio_size;
 };