src/mainboard: Use 'const' to set pnp_devfn_t statically

Change-Id: I50ac6914fadc02491df2eccb437eada89fd12b82
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40272
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/mainboard/asus/f2a85-m/bootblock.c b/src/mainboard/asus/f2a85-m/bootblock.c
index c63ab08..4fe0423 100644
--- a/src/mainboard/asus/f2a85-m/bootblock.c
+++ b/src/mainboard/asus/f2a85-m/bootblock.c
@@ -24,8 +24,8 @@
 
 static void superio_init_m(void)
 {
-	pnp_devfn_t uart = PNP_DEV(0x2e, IT8728F_SP1);
-	pnp_devfn_t gpio = PNP_DEV(0x2e, IT8728F_GPIO);
+	const pnp_devfn_t uart = PNP_DEV(0x2e, IT8728F_SP1);
+	const pnp_devfn_t gpio = PNP_DEV(0x2e, IT8728F_GPIO);
 
 	ite_kill_watchdog(gpio);
 	ite_enable_serial(uart, CONFIG_TTYS0_BASE);
@@ -34,7 +34,7 @@
 
 static void superio_init_m_pro(void)
 {
-	pnp_devfn_t uart = PNP_DEV(0x2e, NCT6779D_SP1);
+	const pnp_devfn_t uart = PNP_DEV(0x2e, NCT6779D_SP1);
 
 	nuvoton_enable_serial(uart, CONFIG_TTYS0_BASE);
 }
diff --git a/src/mainboard/getac/p470/early_init.c b/src/mainboard/getac/p470/early_init.c
index cc126dd..04d0c0b 100644
--- a/src/mainboard/getac/p470/early_init.c
+++ b/src/mainboard/getac/p470/early_init.c
@@ -66,9 +66,7 @@
 
 void bootblock_mainboard_early_init(void)
 {
-	pnp_devfn_t dev;
-
-	dev = PNP_DEV(0x4e, 0x00);
+	const pnp_devfn_t dev = PNP_DEV(0x4e, 0x00);
 
 	pnp_enter_ext_func_mode(dev);
 	pnp_write_config(dev, 0x02, 0x0e); // UART power
diff --git a/src/mainboard/kontron/ktqm77/early_init.c b/src/mainboard/kontron/ktqm77/early_init.c
index 5651064..949eab2 100644
--- a/src/mainboard/kontron/ktqm77/early_init.c
+++ b/src/mainboard/kontron/ktqm77/early_init.c
@@ -35,7 +35,7 @@
 {
 	int lvds_3v = 0; /* 0 (5V) or 1 (3V3) */
 	int dis_bl_inv = 1; /* backlight inversion: 1 = disabled, 0 = enabled */
-	pnp_devfn_t dev = PNP_DEV(0x2e, 0x9);
+	const pnp_devfn_t dev = PNP_DEV(0x2e, 0x9);
 	pnp_enter_conf_state(dev);
 	pnp_write_config(dev, 0x29, 0x02); /* Pins 119, 120 are GPIO21, 20 */
 	pnp_write_config(dev, 0x30, 0x03); /* Enable GPIO2+3 */
diff --git a/src/mainboard/lenovo/t60/early_init.c b/src/mainboard/lenovo/t60/early_init.c
index dba4c4c..3201102 100644
--- a/src/mainboard/lenovo/t60/early_init.c
+++ b/src/mainboard/lenovo/t60/early_init.c
@@ -22,7 +22,7 @@
 static void early_superio_config(void)
 {
 	int timeout = 100000;
-	pnp_devfn_t dev = PNP_DEV(0x2e, 3);
+	const pnp_devfn_t dev = PNP_DEV(0x2e, 3);
 
 	pnp_write_config(dev, 0x29, 0xa0);
 
diff --git a/src/mainboard/lenovo/x60/early_init.c b/src/mainboard/lenovo/x60/early_init.c
index ef760fb..5a8fc78 100644
--- a/src/mainboard/lenovo/x60/early_init.c
+++ b/src/mainboard/lenovo/x60/early_init.c
@@ -22,7 +22,7 @@
 static void early_superio_config(void)
 {
 	int timeout = 100000;
-	pnp_devfn_t dev = PNP_DEV(0x2e, 3);
+	const pnp_devfn_t dev = PNP_DEV(0x2e, 3);
 
 	pnp_write_config(dev, 0x29, 0x06);
 
diff --git a/src/mainboard/roda/rk886ex/early_init.c b/src/mainboard/roda/rk886ex/early_init.c
index fe61187..baa17d1 100644
--- a/src/mainboard/roda/rk886ex/early_init.c
+++ b/src/mainboard/roda/rk886ex/early_init.c
@@ -35,9 +35,7 @@
 
 void bootblock_mainboard_early_init(void)
 {
-	pnp_devfn_t dev;
-
-	dev = PNP_DEV(0x2e, 0x00);
+	const pnp_devfn_t dev = PNP_DEV(0x2e, 0x00);
 
 	pnp_enter_conf_state(dev);
 	pnp_write_config(dev, 0x01, 0x94); /* Extended Parport modes */