src: Remove non-ascii characters

Change-Id: Iedb78e24a286a51830c85724af0179995ed553be
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/26434
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/drivers/i2c/max98373/chip.h b/src/drivers/i2c/max98373/chip.h
index 150998b..ad81395 100644
--- a/src/drivers/i2c/max98373/chip.h
+++ b/src/drivers/i2c/max98373/chip.h
@@ -19,7 +19,7 @@
 struct drivers_i2c_max98373_config {
 	/* I2C Bus Frequency in Hertz (default 400kHz) */
 	uint32_t bus_speed;
-	/* Set ‘1’ if I2S channel size is not 32bit. */
+	/* Set '1' if I2S channel size is not 32bit. */
 	bool interleave_mode;
 	/* Identifier for chips */
 	uint32_t uid;
diff --git a/src/drivers/i2c/max98927/chip.h b/src/drivers/i2c/max98927/chip.h
index 765bafd..6d3b9a5 100644
--- a/src/drivers/i2c/max98927/chip.h
+++ b/src/drivers/i2c/max98927/chip.h
@@ -19,7 +19,7 @@
 struct drivers_i2c_max98927_config {
 	/* I2C Bus Frequency in Hertz (default 400kHz) */
 	unsigned int bus_speed;
-	/* Set ‘1’ if I2S channel size is not 32bit. */
+	/* Set '1' if I2S channel size is not 32bit. */
 	bool interleave_mode;
 	/* Identifier for chips */
 	unsigned int uid;
diff --git a/src/soc/intel/apollolake/include/soc/meminit.h b/src/soc/intel/apollolake/include/soc/meminit.h
index 3b0b507..27b6556 100644
--- a/src/soc/intel/apollolake/include/soc/meminit.h
+++ b/src/soc/intel/apollolake/include/soc/meminit.h
@@ -72,7 +72,7 @@
 /*
  * ODT settings :
  * If ODT PIN to LP4 DRAM is pulled HIGH for ODT_A, and HIGH for ODT_B,
- * choose ODT_AB_HIGH_HIGH. If ODT PIN to LP4 DRAM is pulled HIGH for ODT_A,
+ * choose ODT_AB_HIGH_HIGH. If ODT PIN to LP4 DRAM is pulled HIGH for ODT_A,
  * and LOW for ODT_B, choose ODT_AB_HIGH_LOW.
  *
  * Note that the enum values correspond to the interpreted UPD fields
diff --git a/src/soc/intel/cannonlake/lockdown.c b/src/soc/intel/cannonlake/lockdown.c
index dba5901..7a3b0c0 100644
--- a/src/soc/intel/cannonlake/lockdown.c
+++ b/src/soc/intel/cannonlake/lockdown.c
@@ -60,8 +60,8 @@
 	 * GCS.BBS: (Boot BIOS Strap) This field determines the destination
 	 * of accesses to the BIOS memory range.
 	 *	Bits Description
-	 *	“0b”: SPI
-	 *	“1b”: LPC/eSPI
+	 *	"0b": SPI
+	 *	"1b": LPC/eSPI
 	 */
 	pcr_or8(PID_DMI, PCR_DMI_GCS, PCR_DMI_GCS_BILD);
 }
diff --git a/src/soc/intel/skylake/lockdown.c b/src/soc/intel/skylake/lockdown.c
index 79f6f70..1abe9cb 100644
--- a/src/soc/intel/skylake/lockdown.c
+++ b/src/soc/intel/skylake/lockdown.c
@@ -57,8 +57,8 @@
 	 * GCS.BBS: (Boot BIOS Strap) This field determines the destination
 	 * of accesses to the BIOS memory range.
 	 * 	Bits Description
-	 * 	“0b”: SPI
-	 * 	“1b”: LPC/eSPI
+	 * 	"0b": SPI
+	 * 	"1b": LPC/eSPI
 	 */
 	pcr_or8(PID_DMI, PCR_DMI_GCS, PCR_DMI_GCS_BILD);
 }
diff --git a/src/soc/rockchip/rk3399/Kconfig b/src/soc/rockchip/rk3399/Kconfig
index 1d2960b..440981b 100644
--- a/src/soc/rockchip/rk3399/Kconfig
+++ b/src/soc/rockchip/rk3399/Kconfig
@@ -32,7 +32,7 @@
 	default n
 	help
 	  Select Spread Spectrum Modulator (SSMOD) is a fully-digital circuit
-	  used to modulate the frequency of the Silicon Creations’ Fractional
+	  used to modulate the frequency of the Silicon Creations' Fractional
 	  PLL in order to reduce EMI.
 
 endif
diff --git a/src/soc/rockchip/rk3399/clock.c b/src/soc/rockchip/rk3399/clock.c
index 980adf5..5422deb 100644
--- a/src/soc/rockchip/rk3399/clock.c
+++ b/src/soc/rockchip/rk3399/clock.c
@@ -344,12 +344,12 @@
 /*
  * Configure the DPLL spread spectrum feature on memory clock.
  * Configure sequence:
- * 1. PLL been configured as frac mode, and DACPD should be set to 1’b0.
+ * 1. PLL been configured as frac mode, and DACPD should be set to 1'b0.
  * 2. Configure DOWNSPERAD, SPREAD, DIVVAL(option: configure xPLL_CON5 with
  *    extern wave table).
- * 3. set ssmod_disable_sscg = 1’b0, and set ssmod_bp = 1’b0.
- * 4. Assert RESET = 1’b1 to SSMOD.
- * 5. RESET = 1’b0 on SSMOD.
+ * 3. set ssmod_disable_sscg = 1'b0, and set ssmod_bp = 1'b0.
+ * 4. Assert RESET = 1'b1 to SSMOD.
+ * 5. RESET = 1'b0 on SSMOD.
  * 6. Adjust SPREAD/DIVVAL/DOWNSPREAD.
  */
 static void rkclk_set_dpllssc(struct pll_div *dpll_cfg)
@@ -385,13 +385,13 @@
 	 * value of SPREAD.
 	 * SPREAD[4:0]	Center Spread	Down Spread
 	 *	0	0		0
-	 *	1	±0.1%		-0.10%
-	 *	2	±0.2%		-0.20%
-	 *	3	±0.3%		-0.30%
-	 *	4	±0.4%		-0.40%
-	 *	5	±0.5%		-0.50%
+	 *	1	+/-0.1%		-0.10%
+	 *	2	+/-0.2%		-0.20%
+	 *	3	+/-0.3%		-0.30%
+	 *	4	+/-0.4%		-0.40%
+	 *	5	+/-0.5%		-0.50%
 	 *	...
-	 *	31	±3.1%		-3.10%
+	 *	31	+/-3.1%		-3.10%
 	 */
 	write32(&cru_ptr->dpll_con[4],
 		RK_CLRSETBITS(PLL_SSMOD_DIVVAL_MASK << PLL_SSMOD_DIVVAL_SHIFT,
diff --git a/src/southbridge/via/vt8237r/acpi/default_irq_route.asl b/src/southbridge/via/vt8237r/acpi/default_irq_route.asl
index 2e9e763..3515078 100644
--- a/src/southbridge/via/vt8237r/acpi/default_irq_route.asl
+++ b/src/southbridge/via/vt8237r/acpi/default_irq_route.asl
@@ -71,7 +71,7 @@
 			Package (4) { 0x0010ffff, 2, 0x00, 21 },
 			Package (4) { 0x0010ffff, 3, 0x00, 21 },
 
-			/* AC’97 / MC’97 IRQ and INTG => IRQ22 */
+			/* AC'97 / MC'97 IRQ and INTG => IRQ22 */
 			Package (4) { 0x0011ffff, 0, 0x00, 22 },
 			Package (4) { 0x0011ffff, 1, 0x00, 22 },
 			Package (4) { 0x0011ffff, 2, 0x00, 22 },