mb/google: Use boolean type for "enable" argument for regulator

Because 0 and 1 are the only possible values,
1. Change input argument "enable" of mainboard_enable_regulator to bool.
2. Change return value of mainboard_regulator_is_enabled() to bool.

TEST=build pass
BUG=b:233720142

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Change-Id: Iae09c5fedf8f7394bfbb677e5aee37ed061304fd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65997
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/asurada/regulator.c

@@ -94,7 +94,7 @@ uint32_t mainboard_get_regulator_voltage(enum mtk_regulator regulator)
 	return 0;
 }
 
-int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable)
+int mainboard_enable_regulator(enum mtk_regulator regulator, bool enable)
 {
 	/* Return 0 if the regulator is already enabled or disabled. */
 	if (mainboard_regulator_is_enabled(regulator) == enable)
@@ -111,7 +111,7 @@ int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable)
 	return google_chromeec_regulator_enable(id, enable);
 }
 
-uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
+bool mainboard_regulator_is_enabled(enum mtk_regulator regulator)
 {
 	int id;
 
@@ -119,7 +119,7 @@ uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
 	if (id < 0) {
 		printk(BIOS_WARNING, "Invalid regulator ID: %d\n; assuming disabled",
 		       regulator);
-		return 0;
+		return false;
 	}
 
 	uint8_t enabled;
@@ -127,8 +127,8 @@ uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
 		printk(BIOS_WARNING,
 		       "Failed to query regulator ID: %d\n; assuming disabled",
 		       regulator);
-		return 0;
+		return false;
 	}
 
-	return enabled;
+	return !!enabled;
 }

src/mainboard/google/cherry/regulator.c

@@ -123,7 +123,7 @@ uint32_t mainboard_get_regulator_voltage(enum mtk_regulator regulator)
 	return 0;
 }
 
-int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable)
+int mainboard_enable_regulator(enum mtk_regulator regulator, bool enable)
 {
 	if (check_regulator_control(regulator) < 0)
 		return 0;
@@ -154,17 +154,17 @@ int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable)
 	return -1;
 }
 
-uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
+bool mainboard_regulator_is_enabled(enum mtk_regulator regulator)
 {
 	if (check_regulator_control(regulator) < 0)
-		return 0;
+		return false;
 
 	int id;
 
 	id = get_mt6360_regulator_id(regulator);
 	if (id >= 0) {
 		if (CONFIG(BOARD_GOOGLE_CHERRY)) {
-			return mt6360_is_enabled(id);
+			return !!mt6360_is_enabled(id);
 		} else {
 			uint8_t enabled;
 			if (google_chromeec_regulator_is_enabled(id, &enabled) < 0) {
@@ -172,12 +172,12 @@ uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator)
 				       "Failed to retrieve is_enabled by ec; assuming disabled\n");
 				return 0;
 			}
-			return enabled;
+			return !!enabled;
 		}
 
 	}
 
 	printk(BIOS_ERR, "Invalid regulator ID: %d\n; assuming disabled", regulator);
 
-	return 0;
+	return false;
 }

src/soc/mediatek/common/include/soc/regulator.h

@@ -25,7 +25,7 @@ enum mtk_regulator {
 
 void mainboard_set_regulator_voltage(enum mtk_regulator regulator, uint32_t voltage_uv);
 uint32_t mainboard_get_regulator_voltage(enum mtk_regulator regulator);
-int mainboard_enable_regulator(enum mtk_regulator regulator, uint8_t enable);
-uint8_t mainboard_regulator_is_enabled(enum mtk_regulator regulator);
+int mainboard_enable_regulator(enum mtk_regulator regulator, bool enable);
+bool mainboard_regulator_is_enabled(enum mtk_regulator regulator);
 
 #endif /* SOC_MEDIATEK_COMMON_REGULATOR_H */

src/soc/mediatek/mt8192/msdc.c

@@ -57,7 +57,6 @@ void mtk_msdc_configure_sdcard(void)
 	void *gpio_base = (void *)IOCFG_RM_BASE;
 	void *gpio_mode0_base = (void *)MSDC1_GPIO_MODE0_BASE;
 	void *gpio_mode1_base = (void *)MSDC1_GPIO_MODE1_BASE;
-	uint8_t enable = 1;
 	int i;
 
 	const gpio_t sdcard_pu_pin[] = {
@@ -85,6 +84,6 @@ void mtk_msdc_configure_sdcard(void)
 	/* set sdcard dat1 pin to msdc1 mode */
 	clrsetbits32(gpio_mode1_base, MSDC1_GPIO_MODE1_MASK, MSDC1_GPIO_MODE1_VALUE);
 
-	mainboard_enable_regulator(MTK_REGULATOR_VCC, enable);
-	mainboard_enable_regulator(MTK_REGULATOR_VCCQ, enable);
+	mainboard_enable_regulator(MTK_REGULATOR_VCC, true);
+	mainboard_enable_regulator(MTK_REGULATOR_VCCQ, true);
 }

src/soc/mediatek/mt8195/msdc.c

@@ -103,6 +103,6 @@ void mtk_msdc_configure_sdcard(void)
 	if (CONFIG(BOARD_GOOGLE_CHERRY))
 		mt6360_init(I2C7);
 
-	mainboard_enable_regulator(MTK_REGULATOR_VCCQ, 1);
-	mainboard_enable_regulator(MTK_REGULATOR_VCC, 1);
+	mainboard_enable_regulator(MTK_REGULATOR_VCCQ, true);
+	mainboard_enable_regulator(MTK_REGULATOR_VCC, true);
 }