power: change from meaningless value to error number

'-1' is absolutely meaningless value.
This patch changed from meaningless value to error number.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 6 insertions, 12 deletions

diff --git a/drivers/power/power_spi.c b/drivers/power/power_spi.c
index 1e554461f3..ef8531df0f 100644
--- a/drivers/power/power_spi.c
+++ b/drivers/power/power_spi.c
@@ -27,14 +27,14 @@ static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
 					p->hw.spi.mode);
 
 		if (!slave)
-			return -1;
+			return -ENODEV;
 	}
 
 	if (check_reg(p, reg))
-		return -1;
+		return -EINVAL;
 
 	if (spi_claim_bus(slave))
-		return -1;
+		return -EBUSY;
 
 	pmic_tx = p->hw.spi.prepare_tx(reg, val, write);
 
@@ -59,21 +59,15 @@ static u32 pmic_reg(struct pmic *p, u32 reg, u32 *val, u32 write)
 
 err:
 	spi_release_bus(slave);
-	return -1;
+	return -ENOTSUPP;
 }
 
 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
 {
-	if (pmic_reg(p, reg, &val, 1))
-		return -1;
-
-	return 0;
+	return pmic_reg(p, reg, &val, 1);
 }
 
 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
 {
-	if (pmic_reg(p, reg, val, 0))
-		return -1;
-
-	return 0;
+	return pmic_reg(p, reg, val, 0);
 }