pmic: dm: Rewrite pmic_reg_{read|write|clrsetbits} to support 3 bytes transmissions

This commit provides support for transmissions larger than 1 byte for
PMIC devices used with DM (e.g. MC34708 from NXP).

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/power/pmic/pmic-uclass.c

@@ -130,23 +130,35 @@ int pmic_write(struct udevice *dev, uint reg, const uint8_t *buffer, int len)
 
 int pmic_reg_read(struct udevice *dev, uint reg)
 {
-	u8 byte;
+	struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
+	u32 val = 0;
 	int ret;
 
-	debug("%s: reg=%x", __func__, reg);
-	ret = pmic_read(dev, reg, &byte, 1);
-	debug(", value=%x, ret=%d\n", byte, ret);
+	if (priv->trans_len < 1 || priv->trans_len > sizeof(val)) {
+		debug("Wrong transmission size [%d]\n", priv->trans_len);
+		return -EINVAL;
+	}
+
+	debug("%s: reg=%x priv->trans_len:%d", __func__, reg, priv->trans_len);
+	ret = pmic_read(dev, reg, (uint8_t *)&val, priv->trans_len);
+	debug(", value=%x, ret=%d\n", val, ret);
 
-	return ret ? ret : byte;
+	return ret ? ret : val;
 }
 
 int pmic_reg_write(struct udevice *dev, uint reg, uint value)
 {
-	u8 byte = value;
+	struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
 	int ret;
 
-	debug("%s: reg=%x, value=%x", __func__, reg, value);
-	ret = pmic_write(dev, reg, &byte, 1);
+	if (priv->trans_len < 1 || priv->trans_len > sizeof(value)) {
+		debug("Wrong transmission size [%d]\n", priv->trans_len);
+		return -EINVAL;
+	}
+
+	debug("%s: reg=%x, value=%x priv->trans_len:%d", __func__, reg, value,
+	      priv->trans_len);
+	ret = pmic_write(dev, reg, (uint8_t *)&value, priv->trans_len);
 	debug(", ret=%d\n", ret);
 
 	return ret;
@@ -154,15 +166,21 @@ int pmic_reg_write(struct udevice *dev, uint reg, uint value)
 
 int pmic_clrsetbits(struct udevice *dev, uint reg, uint clr, uint set)
 {
-	u8 byte;
+	struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
+	u32 val = 0;
 	int ret;
 
-	ret = pmic_reg_read(dev, reg);
+	if (priv->trans_len < 1 || priv->trans_len > sizeof(val)) {
+		debug("Wrong transmission size [%d]\n", priv->trans_len);
+		return -EINVAL;
+	}
+
+	ret = pmic_read(dev, reg, (uint8_t *)&val, priv->trans_len);
 	if (ret < 0)
 		return ret;
-	byte = (ret & ~clr) | set;
 
-	return pmic_reg_write(dev, reg, byte);
+	val = (val & ~clr) | set;
+	return pmic_write(dev, reg, (uint8_t *)&val, priv->trans_len);
 }
 
 static int pmic_pre_probe(struct udevice *dev)