net: dsa: b53: Fix sparse warnings in b53_mmap.c

sparse complains about the following warnings:

drivers/net/dsa/b53/b53_mmap.c:33:31: warning: incorrect type in
initializer (different address spaces)
drivers/net/dsa/b53/b53_mmap.c:33:31: expected unsigned char
[noderef] [usertype] <asn:2>*regs
drivers/net/dsa/b53/b53_mmap.c:33:31: got void *priv

and indeed, while what we are doing is functional, we are dereferencing
a void * pointer into a void __iomem * which is not great. Just use the
defined b53_mmap_priv structure which holds our register base and use
that.

Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch")
Signed-off-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/dsa/b53/b53_mmap.c

···
 
 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	*val = readb(regs + (page << 8) + reg);
 
···
 
 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	if (WARN_ON(reg % 2))
 		return -EINVAL;
···
 
 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	if (WARN_ON(reg % 4))
 		return -EINVAL;
···
 
 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	if (WARN_ON(reg % 2))
 		return -EINVAL;
···
 
 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 	u32 hi, lo;
 
 	if (WARN_ON(reg % 4))
···
 
 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	writeb(value, regs + (page << 8) + reg);
 
···
 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
 			    u16 value)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	if (WARN_ON(reg % 2))
 		return -EINVAL;
···
 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
 			    u32 value)
 {
-	u8 __iomem *regs = dev->priv;
+	struct b53_mmap_priv *priv = dev->priv;
+	void __iomem *regs = priv->regs;
 
 	if (WARN_ON(reg % 4))
 		return -EINVAL;
···
 static int b53_mmap_probe(struct platform_device *pdev)
 {
 	struct b53_platform_data *pdata = pdev->dev.platform_data;
+	struct b53_mmap_priv *priv;
 	struct b53_device *dev;
 
 	if (!pdata)
 		return -EINVAL;
 
-	dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, pdata->regs);
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->regs = pdata->regs;
+
+	dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
 	if (!dev)
 		return -ENOMEM;