soc: fsl: guts: embed fsl_guts_get_svr() in probe()

Move the reading of the SVR into the probe function as
fsl_guts_get_svr() is the only user of the static guts variable and this
lets us drop that as well as the malloc() for this variable. Also, we
can unmap the memory region after we accessed it, which will simplify
error handling later.
Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/soc/fsl/guts.c

@@ -14,18 +14,12 @@
 #include <linux/platform_device.h>
 #include <linux/fsl/guts.h>
 
-struct guts {
-	struct ccsr_guts __iomem *regs;
-	bool little_endian;
-};
-
 struct fsl_soc_die_attr {
 	char	*die;
 	u32	svr;
 	u32	mask;
 };
 
-static struct guts *guts;
 static struct soc_device_attribute soc_dev_attr;
 
 
@@ -119,40 +113,27 @@ static const struct fsl_soc_die_attr *fsl_soc_die_match(
 	return NULL;
 }
 
-static u32 fsl_guts_get_svr(void)
-{
-	u32 svr = 0;
-
-	if (!guts || !guts->regs)
-		return svr;
-
-	if (guts->little_endian)
-		svr = ioread32(&guts->regs->svr);
-	else
-		svr = ioread32be(&guts->regs->svr);
-
-	return svr;
-}
-
 static int fsl_guts_probe(struct platform_device *pdev)
 {
 	struct device_node *root, *np = pdev->dev.of_node;
 	static struct soc_device *soc_dev;
 	struct device *dev = &pdev->dev;
 	const struct fsl_soc_die_attr *soc_die;
+	struct ccsr_guts __iomem *regs;
 	const char *machine = NULL;
+	bool little_endian;
 	u32 svr;
 
-	/* Initialize guts */
-	guts = devm_kzalloc(dev, sizeof(*guts), GFP_KERNEL);
-	if (!guts)
-		return -ENOMEM;
-
-	guts->little_endian = of_property_read_bool(np, "little-endian");
+	regs = of_iomap(np, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
 
-	guts->regs = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(guts->regs))
-		return PTR_ERR(guts->regs);
+	little_endian = of_property_read_bool(np, "little-endian");
+	if (little_endian)
+		svr = ioread32(&regs->svr);
+	else
+		svr = ioread32be(&regs->svr);
+	iounmap(regs);
 
 	/* Register soc device */
 	root = of_find_node_by_path("/");
@@ -167,7 +148,6 @@ static int fsl_guts_probe(struct platform_device *pdev)
 	}
 	of_node_put(root);
 
-	svr = fsl_guts_get_svr();
 	soc_die = fsl_soc_die_match(svr, fsl_soc_die);
 	if (soc_die) {
 		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL,