soc: fsl: guts: drop platform driver

This driver cannot be unloaded and it will be needed very early in the
boot process because other driver (weakly) depend on it (eg. for chip
errata handling). Drop all the platform driver and devres stuff and
simply make it a core_initcall.
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

@@ -110,21 +110,59 @@ static const struct fsl_soc_die_attr *fsl_soc_die_match(
 	return NULL;
 }
 
-static int fsl_guts_probe(struct platform_device *pdev)
+/*
+ * Table for matching compatible strings, for device tree
+ * guts node, for Freescale QorIQ SOCs.
+ */
+static const struct of_device_id fsl_guts_of_match[] = {
+	{ .compatible = "fsl,qoriq-device-config-1.0", },
+	{ .compatible = "fsl,qoriq-device-config-2.0", },
+	{ .compatible = "fsl,p1010-guts", },
+	{ .compatible = "fsl,p1020-guts", },
+	{ .compatible = "fsl,p1021-guts", },
+	{ .compatible = "fsl,p1022-guts", },
+	{ .compatible = "fsl,p1023-guts", },
+	{ .compatible = "fsl,p2020-guts", },
+	{ .compatible = "fsl,bsc9131-guts", },
+	{ .compatible = "fsl,bsc9132-guts", },
+	{ .compatible = "fsl,mpc8536-guts", },
+	{ .compatible = "fsl,mpc8544-guts", },
+	{ .compatible = "fsl,mpc8548-guts", },
+	{ .compatible = "fsl,mpc8568-guts", },
+	{ .compatible = "fsl,mpc8569-guts", },
+	{ .compatible = "fsl,mpc8572-guts", },
+	{ .compatible = "fsl,ls1021a-dcfg", },
+	{ .compatible = "fsl,ls1043a-dcfg", },
+	{ .compatible = "fsl,ls2080a-dcfg", },
+	{ .compatible = "fsl,ls1088a-dcfg", },
+	{ .compatible = "fsl,ls1012a-dcfg", },
+	{ .compatible = "fsl,ls1046a-dcfg", },
+	{ .compatible = "fsl,lx2160a-dcfg", },
+	{ .compatible = "fsl,ls1028a-dcfg", },
+	{}
+};
+
+static int __init fsl_guts_init(void)
 {
-	struct device_node *np = pdev->dev.of_node;
 	struct soc_device_attribute *soc_dev_attr;
 	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;
+	struct device_node *np;
 	bool little_endian;
 	u32 svr;
+	int ret;
+
+	np = of_find_matching_node_and_match(NULL, fsl_guts_of_match, NULL);
+	if (!np)
+		return 0;
 
 	regs = of_iomap(np, 0);
-	if (IS_ERR(regs))
+	if (IS_ERR(regs)) {
+		of_node_put(np);
 		return PTR_ERR(regs);
+	}
 
 	little_endian = of_property_read_bool(np, "little-endian");
 	if (little_endian)
@@ -132,92 +170,62 @@ static int fsl_guts_probe(struct platform_device *pdev)
 	else
 		svr = ioread32be(&regs->svr);
 	iounmap(regs);
+	of_node_put(np);
 
 	/* Register soc device */
-	soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr), GFP_KERNEL);
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 	if (!soc_dev_attr)
 		return -ENOMEM;
 
 	if (of_property_read_string(of_root, "model", &machine))
 		of_property_read_string_index(of_root, "compatible", 0, &machine);
 	if (machine) {
-		soc_dev_attr->machine = devm_kstrdup(dev, machine, GFP_KERNEL);
+		soc_dev_attr->machine = kstrdup(machine, GFP_KERNEL);
 		if (!soc_dev_attr->machine)
-			return -ENOMEM;
+			goto err_nomem;
 	}
 
 	soc_die = fsl_soc_die_match(svr, fsl_soc_die);
 	if (soc_die) {
-		soc_dev_attr->family = devm_kasprintf(dev, GFP_KERNEL,
-						      "QorIQ %s", soc_die->die);
+		soc_dev_attr->family = kasprintf(GFP_KERNEL, "QorIQ %s",
+						 soc_die->die);
 	} else {
-		soc_dev_attr->family = devm_kasprintf(dev, GFP_KERNEL, "QorIQ");
+		soc_dev_attr->family = kasprintf(GFP_KERNEL, "QorIQ");
 	}
 	if (!soc_dev_attr->family)
-		return -ENOMEM;
-	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL,
-					      "svr:0x%08x", svr);
+		goto err_nomem;
+
+	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "svr:0x%08x", svr);
 	if (!soc_dev_attr->soc_id)
-		return -ENOMEM;
-	soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
-						(svr >>  4) & 0xf, svr & 0xf);
+		goto err_nomem;
+
+	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
+					   (svr >>  4) & 0xf, svr & 0xf);
 	if (!soc_dev_attr->revision)
-		return -ENOMEM;
+		goto err_nomem;
 
 	soc_dev = soc_device_register(soc_dev_attr);
-	if (IS_ERR(soc_dev))
-		return PTR_ERR(soc_dev);
+	if (IS_ERR(soc_dev)) {
+		ret = PTR_ERR(soc_dev);
+		goto err;
+	}
 
 	pr_info("Machine: %s\n", soc_dev_attr->machine);
 	pr_info("SoC family: %s\n", soc_dev_attr->family);
 	pr_info("SoC ID: %s, Revision: %s\n",
 		soc_dev_attr->soc_id, soc_dev_attr->revision);
-	return 0;
-}
 
-/*
- * Table for matching compatible strings, for device tree
- * guts node, for Freescale QorIQ SOCs.
- */
-static const struct of_device_id fsl_guts_of_match[] = {
-	{ .compatible = "fsl,qoriq-device-config-1.0", },
-	{ .compatible = "fsl,qoriq-device-config-2.0", },
-	{ .compatible = "fsl,p1010-guts", },
-	{ .compatible = "fsl,p1020-guts", },
-	{ .compatible = "fsl,p1021-guts", },
-	{ .compatible = "fsl,p1022-guts", },
-	{ .compatible = "fsl,p1023-guts", },
-	{ .compatible = "fsl,p2020-guts", },
-	{ .compatible = "fsl,bsc9131-guts", },
-	{ .compatible = "fsl,bsc9132-guts", },
-	{ .compatible = "fsl,mpc8536-guts", },
-	{ .compatible = "fsl,mpc8544-guts", },
-	{ .compatible = "fsl,mpc8548-guts", },
-	{ .compatible = "fsl,mpc8568-guts", },
-	{ .compatible = "fsl,mpc8569-guts", },
-	{ .compatible = "fsl,mpc8572-guts", },
-	{ .compatible = "fsl,ls1021a-dcfg", },
-	{ .compatible = "fsl,ls1043a-dcfg", },
-	{ .compatible = "fsl,ls2080a-dcfg", },
-	{ .compatible = "fsl,ls1088a-dcfg", },
-	{ .compatible = "fsl,ls1012a-dcfg", },
-	{ .compatible = "fsl,ls1046a-dcfg", },
-	{ .compatible = "fsl,lx2160a-dcfg", },
-	{ .compatible = "fsl,ls1028a-dcfg", },
-	{}
-};
-MODULE_DEVICE_TABLE(of, fsl_guts_of_match);
+	return 0;
 
-static struct platform_driver fsl_guts_driver = {
-	.driver = {
-		.name = "fsl-guts",
-		.of_match_table = fsl_guts_of_match,
-	},
-	.probe = fsl_guts_probe,
-};
+err_nomem:
+	ret = -ENOMEM;
+err:
+	kfree(soc_dev_attr->machine);
+	kfree(soc_dev_attr->family);
+	kfree(soc_dev_attr->soc_id);
+	kfree(soc_dev_attr->revision);
+	kfree(soc_dev_attr);
 
-static int __init fsl_guts_init(void)
-{
-	return platform_driver_register(&fsl_guts_driver);
+	return ret;
 }
 core_initcall(fsl_guts_init);