soc/tegra: fuse: Add custom SoC attributes

index 802717b9f6a3..db65ddb6a5d2 100644
@@ -300,6 +300,59 @@ static void tegra_enable_fuse_clk(void __iomem *base)
 	writel(reg, base + 0x14);
 }
 
+static ssize_t major_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	return sprintf(buf, "%d\n", tegra_get_major_rev());
+}
+
+static DEVICE_ATTR_RO(major);
+
+static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	return sprintf(buf, "%d\n", tegra_get_minor_rev());
+}
+
+static DEVICE_ATTR_RO(minor);
+
+static struct attribute *tegra_soc_attr[] = {
+	&dev_attr_major.attr,
+	&dev_attr_minor.attr,
+	NULL,
+};
+
+const struct attribute_group tegra_soc_attr_group = {
+	.attrs = tegra_soc_attr,
+};
+
+#ifdef CONFIG_ARCH_TEGRA_194_SOC
+static ssize_t platform_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	/*
+	 * Displays the value in the 'pre_si_platform' field of the HIDREV
+	 * register for Tegra194 devices. A value of 0 indicates that the
+	 * platform type is silicon and all other non-zero values indicate
+	 * the type of simulation platform is being used.
+	 */
+	return sprintf(buf, "%d\n", (tegra_read_chipid() >> 20) & 0xf);
+}
+
+static DEVICE_ATTR_RO(platform);
+
+static struct attribute *tegra194_soc_attr[] = {
+	&dev_attr_major.attr,
+	&dev_attr_minor.attr,
+	&dev_attr_platform.attr,
+	NULL,
+};
+
+const struct attribute_group tegra194_soc_attr_group = {
+	.attrs = tegra194_soc_attr,
+};
+#endif
+
 struct device * __init tegra_soc_device_register(void)
 {
 	struct soc_device_attribute *attr;

@@ -312,6 +365,7 @@ struct device * __init tegra_soc_device_register(void)
 	attr->family = kasprintf(GFP_KERNEL, "Tegra");
 	attr->revision = kasprintf(GFP_KERNEL, "%d", tegra_sku_info.revision);
 	attr->soc_id = kasprintf(GFP_KERNEL, "%u", tegra_get_chip_id());
+	attr->custom_attr_group = fuse->soc->soc_attr_group;
 
 	dev = soc_device_register(attr);
 	if (IS_ERR(dev)) {

index d4aef9c4a94c..16aaa28573ac 100644
@@ -164,4 +164,5 @@ const struct tegra_fuse_soc tegra20_fuse_soc = {
 	.speedo_init = tegra20_init_speedo_data,
 	.probe = tegra20_fuse_probe,
 	.info = &tegra20_fuse_info,
+	.soc_attr_group = &tegra_soc_attr_group,
 };

index e6037f900fb7..85accef41fa1 100644
@@ -111,6 +111,7 @@ const struct tegra_fuse_soc tegra30_fuse_soc = {
 	.init = tegra30_fuse_init,
 	.speedo_init = tegra30_init_speedo_data,
 	.info = &tegra30_fuse_info,
+	.soc_attr_group = &tegra_soc_attr_group,
 };
 #endif
 

@@ -125,6 +126,7 @@ const struct tegra_fuse_soc tegra114_fuse_soc = {
 	.init = tegra30_fuse_init,
 	.speedo_init = tegra114_init_speedo_data,
 	.info = &tegra114_fuse_info,
+	.soc_attr_group = &tegra_soc_attr_group,
 };
 #endif
 

@@ -205,6 +207,7 @@ const struct tegra_fuse_soc tegra124_fuse_soc = {
 	.info = &tegra124_fuse_info,
 	.lookups = tegra124_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra124_fuse_lookups),
+	.soc_attr_group = &tegra_soc_attr_group,
 };
 #endif
 

@@ -290,6 +293,7 @@ const struct tegra_fuse_soc tegra210_fuse_soc = {
 	.info = &tegra210_fuse_info,
 	.lookups = tegra210_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra210_fuse_lookups),
+	.soc_attr_group = &tegra_soc_attr_group,
 };
 #endif
 

@@ -319,6 +323,7 @@ const struct tegra_fuse_soc tegra186_fuse_soc = {
 	.info = &tegra186_fuse_info,
 	.lookups = tegra186_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra186_fuse_lookups),
+	.soc_attr_group = &tegra_soc_attr_group,
 };
 #endif
 

@@ -348,5 +353,6 @@ const struct tegra_fuse_soc tegra194_fuse_soc = {
 	.info = &tegra194_fuse_info,
 	.lookups = tegra194_fuse_lookups,
 	.num_lookups = ARRAY_SIZE(tegra194_fuse_lookups),
+	.soc_attr_group = &tegra194_soc_attr_group,
 };
 #endif

index 94a059e577a1..9d4fc315a007 100644
@@ -32,6 +32,8 @@ struct tegra_fuse_soc {
 
 	const struct nvmem_cell_lookup *lookups;
 	unsigned int num_lookups;
+
+	const struct attribute_group *soc_attr_group;
 };
 
 struct tegra_fuse {

@@ -64,6 +66,11 @@ void tegra_init_apbmisc(void);
 bool __init tegra_fuse_read_spare(unsigned int spare);
 u32 __init tegra_fuse_read_early(unsigned int offset);
 
+u8 tegra_get_major_rev(void);
+u8 tegra_get_minor_rev(void);
+
+extern const struct attribute_group tegra_soc_attr_group;
+
 #ifdef CONFIG_ARCH_TEGRA_2x_SOC
 void tegra20_init_speedo_data(struct tegra_sku_info *sku_info);
 #endif

@@ -110,6 +117,7 @@ extern const struct tegra_fuse_soc tegra186_fuse_soc;
 
 #ifdef CONFIG_ARCH_TEGRA_194_SOC
 extern const struct tegra_fuse_soc tegra194_fuse_soc;
+extern const struct attribute_group tegra194_soc_attr_group;
 #endif
 
 #endif

index 089d9340564b..44a154ca16b5 100644
@@ -37,6 +37,16 @@ u8 tegra_get_chip_id(void)
 	return (tegra_read_chipid() >> 8) & 0xff;
 }
 
+u8 tegra_get_major_rev(void)
+{
+	return (tegra_read_chipid() >> 4) & 0xf;
+}
+
+u8 tegra_get_minor_rev(void)
+{
+	return (tegra_read_chipid() >> 16) & 0xf;
+}
+
 u32 tegra_read_straps(void)
 {
 	WARN(!chipid, "Tegra ABP MISC not yet available\n");

index 44a154ca16b5..3cdd69d1bd4d 100644
@@ -75,36 +75,32 @@ static const struct of_device_id apbmisc_match[] __initconst = {
 
 void __init tegra_init_revision(void)
 {
-	u32 id, chip_id, minor_rev;
-	int rev;
+	u8 chip_id, minor_rev;
 
-	id = tegra_read_chipid();
-	chip_id = (id >> 8) & 0xff;
-	minor_rev = (id >> 16) & 0xf;
+	chip_id = tegra_get_chip_id();
+	minor_rev = tegra_get_minor_rev();
 
 	switch (minor_rev) {
 	case 1:
-		rev = TEGRA_REVISION_A01;
+		tegra_sku_info.revision = TEGRA_REVISION_A01;
 		break;
 	case 2:
-		rev = TEGRA_REVISION_A02;
+		tegra_sku_info.revision = TEGRA_REVISION_A02;
 		break;
 	case 3:
 		if (chip_id == TEGRA20 && (tegra_fuse_read_spare(18) ||
 					   tegra_fuse_read_spare(19)))
-			rev = TEGRA_REVISION_A03p;
+			tegra_sku_info.revision = TEGRA_REVISION_A03p;
 		else
-			rev = TEGRA_REVISION_A03;
+			tegra_sku_info.revision = TEGRA_REVISION_A03;
 		break;
 	case 4:
-		rev = TEGRA_REVISION_A04;
+		tegra_sku_info.revision = TEGRA_REVISION_A04;
 		break;
 	default:
-		rev = TEGRA_REVISION_UNKNOWN;
+		tegra_sku_info.revision = TEGRA_REVISION_UNKNOWN;
 	}
 
-	tegra_sku_info.revision = rev;
-
 	tegra_sku_info.sku_id = tegra_fuse_read_early(FUSE_SKU_INFO);
 }