soc/tegra: Implement runtime check for Tegra SoCs

Subsequent patches will move some of the initialization code from SoC
setup code to regular initcalls. To prevent breakage on other SoCs in
multi-platform builds, these initcalls need to check that they indeed
run on Tegra.

Signed-off-by: Thierry Reding <treding@nvidia.com>

3 files changed, 46 insertions, 0 deletions

diff --git a/drivers/soc/tegra/Makefile b/drivers/soc/tegra/Makefile
index 236600f91bb3..db34987ed9dc 100644
--- a/drivers/soc/tegra/Makefile
+++ b/drivers/soc/tegra/Makefile
@@ -1 +1,3 @@
 obj-$(CONFIG_ARCH_TEGRA) += fuse/
+
+obj-$(CONFIG_ARCH_TEGRA) += common.o
diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
new file mode 100644
index 000000000000..a71cb74f3674
--- /dev/null
+++ b/drivers/soc/tegra/common.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2014 NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/of.h>
+
+#include <soc/tegra/common.h>
+
+static const struct of_device_id tegra_machine_match[] = {
+        { .compatible = "nvidia,tegra20", },
+        { .compatible = "nvidia,tegra30", },
+        { .compatible = "nvidia,tegra114", },
+        { .compatible = "nvidia,tegra124", },
+        { }
+};
+
+bool soc_is_tegra(void)
+{
+        struct device_node *root;
+
+        root = of_find_node_by_path("/");
+        if (!root)
+                return false;
+
+        return of_match_node(tegra_machine_match, root) != NULL;
+}
diff --git a/include/soc/tegra/common.h b/include/soc/tegra/common.h
new file mode 100644
index 000000000000..fc13a9a134e9
--- /dev/null
+++ b/include/soc/tegra/common.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __SOC_TEGRA_COMMON_H__
+#define __SOC_TEGRA_COMMON_H__
+
+bool soc_is_tegra(void);
+
+#endif /* __SOC_TEGRA_COMMON_H__ */