platform: tegra: Add kfuse support

This patch adds kfuse support for T186. As a new feature it
introduces a reference counted in-kernel API for enabling and
disabling kfuse sensing

Bug 200117545

Change-Id: I03c6e360c70a9243f1284dc98ccc4122fb993f59
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/797418
(cherry picked from commit d67bf71ef1e6f9e3c9acb6b366f6e8a7a2ff4acf)
Reviewed-on: http://git-master/r/804437
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Stefan Kristiansson <stefank@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/platform/tegra/tegra18_kfuse.h b/include/linux/platform/tegra/tegra18_kfuse.h
new file mode 100644
index 000000000..2ceb706f1
--- /dev/null
+++ b/include/linux/platform/tegra/tegra18_kfuse.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef TEGRA18_KFUSE_H
+#define TEGRA18_KFUSE_H
+
+#include <linux/platform/tegra/tegra_kfuse.h>
+
+struct kfuse;
+
+#ifdef CONFIG_TEGRA_KFUSE
+void tegra_kfuse_disable_sensing(void);
+int tegra_kfuse_enable_sensing(void);
+#else
+
+static inline void tegra_kfuse_disable_sensing(void)
+{
+}
+
+static inline int tegra_kfuse_enable_sensing(void)
+{
+        return -ENOSYS;
+}
+
+#endif
+
+#endif