reset: tegra: add fake reset provider

Bug 1787987

Change-Id: I54e43bfc56e807be00e877c7cb569af8ce374bd4
Signed-off-by: Sivaram Nair <sivaramn@nvidia.com>
Reviewed-on: http://git-master/r/1209435
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Timo Alho <talho@nvidia.com>
GVS: Gerrit_Virtual_Submit

2 files changed, 76 insertions, 0 deletions

diff --git a/drivers/reset/Makefile.t18x b/drivers/reset/Makefile.t18x
index 4dd624eef..94a640234 100644
--- a/drivers/reset/Makefile.t18x
+++ b/drivers/reset/Makefile.t18x
@@ -1 +1,2 @@
 obj-$(CONFIG_ARCH_TEGRA_18x_SOC)        += tegra/
+obj-y                                   += reset-fake.o
diff --git a/drivers/reset/reset-fake.c b/drivers/reset/reset-fake.c
new file mode 100644
index 000000000..9a7a998ab
--- /dev/null
+++ b/drivers/reset/reset-fake.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2016, 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+
+static int fake_reset_op(struct reset_controller_dev *rcdev, unsigned long id)
+{
+        return 0;
+}
+
+static struct reset_control_ops fake_reset_ops = {
+        .assert         = fake_reset_op,
+        .deassert       = fake_reset_op,
+        .reset          = fake_reset_op,
+};
+
+int register_fake_reset(int num_resets, struct platform_device *pdev)
+{
+        struct reset_controller_dev *rcdev;
+
+        rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
+        if (!rcdev)
+                return -ENOMEM;
+
+        rcdev->owner = THIS_MODULE;
+        rcdev->nr_resets = num_resets;
+        rcdev->ops = &fake_reset_ops;
+        rcdev->of_node = pdev->dev.of_node;
+
+        dev_info(&pdev->dev, "registered %d fake resets\n", num_resets);
+
+        return reset_controller_register(rcdev);
+}
+
+static int fake_reset_probe(struct platform_device *pdev)
+{
+        return register_fake_reset(512, pdev);
+}
+
+static const struct of_device_id fake_reset_match[] = {
+        { .compatible = "fake-resets" },
+        { },
+};
+
+static struct platform_driver fake_reset_driver = {
+        .probe = fake_reset_probe,
+        .driver = {
+                .name           = "fake-reset",
+                .owner          = THIS_MODULE,
+                .of_match_table = fake_reset_match,
+        },
+};
+
+static int __init fake_reset_driver_init(void)
+{
+        return platform_driver_register(&fake_reset_driver);
+}
+arch_initcall(fake_reset_driver_init);