gpu: nvgpu: abstract dt functions

Added nvgpu_dt_read_u32_index() for now.

Jira VFND-4870

Change-Id: I3e51c408dfba3864372c515ba5d2c77708a489c8
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683008
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

3 files changed, 58 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index c75e1417..9f58d6ef 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -62,6 +62,7 @@ nvgpu-y += \
         common/linux/sim_pci.o \
         common/linux/os_sched.o \
         common/linux/nvlink.o \
+        common/linux/dt.o \
         common/mm/nvgpu_allocator.o \
         common/mm/bitmap_allocator.o \
         common/mm/buddy_allocator.o \
diff --git a/drivers/gpu/nvgpu/common/linux/dt.c b/drivers/gpu/nvgpu/common/linux/dt.c
new file mode 100644
index 00000000..88e391e3
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/dt.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, 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 <nvgpu/dt.h>
+#include <linux/of.h>
+
+#include "os_linux.h"
+
+int nvgpu_dt_read_u32_index(struct gk20a *g, const char *name,
+                                u32 index, u32 *value)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct device_node *np = dev->of_node;
+
+        return of_property_read_u32_index(np, name, index, value);
+}
diff --git a/drivers/gpu/nvgpu/include/nvgpu/dt.h b/drivers/gpu/nvgpu/include/nvgpu/dt.h
new file mode 100644
index 00000000..b5fdbfcd
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/dt.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/types.h>
+
+struct gk20a;
+
+int nvgpu_dt_read_u32_index(struct gk20a *g, const char *name,
+                                u32 index, u32 *value);