From 19d543a9720065b9e84d1534a8593026e4227e78 Mon Sep 17 00:00:00 2001
From: Zhiqiang Tu <ztu@codeaurora.org>
Date: Tue, 13 Feb 2018 14:30:27 +0800
Subject: [PATCH] clk: msm: Add reset support in dummy clock driver

Some pass-through devices on msm8996 virtual platform need
dummy clock reset.

Change-Id: I88f4028fe56e428f12b2149a4413c3328da880bb
Signed-off-by: Ramachandran Venkataramani <ramavenk@codeaurora.org>
Signed-off-by: Zhiqiang Tu <ztu@codeaurora.org>
---
 drivers/clk/msm/clock-dummy.c | 55 +++++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/msm/clock-dummy.c b/drivers/clk/msm/clock-dummy.c
index e874fccc7f6c..e3a0181f1cc4 100644
--- a/drivers/clk/msm/clock-dummy.c
+++ b/drivers/clk/msm/clock-dummy.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2011,2013-2014 The Linux Foundation. All rights reserved.
+/* Copyright (c) 2011,2013-2014,2018 The Linux Foundation. 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 and
@@ -14,6 +14,53 @@
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <soc/qcom/msm-clock-controller.h>
+#include <linux/reset-controller.h>
+
+#define DUMMY_RESET_NR	20
+
+static int dummy_reset_assert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	return 0;
+}
+
+static int dummy_reset_deassert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	return 0;
+}
+
+static int dummy_reset(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	return 0;
+}
+
+static struct reset_control_ops dummy_reset_ops = {
+	.reset = dummy_reset,
+	.assert = dummy_reset_assert,
+	.deassert = dummy_reset_deassert,
+};
+
+static int dummy_reset_controller_register(struct platform_device *pdev)
+{
+	struct reset_controller_dev *prcdev;
+	int ret = 0;
+
+	prcdev = devm_kzalloc(&pdev->dev, sizeof(*prcdev), GFP_KERNEL);
+	if (!prcdev)
+		return -ENOMEM;
+
+	prcdev->of_node = pdev->dev.of_node;
+	prcdev->ops = &dummy_reset_ops;
+	prcdev->owner = pdev->dev.driver->owner;
+	prcdev->nr_resets = DUMMY_RESET_NR;
+
+	ret = reset_controller_register(prcdev);
+	if (ret)
+		dev_err(&pdev->dev, "Failed to register reset controller\n");
+
+	return ret;
+}
 
 static int dummy_clk_reset(struct clk *clk, enum clk_reset_action action)
 {
@@ -99,7 +146,11 @@ static int msm_clock_dummy_probe(struct platform_device *pdev)
 
 	ret = of_clk_add_provider(pdev->dev.of_node, of_dummy_get, NULL);
 	if (ret)
-		return -ENOMEM;
+		return ret;
+
+	ret = dummy_reset_controller_register(pdev);
+	if (ret)
+		return ret;
 
 	dev_info(&pdev->dev, "Registered DUMMY provider.\n");
 	return ret;