From: Sowjanya Komatineni <skomatineni@nvidia.com>
Date: Mon, 27 Jul 2020 13:57:20 -0700
Subject: i2c: tegra: Remove NULL pointer check before
 clk_enable/disable/prepare/unprepare

Git-commit: 7232f53e73839bec4a2747d0c01d29994f9f39b9
Patch-mainline: v5.9-rc1
References: jsc#SLE-15847

clk_enable, clk_disable, clk_prepare, and clk_unprepare APIs have
implementation for checking clk pointer not NULL and clock consumers
can safely call these APIs without NULL pointer check.

So, this patch cleans up Tegra i2c driver to remove explicit checks
before these APIs.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/i2c/busses/i2c-tegra.c |   64 ++++++++++++++---------------------------
 1 file changed, 23 insertions(+), 41 deletions(-)

--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -655,21 +655,17 @@ static int __maybe_unused tegra_i2c_runt
 	if (ret)
 		return ret;
 
-	if (!i2c_dev->hw->has_single_clk_source) {
-		ret = clk_enable(i2c_dev->fast_clk);
-		if (ret < 0) {
-			dev_err(i2c_dev->dev,
-				"Enabling fast clk failed, err %d\n", ret);
-			return ret;
-		}
+	ret = clk_enable(i2c_dev->fast_clk);
+	if (ret < 0) {
+		dev_err(i2c_dev->dev,
+			"Enabling fast clk failed, err %d\n", ret);
+		return ret;
 	}
 
-	if (i2c_dev->slow_clk) {
-		ret = clk_enable(i2c_dev->slow_clk);
-		if (ret < 0) {
-			dev_err(dev, "failed to enable slow clock: %d\n", ret);
-			return ret;
-		}
+	ret = clk_enable(i2c_dev->slow_clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable slow clock: %d\n", ret);
+		return ret;
 	}
 
 	ret = clk_enable(i2c_dev->div_clk);
@@ -688,12 +684,8 @@ static int __maybe_unused tegra_i2c_runt
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
 
 	clk_disable(i2c_dev->div_clk);
-
-	if (i2c_dev->slow_clk)
-		clk_disable(i2c_dev->slow_clk);
-
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_disable(i2c_dev->fast_clk);
+	clk_disable(i2c_dev->slow_clk);
+	clk_disable(i2c_dev->fast_clk);
 
 	return pinctrl_pm_select_idle_state(i2c_dev->dev);
 }
@@ -1716,20 +1708,16 @@ static int tegra_i2c_probe(struct platfo
 
 	platform_set_drvdata(pdev, i2c_dev);
 
-	if (!i2c_dev->hw->has_single_clk_source) {
-		ret = clk_prepare(i2c_dev->fast_clk);
-		if (ret < 0) {
-			dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
-			return ret;
-		}
+	ret = clk_prepare(i2c_dev->fast_clk);
+	if (ret < 0) {
+		dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
+		return ret;
 	}
 
-	if (i2c_dev->slow_clk) {
-		ret = clk_prepare(i2c_dev->slow_clk);
-		if (ret < 0) {
-			dev_err(dev, "failed to prepare slow clock: %d\n", ret);
-			goto unprepare_fast_clk;
-		}
+	ret = clk_prepare(i2c_dev->slow_clk);
+	if (ret < 0) {
+		dev_err(dev, "failed to prepare slow clock: %d\n", ret);
+		goto unprepare_fast_clk;
 	}
 
 	if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ &&
@@ -1843,12 +1831,10 @@ unprepare_div_clk:
 	clk_unprepare(i2c_dev->div_clk);
 
 unprepare_slow_clk:
-	if (i2c_dev->is_vi)
-		clk_unprepare(i2c_dev->slow_clk);
+	clk_unprepare(i2c_dev->slow_clk);
 
 unprepare_fast_clk:
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_unprepare(i2c_dev->fast_clk);
+	clk_unprepare(i2c_dev->fast_clk);
 
 	return ret;
 }
@@ -1867,12 +1853,8 @@ static int tegra_i2c_remove(struct platf
 		tegra_i2c_runtime_suspend(&pdev->dev);
 
 	clk_unprepare(i2c_dev->div_clk);
-
-	if (i2c_dev->slow_clk)
-		clk_unprepare(i2c_dev->slow_clk);
-
-	if (!i2c_dev->hw->has_single_clk_source)
-		clk_unprepare(i2c_dev->fast_clk);
+	clk_unprepare(i2c_dev->slow_clk);
+	clk_unprepare(i2c_dev->fast_clk);
 
 	tegra_i2c_release_dma(i2c_dev);
 	return 0;