linux-kernel - [PATCH] hwmon: (sparx5) Use devm_clk_get

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Date:   Wed, 24 Aug 2022 12:25:13 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-hwmon@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] hwmon: (sparx5) Use devm_clk_get_enabled() helper

The devm_clk_get_enabled() helper:
   - calls devm_clk_get()
   - calls clk_prepare_enable() and registers what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code, the error handling paths and avoid the need of
a dedicated function used with devm_add_action_or_reset().

Based on my test with allyesconfig, this reduces the .o size from:
   text	   data	    bss	    dec	    hex	filename
   2419	   1472	      0	   3891	    f33	drivers/hwmon/sparx5-temp.o
down to:
   2155	   1472	      0	   3627	    e2b	drivers/hwmon/sparx5-temp.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
devm_clk_get_enabled() is new and is part of 6.0-rc1
---
 drivers/hwmon/sparx5-temp.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/hwmon/sparx5-temp.c b/drivers/hwmon/sparx5-temp.c
index 98be48e3a22a..04fd8505e5d6 100644
--- a/drivers/hwmon/sparx5-temp.c
+++ b/drivers/hwmon/sparx5-temp.c
@@ -26,13 +26,6 @@ struct s5_hwmon {
 	struct clk *clk;
 };
 
-static void s5_temp_clk_disable(void *data)
-{
-	struct clk *clk = data;
-
-	clk_disable_unprepare(clk);
-}
-
 static void s5_temp_enable(struct s5_hwmon *hwmon)
 {
 	u32 val = readl(hwmon->base + TEMP_CFG);
@@ -113,7 +106,6 @@ static int s5_temp_probe(struct platform_device *pdev)
 {
 	struct device *hwmon_dev;
 	struct s5_hwmon *hwmon;
-	int ret;
 
 	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
 	if (!hwmon)
@@ -123,19 +115,10 @@ static int s5_temp_probe(struct platform_device *pdev)
 	if (IS_ERR(hwmon->base))
 		return PTR_ERR(hwmon->base);
 
-	hwmon->clk = devm_clk_get(&pdev->dev, NULL);
+	hwmon->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(hwmon->clk))
 		return PTR_ERR(hwmon->clk);
 
-	ret = clk_prepare_enable(hwmon->clk);
-	if (ret)
-		return ret;
-
-	ret = devm_add_action_or_reset(&pdev->dev, s5_temp_clk_disable,
-				       hwmon->clk);
-	if (ret)
-		return ret;
-
 	s5_temp_enable(hwmon);
 
 	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
-- 
2.34.1