linux-kernel - [PATCH] watchdog: of_xilinx_wdt: Use devm_clk_get

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Message-Id: <71551233b18f57037be9e75d2d6428534d7572d3.1672491065.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 31 Dec 2022 13:51:20 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] watchdog: of_xilinx_wdt: 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 and avoids the need of a dedicated function used
with devm_add_action_or_reset().

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Note that the order of operations is slightly modified by this patch. The
clk is now prepare_enable()'ed before calling clk_get_rate().
---
 drivers/watchdog/of_xilinx_wdt.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
index 3318544366b8..f184843380a3 100644
--- a/drivers/watchdog/of_xilinx_wdt.c
+++ b/drivers/watchdog/of_xilinx_wdt.c
@@ -193,7 +193,7 @@ static int xwdt_probe(struct platform_device *pdev)
 
 	watchdog_set_nowayout(xilinx_wdt_wdd, enable_once);
 
-	xdev->clk = devm_clk_get(dev, NULL);
+	xdev->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(xdev->clk)) {
 		if (PTR_ERR(xdev->clk) != -ENOENT)
 			return PTR_ERR(xdev->clk);
@@ -211,15 +211,6 @@ static int xwdt_probe(struct platform_device *pdev)
 				 "The watchdog clock freq cannot be obtained\n");
 	} else {
 		pfreq = clk_get_rate(xdev->clk);
-		rc = clk_prepare_enable(xdev->clk);
-		if (rc) {
-			dev_err(dev, "unable to enable clock\n");
-			return rc;
-		}
-		rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare,
-					      xdev->clk);
-		if (rc)
-			return rc;
 	}
 
 	/*
-- 
2.34.1