linux-kernel - [PATCH] bus: bt1-apb: Use devm_clk_get

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Date:   Fri, 30 Dec 2022 16:34:34 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] bus: bt1-apb: 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>
---
 drivers/bus/bt1-apb.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/bus/bt1-apb.c b/drivers/bus/bt1-apb.c
index 63b1b4a76671..9ed8d10c489b 100644
--- a/drivers/bus/bt1-apb.c
+++ b/drivers/bus/bt1-apb.c
@@ -186,34 +186,13 @@ static int bt1_apb_request_rst(struct bt1_apb *apb)
 	return ret;
 }
 
-static void bt1_apb_disable_clk(void *data)
-{
-	struct bt1_apb *apb = data;
-
-	clk_disable_unprepare(apb->pclk);
-}
-
 static int bt1_apb_request_clk(struct bt1_apb *apb)
 {
-	int ret;
-
-	apb->pclk = devm_clk_get(apb->dev, "pclk");
+	apb->pclk = devm_clk_get_enabled(apb->dev, "pclk");
 	if (IS_ERR(apb->pclk))
 		return dev_err_probe(apb->dev, PTR_ERR(apb->pclk),
 				     "Couldn't get APB clock descriptor\n");
 
-	ret = clk_prepare_enable(apb->pclk);
-	if (ret) {
-		dev_err(apb->dev, "Couldn't enable the APB clock\n");
-		return ret;
-	}
-
-	ret = devm_add_action_or_reset(apb->dev, bt1_apb_disable_clk, apb);
-	if (ret) {
-		dev_err(apb->dev, "Can't add APB EHB clocks disable action\n");
-		return ret;
-	}
-
 	apb->rate = clk_get_rate(apb->pclk);
 	if (!apb->rate) {
 		dev_err(apb->dev, "Invalid clock rate\n");
-- 
2.34.1