linux-kernel - [PATCH 3/3] pwm: pxa: Remove clk_enabled field from struct pxa_pwm

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Date:	Sun, 31 Mar 2013 23:04:31 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	Eric Miao <eric.y.miao@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] pwm: pxa: Remove clk_enabled field from struct
 pxa_pwm_chip

clk_enable/clk_disable maintain an enable_count, clk_prepare and clk_unprepare
also maintain a prepare_count. These APIs will do prepare/enable when the first
user calling these APIs, and do disable/unprepare when the corresponding counter
reach 0. Thus We don't need to maintain a clk_enabled counter here.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/pwm/pwm-pxa.c |   16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 20370e6..b789882 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -48,7 +48,6 @@ struct pxa_pwm_chip {
 	struct device	*dev;
 
 	struct clk	*clk;
-	int		clk_enabled;
 	void __iomem	*mmio_base;
 };
 
@@ -108,24 +107,15 @@ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 static int pxa_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
-	int rc = 0;
 
-	if (!pc->clk_enabled) {
-		rc = clk_prepare_enable(pc->clk);
-		if (!rc)
-			pc->clk_enabled++;
-	}
-	return rc;
+	return clk_prepare_enable(pc->clk);
 }
 
 static void pxa_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
 
-	if (pc->clk_enabled) {
-		clk_disable_unprepare(pc->clk);
-		pc->clk_enabled--;
-	}
+	clk_disable_unprepare(pc->clk);
 }
 
 static struct pwm_ops pxa_pwm_ops = {
@@ -152,8 +142,6 @@ static int pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(pwm->clk))
 		return PTR_ERR(pwm->clk);
 
-	pwm->clk_enabled = 0;
-
 	pwm->chip.dev = &pdev->dev;
 	pwm->chip.ops = &pxa_pwm_ops;
 	pwm->chip.base = -1;
-- 
1.7.10.4



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