linux-kernel - [PATCH v3 5/6] pwm: mediatek: add PWM_CLK_DIV

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Message-ID: <1498802721-32455-6-git-send-email-zhi.mao@mediatek.com>
Date:   Fri, 30 Jun 2017 14:05:20 +0800
From:   Zhi Mao <zhi.mao@...iatek.com>
To:     <john@...ozen.org>, Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-pwm@...r.kernel.org>
CC:     <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <zhi.mao@...iatek.com>,
        <yingjoe.chen@...iatek.com>, <yt.shen@...iatek.com>,
        <sean.wang@...iatek.com>, <zhenbao.liu@...iatek.com>
Subject: [PATCH v3 5/6] pwm: mediatek: add PWM_CLK_DIV_MAX

1. Replace "7" with "PWM_CLK_DIV_MAX" in function:mtk_pwm_config()
to improve the code readablity.
2. add pwm clk disable in function:mtk_pwm_config()
for error parameter checking case.

Signed-off-by: Zhi Mao <zhi.mao@...iatek.com>
---
 drivers/pwm/pwm-mediatek.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index 554a042..1d78ab1 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -30,6 +30,8 @@
 #define PWMDWIDTH		0x2c
 #define PWMTHRES		0x30
 
+#define PWM_CLK_DIV_MAX		7
+
 enum {
 	MTK_CLK_MAIN = 0,
 	MTK_CLK_TOP,
@@ -130,8 +132,11 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 		clkdiv++;
 	}
 
-	if (clkdiv > 7)
+	if (clkdiv > PWM_CLK_DIV_MAX) {
+		mtk_pwm_clk_disable(chip, pwm);
+		dev_err(chip->dev, "period %d not supported\n", period_ns);
 		return -EINVAL;
+	}
 
 	mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
 	mtk_pwm_writel(pc, pwm->hwpwm, PWMDWIDTH, period_ns / resolution);
-- 
1.7.9.5