From: Gaetan Hug <ghug@induct.be>
To: <thierry.reding@gmail.com>
Cc: <linux-pwm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Gaetan Hug <ghug@induct.be>
Subject: [PATCH 1/1] fixing pwm-mxs period divider computation
Date: Wed, 18 Feb 2015 09:18:56 +0100 [thread overview]
Message-ID: <1424247536-16476-2-git-send-email-ghug@induct.be> (raw)
In-Reply-To: <1424247536-16476-1-git-send-email-ghug@induct.be>
---
drivers/pwm/pwm-mxs.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-mxs.c b/drivers/pwm/pwm-mxs.c
index f75ecb0..bbb2f8a 100644
--- a/drivers/pwm/pwm-mxs.c
+++ b/drivers/pwm/pwm-mxs.c
@@ -52,15 +52,18 @@ static int mxs_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long rate;
unsigned long long c;
+ unsigned const int cdiv[PERIOD_CDIV_MAX] = {1, 2, 4, 8, 16, 64, 256, 1024};
+
rate = clk_get_rate(mxs->clk);
+
while (1) {
- c = rate / (1 << div);
+ c = rate / cdiv[div];
c = c * period_ns;
do_div(c, 1000000000);
if (c < PERIOD_PERIOD_MAX)
break;
div++;
- if (div > PERIOD_CDIV_MAX)
+ if (div >= PERIOD_CDIV_MAX)
return -EINVAL;
}
--
1.7.10.4
next prev parent reply other threads:[~2015-02-18 8:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-18 8:18 [PATCH 0/1] fix for " Gaetan Hug
2015-02-18 8:18 ` Gaetan Hug [this message]
2015-02-18 12:11 ` [PATCH 1/1] fixing " Thierry Reding
2015-02-18 12:08 ` [PATCH 0/1] fix for " Thierry Reding
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