From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-pwm@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
"Duc Nguyen" <duc.nguyen.ub@renesas.com>,
"Wolfram Sang" <wsa+renesas@sang-engineering.com>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Lee Jones" <lee.jones@linaro.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] pwm: renesas-tpu: don't allow no duty if duty_ns is given
Date: Wed, 15 Sep 2021 08:55:41 +0200 [thread overview]
Message-ID: <20210915065542.1897-3-wsa+renesas@sang-engineering.com> (raw)
In-Reply-To: <20210915065542.1897-1-wsa+renesas@sang-engineering.com>
From: Duc Nguyen <duc.nguyen.ub@renesas.com>
We have special code if duty_ns is 0. But if non-zero is given, then the
calculation should not result in zero duty.
Signed-off-by: Duc Nguyen <duc.nguyen.ub@renesas.com>
[wsa: split and reworded commit message]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
drivers/pwm/pwm-renesas-tpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c
index 754440194650..bb51156e4bda 100644
--- a/drivers/pwm/pwm-renesas-tpu.c
+++ b/drivers/pwm/pwm-renesas-tpu.c
@@ -275,7 +275,7 @@ static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
if (duty_ns) {
duty = clk_rate / prescalers[prescaler]
/ (NSEC_PER_SEC / duty_ns);
- if (duty > period)
+ if (duty > period || duty == 0)
return -EINVAL;
} else {
duty = 0;
--
2.30.2
next prev parent reply other threads:[~2021-09-15 6:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-15 6:55 [PATCH 0/2] pwm: renesas-tpu: minor improvements Wolfram Sang
2021-09-15 6:55 ` [PATCH 1/2] pwm: renesas-tpu: better errno for impossible rates Wolfram Sang
2021-09-15 9:36 ` Sergei Shtylyov
2021-09-17 8:25 ` Uwe Kleine-König
2021-09-20 9:08 ` Wolfram Sang
2021-09-15 6:55 ` Wolfram Sang [this message]
2021-09-16 16:47 ` [PATCH 2/2] pwm: renesas-tpu: don't allow no duty if duty_ns is given Uwe Kleine-König
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