From: Guru Das Srinagesh <gurus@codeaurora.org>
To: linux-pwm@vger.kernel.org
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Subbaraman Narayanamurthy" <subbaram@codeaurora.org>,
"David Collins" <collinsd@codeaurora.org>,
linux-kernel@vger.kernel.org,
"Guru Das Srinagesh" <gurus@codeaurora.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@kernel.org>,
linux-clk@vger.kernel.org
Subject: [PATCH v13 10/11] clk: pwm: Use 64-bit division function
Date: Tue, 21 Apr 2020 19:57:22 -0700 [thread overview]
Message-ID: <0efec2ac3e9d9d8d7d71e29c9ab7cdcbb02d137d.1587523702.git.gurus@codeaurora.org> (raw)
In-Reply-To: <cover.1587523702.git.gurus@codeaurora.org>
In-Reply-To: <cover.1587523702.git.gurus@codeaurora.org>
Since the PWM framework is switching struct pwm_args.period's datatype
to u64, prepare for this transition by using div64_u64 to handle a
64-bit divisor.
Also ensure that divide-by-zero (with fixed_rate as denominator) does
not happen with an explicit check with probe failure as a consequence.
To: David Laight <David.Laight@ACULAB.COM>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
drivers/clk/clk-pwm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/clk-pwm.c b/drivers/clk/clk-pwm.c
index 87fe0b0e..86f2e2d 100644
--- a/drivers/clk/clk-pwm.c
+++ b/drivers/clk/clk-pwm.c
@@ -89,7 +89,12 @@ static int clk_pwm_probe(struct platform_device *pdev)
}
if (of_property_read_u32(node, "clock-frequency", &clk_pwm->fixed_rate))
- clk_pwm->fixed_rate = NSEC_PER_SEC / pargs.period;
+ clk_pwm->fixed_rate = div64_u64(NSEC_PER_SEC, pargs.period);
+
+ if (!clk_pwm->fixed_rate) {
+ dev_err(&pdev->dev, "fixed_rate cannot be zero\n");
+ return -EINVAL;
+ }
if (pargs.period != NSEC_PER_SEC / clk_pwm->fixed_rate &&
pargs.period != DIV_ROUND_UP(NSEC_PER_SEC, clk_pwm->fixed_rate)) {
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-04-22 2:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1587523702.git.gurus@codeaurora.org>
2020-04-22 2:57 ` [PATCH v13 01/11] drm/i915: Use 64-bit division macro Guru Das Srinagesh
2020-04-24 6:17 ` Jani Nikula
2020-04-24 22:17 ` Guru Das Srinagesh
2020-04-27 13:48 ` Jani Nikula
2020-04-22 2:57 ` [PATCH v13 02/11] hwmon: pwm-fan: " Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 03/11] ir-rx51: " Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 04/11] pwm: clps711x: Cast period to u32 before use as divisor Guru Das Srinagesh
2020-04-23 9:30 ` Geert Uytterhoeven
2020-04-24 22:21 ` Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 05/11] pwm: pwm-imx-tpm: Use 64-bit division macro Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 06/11] pwm: imx27: Use 64-bit division macro and function Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 07/11] pwm: sifive: Use 64-bit division macro Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 08/11] pwm: sun4i: Use nsecs_to_jiffies to avoid a division Guru Das Srinagesh
2020-04-22 2:57 ` [PATCH v13 09/11] backlight: pwm_bl: Use 64-bit division function Guru Das Srinagesh
2020-05-26 7:00 ` Lee Jones
2020-04-22 2:57 ` Guru Das Srinagesh [this message]
2020-04-22 2:57 ` [PATCH v13 11/11] pwm: core: Convert period and duty cycle to u64 Guru Das Srinagesh
2020-05-22 13:26 ` Uwe Kleine-König
[not found] ` <20200423114857.GG3612@dell>
[not found] ` <20200423215306.GA8670@codeaurora.org>
[not found] ` <20200424064303.GJ3612@dell>
[not found] ` <20200424221422.GA31118@codeaurora.org>
[not found] ` <20200427064434.GA3559@dell>
2020-05-20 23:15 ` [PATCH v13 00/11] Convert PWM " Guru Das Srinagesh
2020-05-21 7:15 ` Lee Jones
2020-05-22 11:16 ` Thierry Reding
2020-05-22 11:31 ` Lee Jones
2020-05-22 12:50 ` Thierry Reding
2020-05-22 22:59 ` Guru Das Srinagesh
2020-05-26 6:59 ` Lee Jones
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