[lkml]   [2020]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v7 07/13] pwm: imx27: Use 64-bit division macros for period and duty cycle
Because period and duty cycle are defined in the PWM framework structs
as ints with units of nanoseconds, the maximum time duration that can be
set is limited to ~2.147 seconds. Redefining them as u64 values will
enable larger time durations to be set.

As a first step, prepare drivers to handle the switch to u64 period and
duty_cycle by replacing division operations involving pwm period and duty cycle
with their 64-bit equivalents as appropriate. The actual switch to u64 period
and duty_cycle follows as a separate patch.

Where the dividend is 64-bit but the divisor is 32-bit, use *_ULL
- div_u64

Where the divisor is 64-bit (dividend may be 32-bit or 64-bit), use
DIV64_* macros:
- div64_u64

Cc: Shawn Guo <>
Cc: Sascha Hauer <>
Cc: Pengutronix Kernel Team <>
Cc: Fabio Estevam <>
Cc: NXP Linux Team <>

Signed-off-by: Guru Das Srinagesh <>
drivers/pwm/pwm-imx27.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c
index 35a7ac42..b7d38d0 100644
--- a/drivers/pwm/pwm-imx27.c
+++ b/drivers/pwm/pwm-imx27.c
@@ -208,7 +208,7 @@ static void pwm_imx27_wait_fifo_slot(struct pwm_chip *chip,
sr = readl(imx->mmio_base + MX3_PWMSR);
if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) {
- period_ms = DIV_ROUND_UP(pwm_get_period(pwm),
+ period_ms = DIV_ROUND_UP_ULL(pwm_get_period(pwm),

@@ -240,8 +240,7 @@ static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm,

period_cycles /= prescale;
c = (unsigned long long)period_cycles * state->duty_cycle;
- do_div(c, state->period);
- duty_cycles = c;
+ duty_cycles = div64_u64(c, state->period);

* according to imx pwm RM, the real period value should be PERIOD
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
 \ /
  Last update: 2020-03-09 20:36    [W:0.117 / U:6.876 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site