From: Philipp Zabel Date: Thu, 19 Oct 2023 20:07:02 +0000 (+0200) Subject: pwm: stm32: Use hweight32 in stm32_pwm_detect_channels X-Git-Tag: v6.6.14~267 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5eb8da9b3ef7356b3526939ce4fafe5fedcc9e79;p=platform%2Fkernel%2Flinux-starfive.git pwm: stm32: Use hweight32 in stm32_pwm_detect_channels [ Upstream commit 41fa8f57c0d269243fe3bde2bce71e82c884b9ad ] Use hweight32() to count the CCxE bits in stm32_pwm_detect_channels(). Since the return value is assigned to chip.npwm, change it to unsigned int as well. Signed-off-by: Philipp Zabel Signed-off-by: Uwe Kleine-König Reviewed-by: Fabrice Gasnier Signed-off-by: Thierry Reding Stable-dep-of: 19f1016ea960 ("pwm: stm32: Fix enable count for clk in .probe()") Signed-off-by: Sasha Levin --- diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c index 3d6be77..0c7781f 100644 --- a/drivers/pwm/pwm-stm32.c +++ b/drivers/pwm/pwm-stm32.c @@ -579,10 +579,9 @@ static void stm32_pwm_detect_complementary(struct stm32_pwm *priv) priv->have_complementary_output = (ccer != 0); } -static int stm32_pwm_detect_channels(struct stm32_pwm *priv) +static unsigned int stm32_pwm_detect_channels(struct stm32_pwm *priv) { u32 ccer; - int npwm = 0; /* * If channels enable bits don't exist writing 1 will have no @@ -592,19 +591,7 @@ static int stm32_pwm_detect_channels(struct stm32_pwm *priv) regmap_read(priv->regmap, TIM_CCER, &ccer); regmap_clear_bits(priv->regmap, TIM_CCER, TIM_CCER_CCXE); - if (ccer & TIM_CCER_CC1E) - npwm++; - - if (ccer & TIM_CCER_CC2E) - npwm++; - - if (ccer & TIM_CCER_CC3E) - npwm++; - - if (ccer & TIM_CCER_CC4E) - npwm++; - - return npwm; + return hweight32(ccer & TIM_CCER_CCXE); } static int stm32_pwm_probe(struct platform_device *pdev)