[PATCH] pwm: core: Use pwm->args.polarity to setup PWM_POLARITY_INVERSED

From	Lukasz Majewski <l.majewski@majess.pl>
Newsgroups	linux.kernel
Subject	[PATCH] pwm: core: Use pwm->args.polarity to setup PWM_POLARITY_INVERSED
Date	2016-10-06 09:00 +0200
Message-ID	<spaOR-4Wl-1@gated-at.bofh.it> (permalink)
References	<spaOR-4Wl-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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The pwm_set_polarity() function finally calls pwm_apply_state(), which
in turn requires state->duty_cycle and state->period properly set.

In the moment when polarity is set, the PWM is disabled and not configured.
For that reason both above variables are set to 0 and the polarity is not
set.

To be sure that polarity is setup, one needs to set pwm->args.polarity, which
controls MX3_PWMCR_POUTC bit setting at imx_pwm_config_v2().

Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
---
This patch should be applied on top of:

"[v2,2/6] pwm: core: make the PWM_POLARITY flag in DTB optional"

http://patchwork.ozlabs.org/patch/677330/

---
 drivers/pwm/core.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 1f62668..6cd6004 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -153,13 +153,11 @@ of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
 		return pwm;
 
 	pwm->args.period = args->args[1];
+	pwm->args.polarity = PWM_POLARITY_NORMAL;
 
-	if (args->args_count > 2) {
+	if (args->args_count > 2)
 		if (args->args[2] & PWM_POLARITY_INVERTED)
-			pwm_set_polarity(pwm, PWM_POLARITY_INVERSED);
-		else
-			pwm_set_polarity(pwm, PWM_POLARITY_NORMAL);
-	}
+			pwm->args.polarity = PWM_POLARITY_INVERSED;
 
 	return pwm;
 }
-- 
2.1.4

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[PATCH] pwm: core: Use pwm->args.polarity to setup PWM_POLARITY_INVERSED Lukasz Majewski <l.majewski@majess.pl> - 2016-10-06 09:00 +0200

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