linux-kernel - [PATCH V2 1/2] pwm: pwm-tiecap: Add support for configuring polarity of PWM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1346908203-10632-2-git-send-email-avinashphilip@ti.com>
Date:	Thu, 6 Sep 2012 10:40:02 +0530
From:	"Philip, Avinash" <avinashphilip@...com>
To:	<thierry.reding@...onic-design.de>
CC:	<linux-kernel@...r.kernel.org>, <nsekhar@...com>,
	<gururaja.hebbar@...com>
Subject: [PATCH V2 1/2] pwm: pwm-tiecap: Add support for configuring polarity of PWM

ECAP APWM hardware supports polarity configuration of PWM output.
This commit adds support for polarity configuration of ECAP APWM.

Signed-off-by: Philip, Avinash <avinashphilip@...com>
---
:100644 100644 4b66889... a3d21e7... M	drivers/pwm/pwm-tiecap.c
 drivers/pwm/pwm-tiecap.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 4b66889..a3d21e7 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -32,6 +32,7 @@
 #define CAP3			0x10
 #define CAP4			0x14
 #define ECCTL2			0x2A
+#define ECCTL2_APWM_POL_LOW	BIT(10)
 #define ECCTL2_APWM_MODE	BIT(9)
 #define ECCTL2_SYNC_SEL_DISA	(BIT(7) | BIT(6))
 #define ECCTL2_TSCTR_FREERUN	BIT(4)
@@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	return 0;
 }
 
+static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
+		enum pwm_polarity polarity)
+{
+	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
+	unsigned short reg_val;
+
+	pm_runtime_get_sync(pc->chip.dev);
+	reg_val = readw(pc->mmio_base + ECCTL2);
+	if (polarity == PWM_POLARITY_INVERSED)
+		/* Duty cycle defines LOW period of PWM */
+		reg_val |= ECCTL2_APWM_POL_LOW;
+	else
+		/* Duty cycle defines HIGH period of PWM */
+		reg_val &= ~ECCTL2_APWM_POL_LOW;
+
+	writew(reg_val, pc->mmio_base + ECCTL2);
+	pm_runtime_put_sync(pc->chip.dev);
+	return 0;
+}
+
 static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
@@ -157,6 +178,7 @@ static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 static const struct pwm_ops ecap_pwm_ops = {
 	.free		= ecap_pwm_free,
 	.config		= ecap_pwm_config,
+	.set_polarity	= ecap_pwm_set_polarity,
 	.enable		= ecap_pwm_enable,
 	.disable	= ecap_pwm_disable,
 	.owner		= THIS_MODULE,
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/