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From:   Florian Fainelli <florian.fainelli@broadcom.com>
To:     linux-pwm@vger.kernel.org
Cc:     Florian Fainelli <florian.fainelli@broadcom.com>,
        Angus Clark <angus.clark@broadcom.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>, Ray Jui <rjui@broadcom.com>,
        Scott Branden <sbranden@broadcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@broadcom.com>,
        linux-rpi-kernel@lists.infradead.org (moderated list:BROADCOM
        BCM2711/BCM2835 ARM ARCHITECTURE),
        linux-arm-kernel@lists.infradead.org (moderated list:BROADCOM
        BCM2711/BCM2835 ARM ARCHITECTURE),
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v3] pwm: bcm2835: Add support for suspend/resume
Date:   Wed, 11 Oct 2023 10:07:17 -0700
Message-Id: <20231011170717.3738712-1-florian.fainelli@broadcom.com>
MIME-Version: 1.0
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        boundary="0000000000003a5747060773db2e"
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--0000000000003a5747060773db2e
Content-Transfer-Encoding: 8bit

Similar to other drivers, we need to make sure that the clock is
disabled during suspend and re-enabled during resume.

Reported-by: Angus Clark <angus.clark@broadcom.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
Changes in v3:

- removed __maybe_unused and use pm_ptr()

Changes in v2:

- use DEFINE_SIMPLE_DEV_PM_OPS as suggested by Uwe

 drivers/pwm/pwm-bcm2835.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c
index bdfc2a5ec0d6..21ed2f2ebdd0 100644
--- a/drivers/pwm/pwm-bcm2835.c
+++ b/drivers/pwm/pwm-bcm2835.c
@@ -182,6 +182,25 @@ static void bcm2835_pwm_remove(struct platform_device *pdev)
 	clk_disable_unprepare(pc->clk);
 }
 
+static int bcm2835_pwm_suspend(struct device *dev)
+{
+	struct bcm2835_pwm *pc = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(pc->clk);
+
+	return 0;
+}
+
+static int bcm2835_pwm_resume(struct device *dev)
+{
+	struct bcm2835_pwm *pc = dev_get_drvdata(dev);
+
+	return clk_prepare_enable(pc->clk);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(bcm2835_pwm_pm_ops, bcm2835_pwm_suspend,
+				bcm2835_pwm_resume);
+
 static const struct of_device_id bcm2835_pwm_of_match[] = {
 	{ .compatible = "brcm,bcm2835-pwm", },
 	{ /* sentinel */ }
@@ -192,6 +211,7 @@ static struct platform_driver bcm2835_pwm_driver = {
 	.driver = {
 		.name = "bcm2835-pwm",
 		.of_match_table = bcm2835_pwm_of_match,
+		.pm = pm_ptr(&bcm2835_pwm_pm_ops),
 	},
 	.probe = bcm2835_pwm_probe,
 	.remove_new = bcm2835_pwm_remove,
-- 
2.34.1


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