linux-kernel - [PATCH v4 2/3] clocksource: timer-cadence-ttc: Support TTC device configured as PWM

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Message-ID: <20250115113556.2832282-3-mubin.sayyed@amd.com>
Date: Wed, 15 Jan 2025 17:05:55 +0530
From: Mubin Sayyed <mubin.sayyed@....com>
To: <krzysztof.kozlowski+dt@...aro.org>, <daniel.lezcano@...aro.org>,
	<tglx@...utronix.de>, <michal.simek@....com>, <ukleinek@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-pwm@...r.kernel.org>, <git@....com>, Mubin Sayyed
	<mubin.sayyed@....com>
Subject: [PATCH v4 2/3] clocksource: timer-cadence-ttc: Support TTC device configured as PWM

TTC device can act either as clocksource/clockevent or PWM generator,
it would be decided by pwm-cells property. If pwm-cells property is
present in TTC node, it would be treated as PWM device, and clocksource
driver just calls probe function for PWM functionality, so that TTC
device would be registered with PWM framework.

Signed-off-by: Mubin Sayyed <mubin.sayyed@....com>
---
Changes for v4:
    - In case of pwm-cells property call probe function for PWM
      feature instead of returning error.
Changes for v3:
    - None
Changes for v2:
    - Added comment regarding pwm-cells property
---
 drivers/clocksource/timer-cadence-ttc.c | 34 +++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/clocksource/timer-cadence-ttc.c b/drivers/clocksource/timer-cadence-ttc.c
index 2f33d4c40153..c5ecad9332c9 100644
--- a/drivers/clocksource/timer-cadence-ttc.c
+++ b/drivers/clocksource/timer-cadence-ttc.c
@@ -35,6 +35,10 @@
  * obtained from device tree. The pre-scaler of 32 is used.
  */
 
+struct ttc_timer_config {
+	bool is_pwm_mode;
+};
+
 /**
  * struct ttc_timer - This definition defines local timer structure
  *
@@ -453,6 +457,7 @@ static int __init ttc_setup_clockevent(struct clk *clk,
 
 static int __init ttc_timer_probe(struct platform_device *pdev)
 {
+	struct ttc_timer_config *ttc_config;
 	unsigned int irq;
 	void __iomem *timer_baseaddr;
 	struct clk *clk_cs, *clk_ce;
@@ -461,6 +466,24 @@ static int __init ttc_timer_probe(struct platform_device *pdev)
 	u32 timer_width = 16;
 	struct device_node *timer = pdev->dev.of_node;
 
+	ttc_config = devm_kzalloc(&pdev->dev, sizeof(*ttc_config), GFP_KERNEL);
+	if (!ttc_config)
+		return -ENOMEM;
+
+	/*
+	 * If pwm-cells property is present in TTC node,
+	 * it would be treated as PWM device.
+	 */
+	if (of_property_read_bool(timer, "#pwm-cells")) {
+		#if defined(CONFIG_PWM_CADENCE)
+		ttc_config->is_pwm_mode = true;
+			return ttc_pwm_probe(pdev);
+		#else
+			return -ENODEV;
+		#endif
+	}
+	dev_set_drvdata(&pdev->dev, ttc_config);
+
 	if (initialized)
 		return 0;
 
@@ -521,6 +544,16 @@ static int __init ttc_timer_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static void ttc_timer_remove(struct platform_device *pdev)
+{
+	#if defined(CONFIG_PWM_CADENCE)
+	struct ttc_timer_config *ttc_config = dev_get_drvdata(&pdev->dev);
+
+	if (ttc_config->is_pwm_mode)
+		ttc_pwm_remove(pdev);
+	#endif
+}
+
 static const struct of_device_id ttc_timer_of_match[] = {
 	{.compatible = "cdns,ttc"},
 	{},
@@ -529,6 +562,7 @@ static const struct of_device_id ttc_timer_of_match[] = {
 MODULE_DEVICE_TABLE(of, ttc_timer_of_match);
 
 static struct platform_driver ttc_timer_driver = {
+	.remove = ttc_timer_remove,
 	.driver = {
 		.name	= "cdns_ttc_timer",
 		.of_match_table = ttc_timer_of_match,
-- 
2.25.1