linux-kernel - [PATCH v3 1/1] hwmon: npcm750-pwm-fan: Add NPCM8xx support

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Message-ID: <20231030150119.342791-2-tmaimon77@gmail.com>
Date:   Mon, 30 Oct 2023 17:01:19 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     <linux@...ck-us.net>, <jdelvare@...e.com>,
        <avifishman70@...il.com>, <tali.perry1@...il.com>,
        <joel@....id.au>, <andrew@...econstruct.com.au>,
        <venture@...gle.com>, <yuenn@...gle.com>,
        <benjaminfair@...gle.com>, <j.neuschaefer@....net>
CC:     <openbmc@...ts.ozlabs.org>, <linux-hwmon@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Tomer Maimon <tmaimon77@...il.com>
Subject: [PATCH v3 1/1] hwmon: npcm750-pwm-fan: Add NPCM8xx support

Adding Pulse Width Modulation (PWM) and fan tacho NPCM8xx support to
NPCM PWM and fan tacho driver.
NPCM8xx uses a different number of PWM devices.

As part of adding NPCM8XX support:
- Add NPCM8xx specific compatible string.
- Add data to handle architecture-specific PWM and fan tacho parameters.

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
---
 drivers/hwmon/npcm750-pwm-fan.c | 34 +++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/npcm750-pwm-fan.c b/drivers/hwmon/npcm750-pwm-fan.c
index 10ed3f4335d4..765b08fa0396 100644
--- a/drivers/hwmon/npcm750-pwm-fan.c
+++ b/drivers/hwmon/npcm750-pwm-fan.c
@@ -46,9 +46,9 @@
 #define NPCM7XX_PWM_CTRL_CH3_EN_BIT		BIT(16)
 
 /* Define the maximum PWM channel number */
-#define NPCM7XX_PWM_MAX_CHN_NUM			8
+#define NPCM7XX_PWM_MAX_CHN_NUM			12
 #define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE	4
-#define NPCM7XX_PWM_MAX_MODULES                 2
+#define NPCM7XX_PWM_MAX_MODULES                 3
 
 /* Define the Counter Register, value = 100 for match 100% */
 #define NPCM7XX_PWM_COUNTER_DEFAULT_NUM		255
@@ -171,6 +171,10 @@
 #define FAN_PREPARE_TO_GET_FIRST_CAPTURE	0x01
 #define FAN_ENOUGH_SAMPLE			0x02
 
+struct npcm_hwmon_info {
+	u32 pwm_max_channel;
+};
+
 struct npcm7xx_fan_dev {
 	u8 fan_st_flg;
 	u8 fan_pls_per_rev;
@@ -204,6 +208,7 @@ struct npcm7xx_pwm_fan_data {
 	struct timer_list fan_timer;
 	struct npcm7xx_fan_dev fan_dev[NPCM7XX_FAN_MAX_CHN_NUM];
 	struct npcm7xx_cooling_device *cdev[NPCM7XX_PWM_MAX_CHN_NUM];
+	const struct npcm_hwmon_info *info;
 	u8 fan_select;
 };
 
@@ -619,9 +624,13 @@ static umode_t npcm7xx_is_visible(const void *data,
 				  enum hwmon_sensor_types type,
 				  u32 attr, int channel)
 {
+	const struct npcm7xx_pwm_fan_data *hwmon_data = data;
+
 	switch (type) {
 	case hwmon_pwm:
-		return npcm7xx_pwm_is_visible(data, attr, channel);
+		if (channel < hwmon_data->info->pwm_max_channel)
+			return npcm7xx_pwm_is_visible(data, attr, channel);
+		return 0;
 	case hwmon_fan:
 		return npcm7xx_fan_is_visible(data, attr, channel);
 	default:
@@ -638,6 +647,10 @@ static const struct hwmon_channel_info * const npcm7xx_info[] = {
 			   HWMON_PWM_INPUT,
 			   HWMON_PWM_INPUT,
 			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
+			   HWMON_PWM_INPUT,
 			   HWMON_PWM_INPUT),
 	HWMON_CHANNEL_INFO(fan,
 			   HWMON_F_INPUT,
@@ -670,6 +683,14 @@ static const struct hwmon_chip_info npcm7xx_chip_info = {
 	.info = npcm7xx_info,
 };
 
+static const struct npcm_hwmon_info npxm7xx_hwmon_info = {
+	.pwm_max_channel = 8,
+};
+
+static const struct npcm_hwmon_info npxm8xx_hwmon_info = {
+	.pwm_max_channel = 12,
+};
+
 static u32 npcm7xx_pwm_init(struct npcm7xx_pwm_fan_data *data)
 {
 	int m, ch;
@@ -923,6 +944,10 @@ static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	data->info = device_get_match_data(dev);
+	if (!data->info)
+		return -EINVAL;
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
 	if (!res) {
 		dev_err(dev, "pwm resource not found\n");
@@ -1015,7 +1040,8 @@ static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id of_pwm_fan_match_table[] = {
-	{ .compatible = "nuvoton,npcm750-pwm-fan", },
+	{ .compatible = "nuvoton,npcm750-pwm-fan", .data = &npxm7xx_hwmon_info},
+	{ .compatible = "nuvoton,npcm845-pwm-fan", .data = &npxm8xx_hwmon_info},
 	{},
 };
 MODULE_DEVICE_TABLE(of, of_pwm_fan_match_table);
-- 
2.33.0