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

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Date:   Mon, 30 Oct 2023 08:57:04 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tomer Maimon <tmaimon77@...il.com>, 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
Subject: Re: [PATCH v3 1/1] hwmon: npcm750-pwm-fan: Add NPCM8xx support

On 10/30/23 08:01, Tomer Maimon wrote:
> 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);

I would have expected this check to be handled in npcm7xx_pwm_is_visible().

Guenter