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

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Message-ID: <CAP6Zq1hEFN==n3Um6MCvR-MqPERxwrm8Qd0DrKudA6L4xynDZA@mail.gmail.com>
Date:   Tue, 31 Oct 2023 09:54:03 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     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,
        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

Hi Guenter,

Thanks for your comments

On Mon, 30 Oct 2023 at 17:57, Guenter Roeck <linux@...ck-us.net> wrote:
>
> 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().
I will change the handle in npcm7xx_pwm_is_visible
>
> Guenter
>

Thanks,

Tomer