The name of the patch is misleading since you also add support for
pwm1_min/max.

Could you add change the title to "nouveau/hwmon: expose the auto_point
and pwm_min/max attrs"? And while you are at it, please change every
commit title to nouveau/hwmon instead of nouveau_hwmon.

On 26/04/17 19:46, Oscar Salvador wrote:
> This patch creates a special group attributes for attrs like "*auto_point*".
> We check if we have support for them, and if we do, we gather them all in
> an attribute_group's structure which is the parameter regarding special groups
> of hwmon_device_register_with_info.
> 
> Signed-off-by: Oscar Salvador <osalvador.vilard...@gmail.com>
> ---
>  drivers/gpu/drm/nouveau/nouveau_hwmon.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c 
> b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> index 4db65fb..9142779 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
> @@ -358,6 +358,23 @@ nouveau_hwmon_get_power1_crit(struct nouveau_drm *drm)
>       return iccsense->power_w_crit;
>  }
>  
> +static struct attribute *pwm_fan_sensor_attrs[] = {
> +     &sensor_dev_attr_pwm1_min.dev_attr.attr,
> +     &sensor_dev_attr_pwm1_max.dev_attr.attr,
> +     NULL
> +};
> +ATTRIBUTE_GROUPS(pwm_fan_sensor);
> +
> +static struct attribute *temp1_auto_point_sensor_attrs[] = {
> +     &sensor_dev_attr_temp1_auto_point1_pwm.dev_attr.attr,
> +     &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
> +     &sensor_dev_attr_temp1_auto_point1_temp_hyst.dev_attr.attr,
> +     NULL
> +};
> +ATTRIBUTE_GROUPS(temp1_auto_point_sensor);
> +
> +#define N_ATTR_GROUPS   3
> +
>  static const u32 nouveau_config_chip[] = {
>       HWMON_C_UPDATE_INTERVAL,
>       0
> @@ -792,17 +809,27 @@ nouveau_hwmon_init(struct drm_device *dev)
>  #if defined(CONFIG_HWMON) || (defined(MODULE) && 
> defined(CONFIG_HWMON_MODULE))
>       struct nouveau_drm *drm = nouveau_drm(dev);
>       struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
> +     const struct attribute_group *special_groups[N_ATTR_GROUPS];
>       struct nouveau_hwmon *hwmon;
>       struct device *hwmon_dev;
>       int ret = 0;
> +     int i = 0;
>  
>       hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
>       if (!hwmon)
>               return -ENOMEM;
>       hwmon->dev = dev;
>  
> +     if (therm && therm->attr_get && therm->attr_set) {
> +             if (nvkm_therm_temp_get(therm) >= 0)
> +                     special_groups[i++] = &temp1_auto_point_sensor_group;
> +             if (therm->fan_get && therm->fan_get(therm) >= 0)
> +                     special_groups[i++] = &pwm_fan_sensor_group;
> +     }
> +
> +     special_groups[i] = 0;
>       hwmon_dev = hwmon_device_register_with_info(dev->dev, "nouveau", dev,
> -                                             &nouveau_chip_info, NULL);
> +                                     &nouveau_chip_info, special_groups);

Please align &nouveau_chip_info with dev->dev and split special_groups
on the following line.

>       if (IS_ERR(hwmon_dev)) {
>               ret = PTR_ERR(hwmon_dev);
>               NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
> 

This commit breaks bisectability, so Ben may have to squash it in the
previous one. Otherwise, this looks good to me:

Reviewed-by: Martin Peres <martin.pe...@free.fr>
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