linux-kernel - Re: [PATCH v2 3/3] hwmon: (lm85) add support for LM96000 high frequencies

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Message-ID: <20190201223746.GA16166@roeck-us.net>
Date:   Fri, 1 Feb 2019 14:37:46 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jeremy Gebben <jgebben@...ptlaser.com>
Cc:     Jean Delvare <jdelvare@...e.com>, Jonathan Corbet <corbet@....net>,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] hwmon: (lm85) add support for LM96000 high
 frequencies

On Thu, Jan 31, 2019 at 03:06:17PM -0700, Jeremy Gebben wrote:
> This chip expands the freqency field from 3 to 4 bits, to
> add more frequencies in the 22.5 to 30 kHz ranges.
> 
"This chip" -> LM96000

> Signed-off-by: Jeremy Gebben <jgebben@...ptlaser.com>
> ---
>  Documentation/hwmon/lm85 | 3 +++
>  drivers/hwmon/lm85.c     | 9 +++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/Documentation/hwmon/lm85 b/Documentation/hwmon/lm85
> index 9f3a945d1..264874f09 100644
> --- a/Documentation/hwmon/lm85
> +++ b/Documentation/hwmon/lm85
> @@ -140,6 +140,9 @@ of voltage and temperature channels.
>  SMSC EMC6D103S is similar to EMC6D103, but does not support pwm#_auto_pwm_minctl
>  and temp#_auto_temp_off.
>  
> +The LM96000 supports additional high frequency PWM modes (22.5 kHz, 24 kHz,
> +25.7 kHz, 27.7 kHz and 30 kHz), which can be configured on a per-PWM basis.
> +
>  Hardware Configurations
>  -----------------------
>  
> diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
> index 4b15193d1..88f08f4bc 100644
> --- a/drivers/hwmon/lm85.c
> +++ b/drivers/hwmon/lm85.c
> @@ -202,6 +202,11 @@ static const int lm85_freq_map[] = { /* 1 Hz */
>  	10, 15, 23, 30, 38, 47, 61, 94
>  };
>  
> +static const int lm85_high_freq_map[] = { /* 1 Hz */
> +	10, 15, 23, 30, 38, 47, 61, 94,
> +	22500, 24000, 25700, 25700, 27700, 27700, 30000, 30000
> +};

Should be lm96000_freq_map.

> +
>  static const int adm1027_freq_map[] = { /* 1 Hz */
>  	11, 15, 22, 29, 35, 44, 59, 88
>  };
> @@ -1574,6 +1579,10 @@ static int lm85_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  		data->freq_map = adm1027_freq_map;
>  		data->freq_map_size = ARRAY_SIZE(adm1027_freq_map);
>  		break;
> +	case lm85:
> +		data->freq_map = lm85_high_freq_map;
> +		data->freq_map_size = ARRAY_SIZE(lm85_high_freq_map);
> +		break;

This is too generic. You'll have to introduce a 'lm96000' type
and use it. That should be straightforward since the lm96000 
is already detected (and for some reason handled as lm85).

>  	default:
>  		data->freq_map = lm85_freq_map;
>  		data->freq_map_size = ARRAY_SIZE(lm85_freq_map);
> -- 
> 2.17.1
>