linux-kernel - Re: [PATCH 1/3] hwmon: (nct6775) Fix incomplete register array

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Date:   Thu, 16 Nov 2023 01:03:51 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Xing Tong Wu <xingtong_wu@....com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, xingtong.wu@...mens.com,
        tobias.schaffner@...mens.com, gerd.haeussler.ext@...mens.com
Subject: Re: [PATCH 1/3] hwmon: (nct6775) Fix incomplete register array

On Thu, Nov 16, 2023 at 10:23:28AM +0800, Xing Tong Wu wrote:
> From: Xing Tong Wu <xingtong.wu@...mens.com>
> 
> The nct6116 specification actually includes 5 PWMs, but only 3
> PWMs are present in the array. To address this, the missing 2
> PWMs have been added to the array.
> 
> Signed-off-by: Xing Tong Wu <xingtong.wu@...mens.com>
> ---
>  drivers/hwmon/nct6775-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
> index d928eb8ae5a3..2111f0cd9787 100644
> --- a/drivers/hwmon/nct6775-core.c
> +++ b/drivers/hwmon/nct6775-core.c
> @@ -769,7 +769,7 @@ static const u16 NCT6106_FAN_PULSE_SHIFT[] = { 0, 2, 4 };
>  
>  static const u8 NCT6106_REG_PWM_MODE[] = { 0xf3, 0xf3, 0xf3 };
>  static const u8 NCT6106_PWM_MODE_MASK[] = { 0x01, 0x02, 0x04 };
> -static const u16 NCT6106_REG_PWM_READ[] = { 0x4a, 0x4b, 0x4c };
> +static const u16 NCT6106_REG_PWM_READ[] = { 0x4a, 0x4b, 0x4c, 0xd8, 0xd9 };

I'll have to check the datasheet if this is generic, but at the very least
it is incomplete and REG_PWM_MODE as well as REG_PWM_MODE_MASK would
have to be updated as well. Also, I don't see an update to has_pwm,
meaning the two additional pwm controls won't ever be used/enabled.

Guenter