linux-kernel - Re: [PATCH 07/10] hwmon: (amc2821) Use BIT() and GENMASK()

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Date: Mon, 1 Jul 2024 13:31:46 +0200
From: Quentin Schulz <quentin.schulz@...rry.de>
To: Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Farouk Bouabid <farouk.bouabid@...rry.de>
Subject: Re: [PATCH 07/10] hwmon: (amc2821) Use BIT() and GENMASK()

Hi Guenter,

On 6/28/24 5:13 PM, Guenter Roeck wrote:
> Use BIT() and GENMASK() for bit and mask definitions
> to help distinguish bit and mask definitions from other
> defines and to make the code easier to read.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>   drivers/hwmon/amc6821.c | 71 +++++++++++++++++++++--------------------
>   1 file changed, 36 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
> index 03ce2e3ffd86..042e2044de7b 100644
> --- a/drivers/hwmon/amc6821.c
> +++ b/drivers/hwmon/amc6821.c
> @@ -8,6 +8,7 @@
>    * Copyright (C) 2007 Hans J. Koch <hjk@...sjkoch.de>
>    */
>   
> +#include <linux/bits.h>
>   #include <linux/err.h>
>   #include <linux/hwmon.h>
>   #include <linux/hwmon-sysfs.h>
> @@ -68,46 +69,46 @@ enum chips { amc6821 };
>   #define AMC6821_REG_TACH_SETTINGL	0x1e
>   #define AMC6821_REG_TACH_SETTINGH	0x1f
>   
> -#define AMC6821_CONF1_START		0x01
> -#define AMC6821_CONF1_FAN_INT_EN	0x02
> -#define AMC6821_CONF1_FANIE		0x04
> -#define AMC6821_CONF1_PWMINV		0x08
> -#define AMC6821_CONF1_FAN_FAULT_EN	0x10
> -#define AMC6821_CONF1_FDRC0		0x20
> -#define AMC6821_CONF1_FDRC1		0x40
> -#define AMC6821_CONF1_THERMOVIE		0x80
> +#define AMC6821_CONF1_START		BIT(0)
> +#define AMC6821_CONF1_FAN_INT_EN	BIT(1)
> +#define AMC6821_CONF1_FANIE		BIT(2)
> +#define AMC6821_CONF1_PWMINV		BIT(3)
> +#define AMC6821_CONF1_FAN_FAULT_EN	BIT(4)
> +#define AMC6821_CONF1_FDRC0		BIT(5)
> +#define AMC6821_CONF1_FDRC1		BIT(7)

Should be BIT(6) here if I'm not mistaken.

The rest looks fine to me. We could also start to use FIELD_GET, 
FIELD_PREP, ... instead of manually shifting and masking in-code.

Cheers,
Quentin