linux-kernel - RE: [PATCH] hwmon : (mr75203) fix macro typo

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Message-ID: <c1d036c0cfa14fbb9c289f792780f003@yadro.com>
Date:   Wed, 15 Dec 2021 12:36:32 +0000
From:   Arseny Demidov <a.demidov@...ro.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Arseny Demidov <arsdemal@...il.com>
CC:     Jean Delvare <jdelvare@...e.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] hwmon : (mr75203) fix macro typo

Yes, I have access to the datasheet and caught an error on simulation IP-block.
The datasheet says that register "Expressed in units of IP clk cycles."
Typical power-up delays for Temperature Sensor are 256 cycles i. e. 0x100

-----Original Message-----
From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter Roeck
Sent: Wednesday, December 15, 2021 3:31 PM
To: Arseny Demidov <arsdemal@...il.com>
Cc: Arseny Demidov <a.demidov@...ro.com>; Jean Delvare <jdelvare@...e.com>; linux-hwmon@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon : (mr75203) fix macro typo

On 12/15/21 3:59 AM, Guenter Roeck wrote:
> On 12/15/21 3:30 AM, Arseny Demidov wrote:
>> In the file mr75203.c we have a macro named POWER_DELAY_CYCLE_256, 
>> the correct value should be 0x100
>>
> 
> How do you know that ? Do you have access to the datasheet, or is it 
> just an assumption based on the name of the define ?
> 

Also, how do you know that the value is wrong, not the name of the define ?

Guenter

> Guenter
> 
>> Signed-off-by: Arseny Demidov <a.demidov@...ro.com>
>> ---
>>   drivers/hwmon/mr75203.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c index 
>> 868243dba1ee..1ba1e3145969 100644
>> --- a/drivers/hwmon/mr75203.c
>> +++ b/drivers/hwmon/mr75203.c
>> @@ -93,7 +93,7 @@
>>   #define VM_CH_REQ    BIT(21)
>>   #define IP_TMR            0x05
>> -#define POWER_DELAY_CYCLE_256    0x80
>> +#define POWER_DELAY_CYCLE_256    0x100
>>   #define POWER_DELAY_CYCLE_64    0x40
>>   #define PVT_POLL_DELAY_US    20
>>
>