linux-kernel - Re: [PATCH 1/2] extcon: ptn5150: Use defines for registers

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Message-ID: <6e621023-530a-727c-fff7-e8435ca4a4d2@samsung.com>
Date:   Fri, 11 Sep 2020 17:03:02 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Vijai Kumar K <vijaikumar.kanagarajan@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] extcon: ptn5150: Use defines for registers

On 9/11/20 2:38 PM, Krzysztof Kozlowski wrote:
> On Fri, Sep 11, 2020 at 12:14:19PM +0900, Chanwoo Choi wrote:
>> On 9/10/20 12:01 AM, Krzysztof Kozlowski wrote:
>>> The register addresses are not continuous, so use simple defines for
>>> them.  This also makes it easier to find the address for register.
>>>
>>> No functional change.
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
>>> ---
>>>  drivers/extcon/extcon-ptn5150.c | 22 ++++++++++------------
>>>  1 file changed, 10 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
>>> index dda5b3a3a908..1b68f56d8372 100644
>>> --- a/drivers/extcon/extcon-ptn5150.c
>>> +++ b/drivers/extcon/extcon-ptn5150.c
>>> @@ -19,18 +19,16 @@
>>>  #include <linux/gpio/consumer.h>
>>>  
>>>  /* PTN5150 registers */
>>> -enum ptn5150_reg {
>>> -	PTN5150_REG_DEVICE_ID = 0x01,
>>> -	PTN5150_REG_CONTROL,
>>> -	PTN5150_REG_INT_STATUS,
>>> -	PTN5150_REG_CC_STATUS,
>>> -	PTN5150_REG_CON_DET = 0x09,
>>> -	PTN5150_REG_VCONN_STATUS,
>>> -	PTN5150_REG_RESET,
>>> -	PTN5150_REG_INT_MASK = 0x18,
>>> -	PTN5150_REG_INT_REG_STATUS,
>>> -	PTN5150_REG_END,
>>> -};
>>> +#define PTN5150_REG_DEVICE_ID			0x01
>>> +#define PTN5150_REG_CONTROL			0x02
>>> +#define PTN5150_REG_INT_STATUS			0x03
>>> +#define PTN5150_REG_CC_STATUS			0x04
>>> +#define PTN5150_REG_CON_DET			0x09
>>> +#define PTN5150_REG_VCONN_STATUS		0x0a
>>> +#define PTN5150_REG_RESET			0x0b
>>> +#define PTN5150_REG_INT_MASK			0x18
>>> +#define PTN5150_REG_INT_REG_STATUS		0x19
>>> +#define PTN5150_REG_END				PTN5150_REG_INT_REG_STATUS
>>
>> PTN5150_REG_END should be (PTN5150_REG_INT_REG_STATUS + 1)
>> for regmap operation of PTN5150_REG_INT_REG_STATUS.
> 
> Why? This goes to regmap's max_register which is the last register
> allowed to read:
> 
>   drivers/base/regmap/regmap-debugfs.c:   for (i = 0; i <= map->max_register; i += map->reg_stride) {
>   drivers/base/regmap/regmap.c:   if (map->max_register && reg > map->max_register)

It is my mismake. You're right.
Applied them. Thanks.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics