lkml.org 
[lkml]   [2016]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] extcon: Add support for qcom SPMI PMIC USB id detection hardware
On 2016년 06월 29일 06:59, Stephen Boyd wrote:
> Quoting Chanwoo Choi (2016-06-28 05:06:48)
>> 2016-06-28 4:11 GMT+09:00 Stephen Boyd <stephen.boyd@linaro.org>:
>>> Quoting Chanwoo Choi (2016-06-26 04:20:43)
>>>> 2016-06-26 14:56 GMT+09:00 Stephen Boyd <stephen.boyd@linaro.org>:
>>>>> +PROPERTIES
>>>>> +
>>>>> +- compatible:
>>>>> + Usage: required
>>>>> + Value type: <string>
>>>>> + Definition: Should contain "qcom,pm8941-misc";
>>>>> +
>>>>> +- reg:
>>>>> + Usage: required
>>>>> + Value type: <u32>
>>>>> + Definition: Should contain the offset to the misc address space
>>>>
>>>> 'reg' property is used on extcon-qcom-spmi-misc.c?
>>>> I think that you don't need to include this property.
>>>
>>> No it isn't used in the driver right now, but there is a register offset
>>> for this module and there are registers that can be read/written in this
>>> module. I'd like to keep it as required so we can easily read the
>>> registers in the future if needed.
>>
>> OK.
>> But, If you want to remain the reg property, you should add the code to get
>> the register offset by using OF functions. This patch don't include the OF
>> function to handle it.
>>
>
> Sorry I don't follow the argument. I've put the reg property here for
> future proofing so that the binding doesn't have to change in backwards
> incompatible ways in the future if we do need to get the property later.

I don't mention that 'reg' property should be removed.
Just if you want to remain it, you should add some codes as following:
For exmaple,
- of_get_address() to get the address information from device-tree.

If documentation include the some properties, you should add the handling code
in device driver. When you add the code to get the offset from device-tree,
it doesn't influence the some behavior in the future.

Thanks,
Chanwoo Choi








\
 
 \ /
  Last update: 2016-06-29 09:01    [W:0.229 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site