linux-kernel - Re: [PATCH-v3 2/3] mfd: 88pm800: Allow configuration of interrupt clear method

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Date:	Thu, 25 Jun 2015 15:05:34 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, Zhao Ye <zhaoy@...vell.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org, lee.jones@...aro.org
Subject: Re: [PATCH-v3 2/3] mfd: 88pm800: Allow configuration of interrupt
 clear method

On 25.06.2015 14:57, Vaibhav Hiremath wrote:
> 
> 
> On Thursday 25 June 2015 11:20 AM, Krzysztof Kozlowski wrote:
>> On 25.06.2015 14:44, Vaibhav Hiremath wrote:
>>>
>>>
>>> On Thursday 25 June 2015 11:02 AM, Krzysztof Kozlowski wrote:
>>>> On 25.06.2015 14:26, Vaibhav Hiremath wrote:
>>>>>
>>>>>
>>>>> On Thursday 25 June 2015 05:33 AM, Krzysztof Kozlowski wrote:
>>>>>> 2015-06-24 18:21 GMT+09:00 Vaibhav Hiremath
>>>>>> <vaibhav.hiremath@...aro.org>:
>>>>>>> As per the spec, bit 1 (INT_CLEAR_MODE) of reg addr 0xe
>>>>>>> (page 0) controls the method of clearing interrupt
>>>>>>> status of 88pm800 family of devices;
>>>>>>>
>>>>>>>      0: clear on read
>>>>>>>      1: clear on write
>>>>>>>
>>>>>>> This patch allows to configure this field, through DT.
>>>>>>>
>>>>>>> Also, as suggested by "Lee Jones" renaming DT property and variable
>>>>>>> field to appropriate name.
>>>>>>>
>>>>>>> Signed-off-by: Zhao Ye <zhaoy@...vell.com>
>>>>>>> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
>>>>>>
>>>>
> 
> <snip>
> 
>>>
>>> Yes,
>>> Fair enough...
>>>
>>> I see very little value in runtime configuration, why not just do it
>>> only way (either read or write)?
>>> I would prefer to just set it by default (during init), to clear irq on
>>> write.
>>
>> Hard-coding a default value, if board files are not present, looks OK
>> to me.
>>
> 
> This is how it will look, I will also update the binding information
> with this.
> 
> 
> hvaibhav@...ibhav-ThinkPad-T440p:~/projects/mainline/linux$ git diff
> --cached
> diff --git a/drivers/mfd/88pm800.c b/drivers/mfd/88pm800.c
> index 0a417ac..e415a06 100644
> --- a/drivers/mfd/88pm800.c
> +++ b/drivers/mfd/88pm800.c
> @@ -645,9 +645,8 @@ static int pm800_probe(struct i2c_client *client,
>                         dev_err(&client->dev, "failed to allocaate
> memory\n");
>                         return -ENOMEM;
>                 }
> -
> -               pdata->irq_clr_on_wr = of_property_read_bool(np,
> -                                       "marvell,irq-clr-on-write");
> +               /* Setting irq clear method on write */
> +               pdata->irq_clr_on_wr = true;
>         }
> 
>         ret = pm80x_init(client);

IMHO it is good.

Best regards,
Krzysztof

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