linux-kernel - Re: [PATCH V4 3/3] pwm: pxa: add device tree support

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Date:	Tue, 21 May 2013 13:21:29 +0800
From:	Chao Xie <xiechao.mail@...il.com>
To:	Eric Miao <eric.y.miao@...il.com>
Cc:	Chao Xie <chao.xie@...vell.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4 3/3] pwm: pxa: add device tree support

hi, Thierry
Eric has acked all the patches. So can you help to merge them?
Thanks.


On Mon, May 13, 2013 at 2:20 PM, Eric Miao <eric.y.miao@...il.com> wrote:
> On Mon, May 13, 2013 at 1:04 PM, Chao Xie <xiechao.mail@...il.com> wrote:
>>>> +       const struct of_device_id *of_id =
>>>> +                       of_match_device(pxa_pwm_of_match, &pdev->dev);
>>>> +       unsigned int npwm;
>>>> +
>>>> +       if (!of_id)
>>>> +               return -ENODEV;
>>>> +
>>>> +       npwm = (unsigned int)of_id->data;
>>>> +       pwm->chip.npwm = (npwm & HAS_SECONDARY_PWM) ? 2 : 1;
>>>> +
>>>> +       return 0;
>>>> +}
>>>> +
>>>>  static int pwm_probe(struct platform_device *pdev)
>>>>  {
>>>>         const struct platform_device_id *id = platform_get_device_id(pdev);
>>>> @@ -144,7 +180,6 @@ static int pwm_probe(struct platform_device *pdev)
>>>>         pwm->chip.dev = &pdev->dev;
>>>>         pwm->chip.ops = &pxa_pwm_ops;
>>>>         pwm->chip.base = -1;
>>>> -       pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
>>>>
>>>>         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>>         if (r == NULL) {
>>>> @@ -156,6 +191,20 @@ static int pwm_probe(struct platform_device *pdev)
>>>>         if (IS_ERR(pwm->mmio_base))
>>>>                 return PTR_ERR(pwm->mmio_base);
>>>>
>>>> +       if (!id) {
>>>> +               if (IS_ENABLED(CONFIG_OF))
>>>> +                       ret = pxa_pwm_parse_data_dt(pdev, pwm);
>>>> +               else
>>>> +                       ret = -ENODEV;
>>>> +       } else {
>>>> +               pwm->chip.npwm = (id->driver_data & HAS_SECONDARY_PWM) ? 2 : 1;
>>>> +       }
>>>
>>> ^^ braces not necessarily here, and I'm not really sure if we should check
>>> CONFIG_OF firstly, and leave the platform_device_id thing as a legacy
>>> fall back, what do you think?
>>>
>>>   if (IS_ENABLED(CONFIG_OF)) {
>>>      ...
>>>   } else {
>>>     const struct platform_device_id *id = platform_get_device_id(...);
>>>     ...
>>>   }
>>>
>> it has some reasons.
>> You ways works for
>>      1. PWM defined in DT configuration file and CONFIG_OF is defined
>>      2. CONFIG_OF is not defined.
>> If COFNIG_OF is defined, but PWM is not defined in device tree
>> configuration file. The device
>> can still match the driver is the id_table is matched or name is matched.
>> So I covered addtional situation
>>     1. PWM is not defined in DT configuration file but CONFIG_OF is defined.
>>
>> So i keep the possiblility that event CONFIG_OF is defined, but PWM is
>> not defined in DT file, and we still can use old way to probe the
>> device.
>>
>
> Yeah I was thinking maybe we should not keep the legacy working if
> CONFIG_OF is defined, but that should be OK:
>
> Acked-by: Eric Miao <eric.y.miao@...il.com>
>
>>>> +
>>>> +       if (ret) {
>>>> +               dev_err(&pdev->dev, "failed to parse data from device id\n");
>>>> +               return ret;
>>>> +       }
>>>> +
>>>>         ret = pwmchip_add(&pwm->chip);
>>>>         if (ret < 0) {
>>>>                 dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
>>>> @@ -181,6 +230,7 @@ static struct platform_driver pwm_driver = {
>>>>         .driver         = {
>>>>                 .name   = "pxa25x-pwm",
>>>>                 .owner  = THIS_MODULE,
>>>> +               .of_match_table = pxa_pwm_of_match,
>>>>         },
>>>>         .probe          = pwm_probe,
>>>>         .remove         = pwm_remove,
>>>> --
>>>> 1.7.4.1
>>>>
--
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