linux-kernel - Re: [PATCH 1/2] mfd: twl4030-madc: Add devicetree support.

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Date:	Fri, 14 Feb 2014 15:53:18 +0100
From:	Belisko Marek <marek.belisko@...il.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"Dr. H. Nikolaus Schaller" <hns@...delico.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] mfd: twl4030-madc: Add devicetree support.

On Fri, Feb 14, 2014 at 2:48 PM, Lee Jones <lee.jones@...aro.org> wrote:
>> Signed-off-by: Marek Belisko <marek@...delico.com>
>> ---
>>  .../devicetree/bindings/mfd/twl4030-madc.txt       | 18 +++++++++++++
>>  drivers/mfd/twl4030-madc.c                         | 31
>> ++++++++++++++++++++--
>
> Please separate these into different patches.
OK.
>
>>  2 files changed, 47 insertions(+), 2 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/mfd/twl4030-madc.txt
>
> <snip>
>
>> +++ b/drivers/mfd/twl4030-madc.c
>> @@ -695,6 +695,29 @@ static int twl4030_madc_set_power(struct twl4030_madc_data *madc, int on)
>>       return 0;
>>  }
>>
>> +#ifdef CONFIG_OF
>
> I believe we're heading for a more:
>
>   if (IS_ENABLED(CONFIG_OF))
>
> ... approach. I won't enforce it, but please consider using it.
OK I'll use it in next version.
>
>> +static struct twl4030_madc_platform_data *
>> +     twl4030_madc_of_parse(struct platform_device *pdev)
>> +{
>> +     struct twl4030_madc_platform_data *pdata;
>> +
>> +     pdata = devm_kzalloc(&pdev->dev,
>> +                     sizeof(struct twl4030_madc_platform_data), GFP_KERNEL);
>
> s/struct twl4030_madc_platform_data/*pdata/
Right typo.
>
>> +     if (!pdata)
>> +             return ERR_PTR(-ENOMEM);
>> +
>> +     pdata->irq_line = platform_get_irq(pdev, 0);
>
> Why weren't 'resources' used in the original implementation?
Not sure I'm not an author :). It's passed in platform data.
>
>> +     return pdata;
>> +}
>> +
>> +static const struct of_device_id twl4030_madc_dt_match_table[] = {
>> +     { .compatible = "ti,twl4030-madc" },
>> +     {},
>> +};
>> +
>> +#endif
>> +
>>  /*
>>   * Initialize MADC and request for threaded irq
>>   */
>> @@ -706,8 +729,11 @@ static int twl4030_madc_probe(struct platform_device *pdev)
>>       u8 regval;
>>
>>       if (!pdata) {
>> -             dev_err(&pdev->dev, "platform_data not available\n");
>> -             return -EINVAL;
>> +             pdata = twl4030_madc_of_parse(pdev);
>> +             if (!pdata) {
>
> And if you received -ENOMEM?
Hmm right. I'll fix that.
>
>> +                     dev_err(&pdev->dev, "platform_data not available\n");
>> +                     return -EINVAL;
>> +             }
>>       }
>>       madc = kzalloc(sizeof(*madc), GFP_KERNEL);
>>       if (!madc)
>> @@ -807,6 +833,7 @@ static struct platform_driver twl4030_madc_driver = {
>>       .driver = {
>>                  .name = "twl4030_madc",
>>                  .owner = THIS_MODULE,
>> +                .of_match_table = of_match_ptr(twl4030_madc_dt_match_table),
>>                  },
>>  };
>>
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog

BR,

marek

-- 
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