linux-kernel - Re: [PATCH] Input: tl6040-vibra: Device Tree support

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Message-ID: <4FA7A8B9.4040208@ti.com>
Date:	Mon, 07 May 2012 13:49:29 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Misael Lopez Cruz <misael.lopez@...com>,
	Benoit Cousson <b-cousson@...com>,
	devicetree-discuss@...ts.ozlabs.org, Liam Girdwood <lrg@...com>
Subject: Re: [PATCH] Input: tl6040-vibra: Device Tree support

Hi Dmitry,

On 05/07/2012 10:02 AM, Dmitry Torokhov wrote:
> Hi Peter,
> 
> On Fri, May 04, 2012 at 03:05:13PM +0300, Peter Ujfalusi wrote:
>> +	if (pdata) {
>> +		info->vibldrv_res = pdata->vibldrv_res;
>> +		info->vibrdrv_res = pdata->vibrdrv_res;
>> +		info->viblmotor_res = pdata->viblmotor_res;
>> +		info->vibrmotor_res = pdata->vibrmotor_res;
>> +		vddvibl_uV = pdata->vddvibl_uV;
>> +		vddvibr_uV = pdata->vddvibr_uV;
>> +	} else {
>> +		of_property_read_u32(node, "vibldrv_res", &info->vibldrv_res);
>> +		of_property_read_u32(node, "vibrdrv_res", &info->vibrdrv_res);
>> +		of_property_read_u32(node, "viblmotor_res",
>> +				     &info->viblmotor_res);
>> +		of_property_read_u32(node, "vibrmotor_res",
>> +				     &info->vibrmotor_res);
> 
> Since these 4 appear to be mandatory properties don't we need to
> validate they are actually present in DT?

If the property does not exist in the DT blob the variable will not be
updated - it will remain 0.
I have kept the validity check for the resistance values. This will
catch the case when something is missing from the DT blob.

I just did not wanted to complicate the code with additional checks
since the end result would be the same.

-- 
Péter
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