linux-kernel - Re: [PATCH v6] input: drv260x: Add TI drv260x haptics driver

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Date:	Tue, 19 Aug 2014 20:13:32 +0000
From:	"Murphy, Dan" <dmurphy@...com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"mark.rutland@....com" <mark.rutland@....com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6] input: drv260x: Add TI drv260x haptics driver

On 08/19/2014 03:07 PM, Dmitry Torokhov wrote:
> On Tue, Aug 19, 2014 at 07:35:06PM +0000, Murphy, Dan wrote:
>> Dmitry
>>
>> On 08/19/2014 02:24 PM, Dmitry Torokhov wrote:
>>> Hi Dan,
>>>
>>> On Fri, Aug 15, 2014 at 10:47:50AM -0500, Dan Murphy wrote:
>>>> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
>>>> index 2ff4425..99f6762 100644
>>>> --- a/drivers/input/misc/Kconfig
>>>> +++ b/drivers/input/misc/Kconfig
>>>> @@ -676,4 +676,13 @@ config INPUT_SOC_BUTTON_ARRAY
>>>>  	  To compile this driver as a module, choose M here: the
>>>>  	  module will be called soc_button_array.
>>>>  
>>>> +config INPUT_DRV260X_HAPTICS
>>>> +	tristate "TI DRV260X haptics support"
>>>> +	depends on INPUT && I2C
>>>
>>> This also needs "select REGMAP_I2C"
>>>
>>
>> This one is OK
>>
>>>> +	help
>>>> +	  Say Y to enable support for the TI DRV260X haptics driver.
>>>> +
>>>> +	  To compile this driver as a module, choose M here: the
>>>> +	  module will be called drv260x-haptics.
>>>> +
>>>
>>> [...]
>>>
>>>> +#ifndef _LINUX_DRV260X_PDATA_H
>>>> +#define _LINUX_DRV260X_PDATA_H
>>>> +
>>>> +struct drv260x_platform_data {
>>>> +	int enable_gpio;
>>>
>>> I do not see this used anywhere.
>>
>> But this is actually used here
>>
>> haptics->enable_gpio = devm_gpiod_get(&client->dev, "enable");
>>
>> for the non-dt case
> 
> "haptics" is not instance of drv260x_platform_data but drv260x_data which
> defines:
> 
> struct drv260x_data {
> 	...
> 	struct gpio_desc *enable_gpio;
> 	...
> 
> That one I kept.
> 

Yes that is correct but the enable_gpio for non-dt enabled devices this enable_gpio
needs to come from the platform data structure.  Without the enable gpio in the platform data
structure there is no way for non-dt enabled devices to set the gpio value.

The haptics instance just stores the gpio descriptor returned from this call.

The devm_gpiod looks at the platform data is CONFIG_OF is not set.

Dan

-- 
------------------
Dan Murphy
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