Re: [PATCH v2 3/4] iio: potentiometer: mcp4531: Add device tree binding

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On 27/06/16 06:30, Florian Vaussard wrote:
> Hi Peter,
> 
> Le 27. 06. 16 à 00:12, Peter Rosin a écrit :
>> Hi Florian,
>>
>> On 2016-06-26 22:22, Florian Vaussard wrote:
>>> This patch adds the necessary device tree binding to allow DT probing of
>>> currently supported parts.
>>>
>>> Signed-off-by: Florian Vaussard <florian.vaussard-EWQkb/GNqlFyDzI6CaY1VQ@public.gmane.org>
>>> ---
>>>  drivers/iio/potentiometer/mcp4531.c | 273 +++++++++++++++++++++++++++++++++++-
>>>  1 file changed, 272 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c
>>> index 2251173..bf7b853 100644
>>> --- a/drivers/iio/potentiometer/mcp4531.c
>>> +++ b/drivers/iio/potentiometer/mcp4531.c
>>> @@ -31,6 +31,8 @@
>>>  #include <linux/module.h>
>>>  #include <linux/i2c.h>
>>>  #include <linux/err.h>
>>> +#include <linux/of.h>
>>> +#include <linux/of_device.h>
>>>  
>>>  #include <linux/iio/iio.h>
>>>  
>>> @@ -188,12 +190,275 @@ static const struct iio_info mcp4531_info = {
>>>  	.driver_module = THIS_MODULE,
>>>  };
>>>  
>>> +#ifdef CONFIG_OF
>>> +static const struct of_device_id mcp4531_of_match[] = {
>>> +	{
>>> +		.compatible = "microchip,mcp4531-502",
>>> +		.data = &mcp4531_cfg[MCP453x_502]
>>> +	},
>>
>> All this vertical whitespace makes this unreadable. I'd be
>> happier with either ignoring the 80 char rule, or skipping
>> the leading tab. I.e.
>>
>> 	{ .compatible = "microchip,mcp4531-502", .data = &mcp4531_cfg[MCP453x_502] },
>> 	{ .compatible = "microchip,mcp4531-103", .data = &mcp4531_cfg[MCP453x_103] },
>> 	{ .compatible = "microchip,mcp4531-503", .data = &mcp4531_cfg[MCP453x_503] },
>> 	...
>>
>> or
>>
>> { .compatible = "microchip,mcp4531-502", .data = &mcp4531_cfg[MCP453x_502] },
>> { .compatible = "microchip,mcp4531-103", .data = &mcp4531_cfg[MCP453x_103] },
>> { .compatible = "microchip,mcp4531-503", .data = &mcp4531_cfg[MCP453x_503] },
>> ...
>>
>> Or perhaps using a macro?
>>
>> #define MCP4531_COMPATIBLE(of_compatible, cfg) {	\
>> 		.compatible = of_compatible,		\
>> 		.data = &mcp4531_cfg[cfg],		\
>> }
>>
>> and then
>>
>> 	MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502),
>> 	MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103),
>> 	MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503),
>> 	...
>>
>> Pick any of those, and you have my ack. Maybe Jonathan has an opinion
>> on which is best?
>>
> 
> The macro is my preferred one, as it makes things easier to read. Jonathan?
I'm fine with any of the options (or indeed the original line break heavy
approach). Take your pick!

Jonathan
> 
> Thanks for the suggestion!
> 
> Best,
> Florian
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