linux-kernel - Re: [PATCH v1] mfd: core: Preserve PLATFORM_DEVID

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Date:   Fri, 24 Mar 2017 11:35:00 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] mfd: core: Preserve PLATFORM_DEVID_NONE

On Thu, 23 Mar 2017, Andy Shevchenko wrote:

> On Thu, 2017-03-23 at 11:21 +0000, Lee Jones wrote:
> > On Thu, 16 Mar 2017, Andy Shevchenko wrote:
> > 
> > > There is a potential flaw if cell has id > 0 and is going to be
> > > registered with PLATFORM_DEVID_NONE.
> > > 
> > > Ignore if PLATFORM_DEVID_NONE is supplied.
> > 
> > This is a substantial change to a pretty tried and tested piece of
> > sub-system code.  Can you put some more meat on the bones in the
> > commit log, and include examples.
> 
> Example in pseudo code:
> 
> cells = {
>  [0] = { .id = 0, .name = "moduleX", },
>  [1] = { .id = 1, .name = "moduleY", },
>  [2] = { .id = 2, .name = "moduleZ", },
>  ...
> };
> 
> mfd_add_devices(..., PLATFORM_DEVID_NONE, cells, ARRAY_SIZE(cells),
> ...);
> 
> Output (names of the devices in the drivers):
> "moduleX"
> "moduleY.0"
> "moduleX.1"
> 
> Desired output:
> "moduleX"
> "moduleY"
> "moduleZ"

Then what would be your reason for populating the 'id' attribute?

> Is it by design?
> 
> > 
> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > ---
> > >  drivers/mfd/mfd-core.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> > > index c57e407020f1..c9583f895058 100644
> > > --- a/drivers/mfd/mfd-core.c
> > > +++ b/drivers/mfd/mfd-core.c
> > > @@ -149,7 +149,7 @@ static int mfd_add_device(struct device *parent,
> > > int id,
> > >  	int platform_id;
> > >  	int r;
> > >  
> > > -	if (id == PLATFORM_DEVID_AUTO)
> > > +	if (id < 0)
> > >  		platform_id = id;
> > >  	else
> > >  		platform_id = id + cell->id;
> > 
> > 
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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