linux-kernel - Re: [PATCH 2/2] mfd: dln2: add support for USB-SPI module

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Date:	Tue, 11 Nov 2014 15:09:04 +0200
From:	Laurentiu Palcu <laurentiu.palcu@...el.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Johan Havold <johan@...nel.org>,
	Octavian Purdila <octavian.purdila@...el.com>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mfd: dln2: add support for USB-SPI module

Hi Lee,

On Mon, Nov 10, 2014 at 09:30:05AM +0000, Lee Jones wrote:
> On Fri, 07 Nov 2014, Laurentiu Palcu wrote:
> 
> > Signed-off-by: Laurentiu Palcu <laurentiu.palcu@...el.com>
> > ---
> >  drivers/mfd/dln2.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
> > index 9765a17..0cdad2d 100644
> > --- a/drivers/mfd/dln2.c
> > +++ b/drivers/mfd/dln2.c
> > @@ -52,6 +52,7 @@ enum dln2_handle {
> >  	DLN2_HANDLE_CTRL,
> >  	DLN2_HANDLE_GPIO,
> >  	DLN2_HANDLE_I2C,
> > +	DLN2_HANDLE_SPI,
> >  	DLN2_HANDLES
> >  };
> >  
> > @@ -634,6 +635,12 @@ static struct dln2_platform_data dln2_pdata_i2c = {
> >  	.port = 0,
> >  };
> >  
> > +/* Only one SPI port supported */
> > +static struct dln2_platform_data dln2_pdata_spi = {
> 
> Is this ever fiddled with?  If not, const?
Well, if we declare this const we also need to cast the assignment below to
void* since platform_data is void*. Otherwise we get a "assignment
discards ‘const’ qualifier from pointer target type" warning. 

Also, for consistency, we have to do it for all dln2_pdata_*. I'm not
sure it's worth it...

laurentiu

> 
> > +	.handle = DLN2_HANDLE_SPI,
> > +	.port = 0,
> > +};
> > +
> >  static const struct mfd_cell dln2_devs[] = {
> >  	{
> >  		.name = "dln2-gpio",
> > @@ -645,6 +652,11 @@ static const struct mfd_cell dln2_devs[] = {
> >  		.platform_data = &dln2_pdata_i2c,
> >  		.pdata_size = sizeof(struct dln2_platform_data),
> >  	},
> > +	{
> > +		.name = "dln2-spi",
> > +		.platform_data = &dln2_pdata_spi,
> > +		.pdata_size = sizeof(struct dln2_platform_data),
> > +	},
> >  };
> >  
> >  static void dln2_disconnect(struct usb_interface *interface)
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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