Re: [RESEND PATCH 3/8] mfd: cros_ec: Instantiate sub-devices from device tree

[Lee Jones]

On Tue, 05 May 2015, Javier Martinez Canillas wrote:

> Hello Lee,
> 
> On 04/29/2015 12:39 PM, Lee Jones wrote:
> > On Mon, 06 Apr 2015, Javier Martinez Canillas wrote:
> > 
> >> From: Todd Broch <tbroch@xxxxxxxxxxxx>
> >> 
> >> If the EC device tree node has sub-nodes, try to instantiate them as
> >> MFD sub-devices.  We can configure the EC features provided by the board.
> >> 
> >> Signed-off-by: Todd Broch <tbroch@xxxxxxxxxxxx>
> >> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> >> ---
> >>  drivers/mfd/cros_ec.c | 22 +++++++++++-----------
> >>  1 file changed, 11 insertions(+), 11 deletions(-)
> >> 
> >> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> >> index c4aecc6f8373..8aa83b91e25c 100644
> >> --- a/drivers/mfd/cros_ec.c
> >> +++ b/drivers/mfd/cros_ec.c
> >> @@ -17,6 +17,7 @@
> >>   * battery charging and regulator control, firmware update.
> >>   */
> >>  
> >> +#include <linux/of_platform.h>
> >>  #include <linux/interrupt.h>
> >>  #include <linux/slab.h>
> >>  #include <linux/module.h>
> >> @@ -109,18 +110,8 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
> >>  
> >>  static const struct mfd_cell cros_devs[] = {
> >>  	{
> >> -		.name = "cros-ec-keyb",
> >> -		.id = 1,
> >> -		.of_compatible = "google,cros-ec-keyb",
> >> -	},
> >> -	{
> >> -		.name = "cros-ec-i2c-tunnel",
> >> -		.id = 2,
> >> -		.of_compatible = "google,cros-ec-i2c-tunnel",
> >> -	},
> >> -	{
> >>  		.name = "cros-ec-ctl",
> >> -		.id = 3,
> >> +		.id = 1,
> > 
> > Can't you use PLATFORM_DEVID_AUTO?
> >
> 
> Yes, I think that will work as well so I'll change it.
>  
> >>  	},
> >>  };
> >>  
> >> @@ -150,6 +141,15 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
> >>  		return err;
> >>  	}
> >>  
> >> +#ifdef CONFIG_OF
> >> +	err = of_platform_populate(dev->of_node, NULL, NULL, dev);
> >> +	if (err) {
> >> +		mfd_remove_devices(dev);
> >> +		dev_err(dev, "Failed to register sub-devices\n");
> >> +		return err;
> >> +	}
> >> +#endif
> > 
> > And if we don't support OF?
> >
> 
> These sub-devices are only present on machines that support OF so
> is more flexible to use of_platform_populate() to register those.
> 
> Both machines using and not using DT, register a cros-ec-ctl which
> is still a mfd_cell in the cros_devs array.

I'm not really a fan of #ifdiffery if it can be avoided.

How about?

if (np)
   cros_ec_of_register();

> >>  	dev_info(dev, "Chrome EC device registered\n");
> >>  
> >>  	return 0;
> > 
> 
> Best regards,
> Javier

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