Re: [PATCH 2/2] mfd: twl4030: add twl4030-pwrbutton as our child

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 27 Feb 2009 21:28:03 +0200
Felipe Balbi <me@felipebalbi.com> wrote:

> From: Felipe Balbi <felipe.balbi@nokia.com>
> 
> Make that twl4030-pwrbutton.c driver probe with current
> child creation api for twl4030.
> 
> Cc: Samuel Ortiz <sameo@openedhand.com>
> Cc: David Brownell <dbrownell@users.sourceforge.net>
> Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
> ---
> This part is better off going via mfd.
> 
>  drivers/mfd/twl4030-core.c |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
> index 68826f1..c86bc3b 100644
> --- a/drivers/mfd/twl4030-core.c
> +++ b/drivers/mfd/twl4030-core.c
> @@ -101,6 +101,12 @@
>  #define twl_has_usb()	false
>  #endif
>  
> +#if defined(CONFIG_INPUT_TWL4030_PWRBUTTON) \
> +	|| defined(CONFIG_INPUT_TWL4030_PWBUTTON_MODULE)

OK, this is "wrong".  The core shouldn't need to know about specific
clients.

> +#define twl_has_pwrbutton()	true
> +#else
> +#define twl_has_pwrbutton()	false
> +#endif
>  
>  /* Triton Core internal information (BEGIN) */
>  
> @@ -526,6 +532,13 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
>  		usb_transceiver = child;
>  	}
>  
> +	if (twl_has_pwrbutton()) {
> +		child = add_child(1, "twl4030_pwrbutton",
> +				NULL, 0, true, pdata->irq_base + 8 + 0, 0);
> +		if (IS_ERR(child))
> +			return PTR_ERR(child);
> +	}
> +
>  	if (twl_has_regulator()) {
>  		/*
>  		child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);

The client module should register itself with the core, rather than the core
registering the client.

What has gone wrong here?