linux-kernel - Re: [PATCH 1/1] mfd: syscon: return -ENXIO if CONFIG_MFD

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Date:	Tue, 22 Oct 2013 09:38:33 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Peter Chen <peter.chen@...escale.com>
Cc:	sameo@...ux.intel.com, b29396@...escale.com, shawn.guo@...aro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] mfd: syscon: return -ENXIO if CONFIG_MFD_SYSCON is
 not enabled

> Some platforms may not define CONFIG_MFD_SYSCON (or haven't syscon),
> it can fix build error for those platforms.
> 
> Signed-off-by: Peter Chen <peter.chen@...escale.com>
> ---
>  include/linux/mfd/syscon.h |   24 ++++++++++++++++++++++++
>  1 files changed, 24 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
> index b473577..60bf0fb 100644
> --- a/include/linux/mfd/syscon.h
> +++ b/include/linux/mfd/syscon.h
> @@ -17,10 +17,34 @@
>  
>  struct device_node;
>  
> +#if IS_ENABLED(CONFIG_MFD_SYSCON)

I'd prefer #ifdef.

>  extern struct regmap *syscon_node_to_regmap(struct device_node *np);
>  extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
>  extern struct regmap *syscon_regmap_lookup_by_pdevname(const char *s);
>  extern struct regmap *syscon_regmap_lookup_by_phandle(
>  					struct device_node *np,
>  					const char *property);
> +#else
> +static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
> +{
> +	return ERR_PTR(-ENXIO);

ENOSYS?

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