linux-kernel - Re: [PATCH] reset: Add non CONFIG_RESET

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Date:	Thu, 10 Oct 2013 11:51:16 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Stephen Warren <swarren@...dia.com>,
	Shawn Guo <shawn.guo@...aro.org>, Marek Vasut <marex@...x.de>
Subject: Re: [PATCH] reset: Add non CONFIG_RESET_CONTROLLER routines

Hi Ivan,

Am Donnerstag, den 10.10.2013, 12:14 +0300 schrieb Ivan T. Ivanov:
> From: "Ivan T. Ivanov" <iivanov@...sol.com>
> 
> Make sure client drivers will still build on systems
> without reset control support.

the stubs should at least return errors, but then this turns a compile
time error into a runtime error for devices that don't work without
being properly reset.

Please also refer to this thread:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/174758.html

regards
Philipp

> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Stephen Warren <swarren@...dia.com>
> Cc: Shawn Guo <shawn.guo@...aro.org>
> Cc: Marek Vasut <marex@...x.de>
> ---
>  include/linux/reset.h |   44 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/include/linux/reset.h b/include/linux/reset.h
> index 6082247..0df3e30 100644
> --- a/include/linux/reset.h
> +++ b/include/linux/reset.h
> @@ -4,6 +4,8 @@
>  struct device;
>  struct reset_control;
>  
> +#if defined(CONFIG_RESET_CONTROLLER)
> +
>  int reset_control_reset(struct reset_control *rstc);
>  int reset_control_assert(struct reset_control *rstc);
>  int reset_control_deassert(struct reset_control *rstc);
> @@ -14,4 +16,46 @@ struct reset_control *devm_reset_control_get(struct device *dev, const char *id)
>  
>  int device_reset(struct device *dev);
>  
> +#else /* !CONFIG_RESET_CONTROLLER */
> +
> +/*
> + * Make sure client drivers will still build on systems without
> + * reset control support.
> + */
> +static inline int reset_control_reset(struct reset_control *rstc)
> +{
> +	return 0;
> +}
> +
> +static inline int reset_control_assert(struct reset_control *rstc)
> +{
> +	return 0;
> +}
> +
> +static inline int reset_control_deassert(struct reset_control *rstc)
> +{
> +	return 0;
> +}
> +
> +static inline struct reset_control *
> +reset_control_get(struct device *dev, const char *id)
> +{
> +	return 0;
> +}
> +
> +static inline void reset_control_put(struct reset_control *rstc){}
> +
> +static inline struct reset_control *
> +devm_reset_control_get(struct device *dev, const char *id)
> +{
> +	return NULL;
> +}
> +
> +static inline int device_reset(struct device *dev)
> +{
> +	return 0;
> +}
> +
> +#endif
> +
>  #endif


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