linux-kernel - Re: [PATCH] mfd/syscon: Add device_node_to

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Date:   Tue, 23 Jul 2019 22:35:25 -0400
From:   Paul Cercueil <paul@...pouillou.net>
To:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>
Cc:     od@...c.me, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd/syscon: Add device_node_to_regmap()

Actually I'll make a revised version and merge it with a patchset that
makes use of this feature.

-Paul



Le mar. 23 juil. 2019 à 14:55, Paul Cercueil <paul@...pouillou.net> a 
écrit :
> device_node_to_regmap() is exactly like syscon_node_to_regmap(), but 
> it
> does not check that the node is compatible with "syscon".
> 
> The rationale behind this, is that one device node with a standard
> compatible string "foo,bar" can be covered by multiple drivers 
> sharing a
> regmap, or by a single driver doing all the job without a regmap, but
> these are implementation details which shouldn't reflect on the
> devicetree.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/mfd/syscon.c       | 14 ++++++++++----
>  include/linux/mfd/syscon.h |  6 ++++++
>  2 files changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index b65e585fc8c6..3dcb56d4688d 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -51,9 +51,6 @@ static struct syscon *of_syscon_register(struct 
> device_node *np)
>  	struct regmap_config syscon_config = syscon_regmap_config;
>  	struct resource res;
> 
> -	if (!of_device_is_compatible(np, "syscon"))
> -		return ERR_PTR(-EINVAL);
> -
>  	syscon = kzalloc(sizeof(*syscon), GFP_KERNEL);
>  	if (!syscon)
>  		return ERR_PTR(-ENOMEM);
> @@ -150,7 +147,7 @@ static struct syscon *of_syscon_register(struct 
> device_node *np)
>  	return ERR_PTR(ret);
>  }
> 
> -struct regmap *syscon_node_to_regmap(struct device_node *np)
> +struct regmap *device_node_to_regmap(struct device_node *np)
>  {
>  	struct syscon *entry, *syscon = NULL;
> 
> @@ -172,6 +169,15 @@ struct regmap *syscon_node_to_regmap(struct 
> device_node *np)
> 
>  	return syscon->regmap;
>  }
> +EXPORT_SYMBOL_GPL(device_node_to_regmap);
> +
> +struct regmap *syscon_node_to_regmap(struct device_node *np)
> +{
> +	if (!of_device_is_compatible(np, "syscon"))
> +		return ERR_PTR(-EINVAL);
> +
> +	return device_node_to_regmap(np);
> +}
>  EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
> 
>  struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
> diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
> index 8cfda0554381..112dc66262cc 100644
> --- a/include/linux/mfd/syscon.h
> +++ b/include/linux/mfd/syscon.h
> @@ -17,12 +17,18 @@
>  struct device_node;
> 
>  #ifdef CONFIG_MFD_SYSCON
> +extern struct regmap *device_node_to_regmap(struct device_node *np);
>  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_phandle(
>  					struct device_node *np,
>  					const char *property);
>  #else
> +static inline struct regmap *device_node_to_regmap(struct 
> device_node *np)
> +{
> +	return ERR_PTR(-ENOTSUPP);
> +}
> +
>  static inline struct regmap *syscon_node_to_regmap(struct 
> device_node *np)
>  {
>  	return ERR_PTR(-ENOTSUPP);
> --
> 2.21.0.593.g511ec345e18
>