linux-kernel - Re: [RESEND PATCH v6 1/4] mfd: syscon: Add fwnode_to

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Message-ID: <20200417093551.GH2167633@dell>
Date:   Fri, 17 Apr 2020 10:35:51 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Dilip Kota <eswara.kota@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, kishon@...com,
        devicetree@...r.kernel.org, arnd@...db.de, robh@...nel.org,
        andriy.shevchenko@...el.com, cheol.yong.kim@...el.com,
        chuanhua.lei@...ux.intel.com, qi-ming.wu@...el.com,
        yixin.zhu@...el.com
Subject: Re: [RESEND PATCH v6 1/4] mfd: syscon: Add fwnode_to_regmap

On Mon, 06 Apr 2020, Dilip Kota wrote:

> Traverse regmap handle entry from firmware node handle.
> 
> Signed-off-by: Dilip Kota <eswara.kota@...ux.intel.com>
> ---
> Changes on v5:
>   No changes
>   
> Changes on v5:
>   No changes
> 
> Changes on v4:
>   No changes
> 
>  drivers/mfd/syscon.c       | 8 ++++++++
>  include/linux/mfd/syscon.h | 6 ++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 3a97816d0cba..e085c50816b9 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -178,6 +178,14 @@ struct regmap *device_node_to_regmap(struct device_node *np)
>  }
>  EXPORT_SYMBOL_GPL(device_node_to_regmap);
>  
> +struct regmap *fwnode_to_regmap(struct fwnode_handle *fwnode)
> +{
> +	struct device_node *np = to_of_node(fwnode);

You are assuming that the fwnode was Device Tree pointer.

The point of a fwnode is that it could be one of multiple types.

What if it was a pointer to an ACPI property?

> +	return device_node_get_regmap(np, false);
> +}
> +EXPORT_SYMBOL_GPL(fwnode_to_regmap);
> +
>  struct regmap *syscon_node_to_regmap(struct device_node *np)
>  {
>  	if (!of_device_is_compatible(np, "syscon"))
> diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
> index 7f20e9b502a5..dacab0b4a091 100644
> --- a/include/linux/mfd/syscon.h
> +++ b/include/linux/mfd/syscon.h
> @@ -18,6 +18,7 @@ struct device_node;
>  
>  #ifdef CONFIG_MFD_SYSCON
>  extern struct regmap *device_node_to_regmap(struct device_node *np);
> +extern struct regmap *fwnode_to_regmap(struct fwnode_handle *fwnode);
>  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(
> @@ -34,6 +35,11 @@ static inline struct regmap *device_node_to_regmap(struct device_node *np)
>  	return ERR_PTR(-ENOTSUPP);
>  }
>  
> +static inline struct regmap *fwnode_to_regmap(struct fwnode_handle *fwnode)
> +{
> +	return ERR_PTR(-ENOTSUPP);
> +}
> +
>  static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
>  {
>  	return ERR_PTR(-ENOTSUPP);

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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