linux-kernel - Re: [PATCH v6 3/5] of/platform: Add stubs for of_platform_device

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Date:   Thu, 8 Apr 2021 10:21:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Frank Rowand <frowand.list@...il.com>,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Peter Chen <peter.chen@....com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-usb@...r.kernel.org,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Bastien Nocera <hadess@...ess.net>, devicetree@...r.kernel.org,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH v6 3/5] of/platform: Add stubs for
 of_platform_device_create/destroy()

On Mon, Apr 05, 2021 at 01:18:15PM -0700, Matthias Kaehlcke wrote:
> Code for platform_device_create() and of_platform_device_create() is

platform_device_create()?

> only generated if CONFIG_OF_ADDRESS=y. Add stubs to avoid unresolved
> symbols when CONFIG_OF_ADDRESS is not set.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> 
> Changes in v7:
> - none
> 
> Changes in v6:
> - patch added to the series
> 
>  include/linux/of_platform.h | 22 ++++++++++++++++++----
>  1 file changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h
> index 84a966623e78..d15b6cd5e1c3 100644
> --- a/include/linux/of_platform.h
> +++ b/include/linux/of_platform.h
> @@ -61,16 +61,18 @@ static inline struct platform_device *of_find_device_by_node(struct device_node
>  }
>  #endif
>  
> +extern int of_platform_bus_probe(struct device_node *root,
> +				 const struct of_device_id *matches,
> +				 struct device *parent);

This is also only built for CONFIG_OF_ADDRESS. But there's no need for 
an empty function as it is powerpc only and should never have a new 
user.

> +
> +#ifdef CONFIG_OF_ADDRESS
>  /* Platform devices and busses creation */
>  extern struct platform_device *of_platform_device_create(struct device_node *np,
>  						   const char *bus_id,
>  						   struct device *parent);
>  
>  extern int of_platform_device_destroy(struct device *dev, void *data);
> -extern int of_platform_bus_probe(struct device_node *root,
> -				 const struct of_device_id *matches,
> -				 struct device *parent);
> -#ifdef CONFIG_OF_ADDRESS
> +
>  extern int of_platform_populate(struct device_node *root,
>  				const struct of_device_id *matches,
>  				const struct of_dev_auxdata *lookup,
> @@ -84,6 +86,18 @@ extern int devm_of_platform_populate(struct device *dev);
>  
>  extern void devm_of_platform_depopulate(struct device *dev);
>  #else
> +/* Platform devices and busses creation */
> +static inline struct platform_device *of_platform_device_create(struct device_node *np,
> +								const char *bus_id,
> +								struct device *parent)
> +{
> +	return NULL;
> +}
> +static inline int of_platform_device_destroy(struct device *dev, void *data)
> +{
> +	return -ENODEV;
> +}
> +
>  static inline int of_platform_populate(struct device_node *root,
>  					const struct of_device_id *matches,
>  					const struct of_dev_auxdata *lookup,
> -- 
> 2.31.0.208.g409f899ff0-goog
>