linux-kernel - Re: [PATCH v9 1/5] device property: Add fwnode

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Date:   Tue, 16 Nov 2021 19:07:33 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
Cc:     linux-kernel@...r.kernel.org, jic23@...nel.org, lars@...afoo.de,
        linux-iio@...r.kernel.org, git@...inx.com, michal.simek@...inx.com,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        linux-acpi@...r.kernel.org, heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH v9 1/5] device property: Add fwnode_iomap()

On Tue, Nov 16, 2021 at 03:08:38PM +0000, Anand Ashok Dumbre wrote:
> This patch introduces a new helper routine - fwnode_iomap(), which
> allows to map the memory mapped IO for a given device node.
> 
> This implementation does not cover the ACPI case and may be expanded
> in the future. The main purpose here is to be able to develop resource
> provider agnostic drivers.

Thanks! LGTM,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

TWIMC I have some ideas about ACPI implementation. Just let this one
settled first.

> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
> ---
>  drivers/base/property.c  | 16 ++++++++++++++++
>  include/linux/property.h |  2 ++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 453918eb7390..d2cca7ffea18 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -1021,6 +1021,22 @@ int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
>  }
>  EXPORT_SYMBOL(fwnode_irq_get);
>  
> +/**
> + * fwnode_iomap - Maps the memory mapped IO for a given fwnode
> + * @fwnode:	Pointer to the firmware node
> + * @index:	Index of the IO range
> + *
> + * Returns a pointer to the mapped memory.
> + */
> +void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
> +{
> +	if (is_of_node(fwnode))
> +		return of_iomap(to_of_node(fwnode), index);
> +
> +	return NULL;
> +}
> +EXPORT_SYMBOL(fwnode_iomap);
> +
>  /**
>   * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
>   * @fwnode: Pointer to the parent firmware node
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 357513a977e5..9bb0b0155402 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -121,6 +121,8 @@ void fwnode_handle_put(struct fwnode_handle *fwnode);
>  
>  int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
>  
> +void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
> +
>  unsigned int device_get_child_node_count(struct device *dev);
>  
>  static inline bool device_property_read_bool(struct device *dev,
> -- 
> 2.17.1
> 

-- 
With Best Regards,
Andy Shevchenko