Re: [PATCH v9 1/5] device property: Add fwnode_iomap()

Andy Shevchenko
2021-11-16T17:14:49Z

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@linux.intel.com>

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

> Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Signed-off-by: Anand Ashok Dumbre <anand.ashok.dumbre@xilinx.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