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SubjectRe: [PATCH v2] device property: Add helpers to count items in an array
On Mon, May 20, 2019 at 04:50:04PM +0300, Andy Shevchenko wrote:
> The usual pattern to allocate the necessary space for an array of properties is
> to count them first by calling:
>
> count = device_property_read_uXX_array(dev, propname, NULL, 0);
> if (count < 0)
> return count;
>
> Introduce helpers device_property_count_uXX() to count items by supplying hard
> coded last two parameters to device_property_readXX_array().
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

Rafael, can be this applied if you have no objections?

> ---
> - gathered tags
> - rephrase a bit the commit message and fix a typo (Sakari)
> include/linux/property.h | 44 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/include/linux/property.h b/include/linux/property.h
> index a29369c89e6e..65e31c090f9f 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -144,6 +144,26 @@ static inline int device_property_read_u64(struct device *dev,
> return device_property_read_u64_array(dev, propname, val, 1);
> }
>
> +static inline int device_property_count_u8(struct device *dev, const char *propname)
> +{
> + return device_property_read_u8_array(dev, propname, NULL, 0);
> +}
> +
> +static inline int device_property_count_u16(struct device *dev, const char *propname)
> +{
> + return device_property_read_u16_array(dev, propname, NULL, 0);
> +}
> +
> +static inline int device_property_count_u32(struct device *dev, const char *propname)
> +{
> + return device_property_read_u32_array(dev, propname, NULL, 0);
> +}
> +
> +static inline int device_property_count_u64(struct device *dev, const char *propname)
> +{
> + return device_property_read_u64_array(dev, propname, NULL, 0);
> +}
> +
> static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
> const char *propname)
> {
> @@ -174,6 +194,30 @@ static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
> return fwnode_property_read_u64_array(fwnode, propname, val, 1);
> }
>
> +static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
> + const char *propname)
> +{
> + return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
> +}
> +
> +static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
> + const char *propname)
> +{
> + return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
> +}
> +
> +static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
> + const char *propname)
> +{
> + return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
> +}
> +
> +static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
> + const char *propname)
> +{
> + return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
> +}
> +
> /**
> * struct property_entry - "Built-in" device property representation.
> * @name: Name of the property.
> --
> 2.20.1
>

--
With Best Regards,
Andy Shevchenko


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