linux-kernel - Re: [PATCH v1] device property: Add helpers to count items in an array

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Message-ID: <20190520125217.q65fkmqtizb54gnb@paasikivi.fi.intel.com>
Date:   Mon, 20 May 2019 15:52:17 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] device property: Add helpers to count items in an
 array

Hi Andy,

On Mon, May 20, 2019 at 03:38:48PM +0300, Andy Shevchenko wrote:
> The usual pattern to allocate the necessary space for an array of properties is
> to count them fist using:

s/fist/first/

With that,

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

> 
>   count = device_property_read_uXX_array(dev, propname, NULL, 0);
> 
> 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@...ux.intel.com>
> ---
>  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
> 

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com