Re: [Xen-devel] [PATCH RFC 4/7] xen: arm: add two new device tree helpers

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 09/17/2013 02:40 AM, Ian Campbell wrote:
>  - dt_property_read_u64
>  - dt_find_node_by_type
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
>  xen/common/device_tree.c      | 29 +++++++++++++++++++++++++++++
>  xen/include/xen/device_tree.h | 16 ++++++++++++++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 3a3c99c..74a82bc 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -589,6 +589,21 @@ bool_t dt_property_read_u32(const struct dt_device_node 
> *np,
>      return 1;
>  }
>  
> +bool_t dt_property_read_u64(const struct dt_device_node *np,
> +                         const char *name, u64 *out_value)
> +{
> +    u32 len;
> +    const __be32 *val;
> +
> +    val = dt_get_property(np, name, &len);
> +    if ( !val || len < sizeof(*out_value) )
> +        return 0;
> +
> +    *out_value = dt_read_number(val, 2);
> +
> +    return 1;
> +}
> +
>  bool_t dt_device_is_compatible(const struct dt_device_node *device,
>                                 const char *compat)
>  {
> @@ -637,6 +652,20 @@ struct dt_device_node *dt_find_node_by_name(struct 
> dt_device_node *from,
>      return np;
>  }
>  
> +struct dt_device_node *dt_find_node_by_type(struct dt_device_node *from,
> +                                            const char *type)
> +{
> +    struct dt_device_node *np;
> +    struct dt_device_node *dt;
> +
> +    dt = from ? from->allnext : dt_host;
> +    for_each_device_node(dt, np)

Minor mistake, for_each_device_node was renamed to
dt_for_each_device_node in the current xen tree.

> +        if ( np->type && (dt_node_cmp(np->type, type) == 0) )
> +            break;
> +
> +    return np;
> +}
> +
>  struct dt_device_node *dt_find_node_by_path(const char *path)
>  {
>      struct dt_device_node *np;
> diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
> index 402cef2..3aa8452 100644
> --- a/xen/include/xen/device_tree.h
> +++ b/xen/include/xen/device_tree.h
> @@ -315,6 +315,16 @@ const void *dt_get_property(const struct dt_device_node 
> *np,
>   */
>  bool_t dt_property_read_u32(const struct dt_device_node *np,
>                              const char *name, u32 *out_value);
> +/**
> + * dt_property_read_u64 - Helper to read a u64 property.
> + * @np: node to get the value
> + * @name: name of the property
> + * @out_value: pointer to return value
> + *
> + * Return true if get the desired value.
> + */
> +bool_t dt_property_read_u64(const struct dt_device_node *np,
> +                            const char *name, u64 *out_value);
>  
>  /**
>   * Checks if the given "compat" string matches one of the strings in
> @@ -347,6 +357,12 @@ struct dt_device_node *dt_find_node_by_name(struct 
> dt_device_node *node,
>                                              const char *name);
>  
>  /**
> + * dt_find_node_by_name - Find a node by its "name" property
> + */
> +struct dt_device_node *dt_find_node_by_type(struct dt_device_node *from,
> +                                            const char *type);
> +
> +/**
>   * df_find_node_by_alias - Find a node matching an alias
>   * @alias: The alias to match
>   *
> 


-- 
Julien Grall

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