Re: [Xen-devel] [PATCH v6 3/6] xen: Introduce a helper to read a u32 property in device tree.

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 08/09/2013 03:20 AM, Chen Baozi wrote:
> Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> ---
>  xen/common/device_tree.c      | 15 +++++++++++++++
>  xen/include/xen/device_tree.h | 11 +++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index 84d704d..a4701eb 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -574,6 +574,21 @@ const void *dt_get_property(const struct dt_device_node 
> *np,
>      return pp ? pp->value : NULL;
>  }
>  
> +bool_t dt_property_read_u32(const struct dt_device_node *np,
> +                         const char *name, u32 *out_value)
> +{
> +    u32 len;
> +    const __be32 *val;
> +
> +    val = dt_get_property(np, name, &len);
> +    if ( !val || len > sizeof(*out_value) )
> +        return 0;
> +
> +    *out_value = be32_to_cpup(val);
> +
> +    return 1;
> +}
> +
>  bool_t dt_device_is_compatible(const struct dt_device_node *device,
>                                 const char *compat)
>  {
> diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
> index 5a2a5c6..faf727f 100644
> --- a/xen/include/xen/device_tree.h
> +++ b/xen/include/xen/device_tree.h
> @@ -300,6 +300,17 @@ const void *dt_get_property(const struct dt_device_node 
> *np,
>                              const char *name, u32 *lenp);
>  
>  /**
> + * dt_property_read_u32 - Helper to read a u32 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_u32(const struct dt_device_node *np,
> +                            const char *name, u32 *out_value);
> +
> +/**
>   * Checks if the given "compat" string matches one of the strings in
>   * the device's "compatible" property
>   */
> 


-- 
Julien Grall

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