Re: [PATCH 09/10] xen/device_tree: Add new helper to read arrays from a DTB

[Julien Grall <julien.grall@linaro.org>]

Hi Frediano,

On 11/03/2014 10:12 AM, Frediano Ziglio wrote:
> From: Zoltan Kiss <zoltan.kiss@linaro.org>
> 
> Signed-off-by: Zoltan Kiss <zoltan.kiss@huawei.com>
Reviewed-by: Julien Grall <julien.grall@linaro.org>

Regards,

> ---
>  xen/common/device_tree.c      | 14 ++++++++++----
>  xen/include/xen/device_tree.h | 11 +++++++++++
>  2 files changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
> index f72b2e9..e97c28b 100644
> --- a/xen/common/device_tree.c
> +++ b/xen/common/device_tree.c
> @@ -160,19 +160,25 @@ 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)
>  {
> -    u32 len;
> +    return dt_property_read_u32_array(np, name, out_value, 1);
> +}
> +
> +bool_t dt_property_read_u32_array(const struct dt_device_node *np,
> +                                  const char *name, u32 *out_value, u16 out_len)
> +{
> +    u32 len, i;
>      const __be32 *val;
>  
>      val = dt_get_property(np, name, &len);
> -    if ( !val || len < sizeof(*out_value) )
> +    if ( !val || len < sizeof(*out_value) * out_len )
>          return 0;
>  
> -    *out_value = be32_to_cpup(val);
> +    for ( i = 0; i < out_len; i++, val++ )
> +        out_value[i] = be32_to_cpup(val);
>  
>      return 1;
>  }
>  
> -
>  bool_t dt_property_read_u64(const struct dt_device_node *np,
>                           const char *name, u64 *out_value)
>  {
> diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
> index 08db8bc..5fcd9c4 100644
> --- a/xen/include/xen/device_tree.h
> +++ b/xen/include/xen/device_tree.h
> @@ -346,6 +346,17 @@ const struct dt_property *dt_find_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_u32_array - Helper to read a u32 array property.
> + * @np: node to get the value
> + * @name: name of the property
> + * @out_value: pointer to return value
> + * @out_len: lenght of the array
> + *
> + * Return true if get the desired value.
> + */
> +bool_t dt_property_read_u32_array(const struct dt_device_node *np,
> +                                  const char *name, u32 *out_value, u16 out_len);
> +/**
>   * dt_property_read_u64 - Helper to read a u64 property.
>   * @np: node to get the value
>   * @name: name of the property
> 


-- 
Julien Grall