Re: [Xen-devel] [PATCH v2 09/15] xen: arm: Handle cpus nodes with #address-cells > 1

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 11/22/2013 04:24 PM, Ian Campbell wrote:
> The APM X-Gene Mustang board DTS has #address-cells = 2.
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
> v2: Use dt_read_number, check the property length
> ---
>   xen/arch/arm/smpboot.c |   34 +++++++++++++++++++++++++++++-----
>   1 file changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
> index 6c90fa6..b6a1307 100644
> --- a/xen/arch/arm/smpboot.c
> +++ b/xen/arch/arm/smpboot.c
> @@ -125,18 +125,42 @@ void __init smp_init_cpus(void)
>
>       dt_for_each_child_node( cpus, cpu )
>       {
> -        u32 hwid;
> +        const __be32 *prop;
> +        u64 addr;
> +        u32 reg_len, hwid;
>
>           if ( !dt_device_type_is_equal(cpu, "cpu") )
>               continue;
>
> -        if ( !dt_property_read_u32(cpu, "reg", &hwid) )
> +        if ( dt_n_size_cells(cpu) != 0 )
> +            printk(XENLOG_WARNING "cpu node `%s`: #size-cells %d\n",
> +                   dt_node_full_name(cpu), dt_n_size_cells(cpu));
> +
> +        prop = dt_get_property(cpu, "reg", &reg_len);
> +        if ( !prop )
> +        {
> +            printk(XENLOG_WARNING "cpu node `%s`: has no reg property\n",
> +                   dt_node_full_name(cpu));
> +            continue;
> +        }
> +
> +        if ( reg_len < dt_n_addr_cells(cpu) )
dt_n_addr_cells is the number of cells not in bytes.

You must use dt_cells_to_size(dt_nr_addr_cells(cpu)), perhaps an helper 
would be useful here.
--
Julien Grall

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