From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH v2 08/15] xen/arm: use device api to detect
	GIC version
Date: Wed, 09 Apr 2014 15:32:24 +0100
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To: Vijay Kilari <vijay.kilari@gmail.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Prasun Kapoor <Prasun.Kapoor@caviumnetworks.com>, Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>, xen-devel@lists.xen.org, Stefano Stabellini <stefano.stabellini@citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 04/09/2014 03:28 PM, Vijay Kilari wrote:
>>> +
>>> +    dt_for_each_device_node(dt_host, node)
>>> +    {
>>> +        rc = device_init(node, DEVICE_GIC, NULL);
>>> +        if ( !rc )
>>> +            num_gics++;
>>
>> Xen only supports a single GIC for now. You have to initialized the
>> correct one (see dt_find_interrupt_controller).
> 
> dt_find_interrupt_controller expects compatibility string as below to fetch
> the gic node which can be passed to device_init().
> 
> static const struct dt_device_match gic_ids[] __initconst =
>     {
>         DT_MATCH_GIC,
>         { /* sentinel */ },
>     };
> 
> In such case, generic driver has to pass compatibility strings of both
> GIC v3 & GIC v2 to find the node in dt. Is this ok?
> 
> Other way is to break when num_gics = 1 when it finds the first gic node.

Why can't you modify dt_find_interrupt_controller? Or even better, take
the code from it and use it directly in your function...

-- 
Julien Grall