Re: [Xen-devel] [RFC v2 2/7] arm64: Add definitions for fwnode_handle

["Goel, Sameer" <sgoel@xxxxxxxxxxxxxx>]

On 10/24/2017 8:08 AM, Julien Grall wrote:
> Hi Sameer,
> 
> On 19/10/17 15:53, Goel, Sameer wrote:
>> On 10/12/2017 6:45 AM, Julien Grall wrote:
>>> On 21/09/17 01:37, Sameer Goel wrote:
>>>> This will be used as a device property to match the DMA capable devices
>>>> with the associated SMMU. The header file is a port from linux. The code
>>>> was changed to remove the types that were not needed for Xen.
>>>
>>> I think you probably want a bit more context in the commit message about 
>>> implement fwnode.h in common code.
>>>
>>> Within this series, fwnode seems to only be used by Arm. So what would be 
>>> the advantage to get that in xen/? Is it going to be used by x86 or taken 
>>> advantage in common code?
>>>
>>>>
>>>> Linux ChangeId:ce793486e23e: driver core / ACPI: Represent ACPI
>>>> companions using fwnode_handle
>>>>
>>>> Signed-off-by: Sameer Goel <sgoel@xxxxxxxxxxxxxx>
>>>> ---
>>>>    xen/include/asm-arm/device.h |  2 ++
>>>>    xen/include/xen/fwnode.h     | 33 +++++++++++++++++++++++++++++++++
>>>>    2 files changed, 35 insertions(+)
>>>>    create mode 100644 xen/include/xen/fwnode.h
>>>>
>>>> diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
>>>> index 6734ae8..78c38fe 100644
>>>> --- a/xen/include/asm-arm/device.h
>>>> +++ b/xen/include/asm-arm/device.h
>>>> @@ -2,6 +2,7 @@
>>>>    #define __ASM_ARM_DEVICE_H
>>>>      #include <xen/init.h>
>>>> +#include <xen/fwnode.h>
>>>>      enum device_type
>>>>    {
>>>> @@ -19,6 +20,7 @@ struct device
>>>>    #ifdef CONFIG_HAS_DEVICE_TREE
>>>>        struct dt_device_node *of_node; /* Used by drivers imported from 
>>>> Linux */
>>>
>>> I was expecting a todo in the code after the discussion about leave of_node 
>>> here.
>>>
>>>>    #endif
>>>> +    struct fwnode_handle *fwnode; /*fw device node identifier */
>> The fwnode handle was provide a match cookie for the SMMUs and not much 
>> else. Even with this around we will need the
>> dt info in the device node. I agree that this rolls up into fw spec and I 
>> can look at the code cleanup for the next patch.
> 
> A clean-up patch would be great but not necessary. What I expect is a TODO 
> mentioning the possible clean-up.
> 
I looked through the Linux code a bit more. The reason for pulling in the 
fwnode was to port the iort code as is. So, really I do not need this at all. 
All I need is a dummy struct for fwnode.

I will remove this header file and add a new definition in the linux compat 
header. What is a good location for this header?
> Cheers,
> 

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