[U-Boot] [PATCH v1 2/3] drivers: reset: Add a managed API to get reset controllers from the DT

[Jean-Jacques Hiblot <jjhiblot@ti.com>]

On 30/10/2019 02:48, Simon Glass wrote:
> On Mon, 30 Sep 2019 at 10:15, Jean-Jacques Hiblot <jjhiblot@ti.com> wrote:
>> Add managed functions to get a reset_ctl from the device-tree, based on a
>> name or an index.
>> Also add a managed functions to get a reset_ctl_bulk (array of reset_ctl)
>> from the device-tree.
>>
>> When the device is unbound, the reset controllers are automatically
>> released and the data structure is freed.
>>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
>> ---
>>
>>   drivers/reset/reset-uclass.c | 116 +++++++++++++++++++++++++++++-
>>   include/reset.h              | 135 ++++++++++++++++++++++++++++++++++-
>>   2 files changed, 247 insertions(+), 4 deletions(-)
> Reviewed-by: Simon Glass <sjg@chromium.org>
>
> I really don't like these ERR_PTR returns. I suppose they make the
> code easier to port, and we can be sure that pointers will not be in
> the last 4KB of address space?

It seems rather unlikely because the returned pointer points to actual 
RAM allocated from the heap. On most platforms I've worked with, the top 
of the address space is not dedicated to memory. If ever the need to fix 
this  arises it could done by tweaking the macros to use another unused 
address space.

JJ

>
> Regards,
> Simon
>