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SubjectRe: [PATCH V6 3/5] OF: Add missing I/O range exception for indirect-IO devices
On 27/01/2017 22:03, Rob Herring wrote:
> On Tue, Jan 24, 2017 at 03:05:23PM +0800, zhichang.yuan wrote:
>> There are some special ISA/LPC devices that work on a specific I/O range where
>> it is not correct to specify a 'ranges' property in DTS parent node as cpu
>> addresses translated from DTS node are only for memory space on some
>> architectures, such as Arm64. Without the parent 'ranges' property, current
>> of_translate_address() return an error.
>> Here we add special handlings for this case.
>> During the OF address translation, some checkings will be perfromed to
>> identify whether the device node is registered as indirect-IO. If yes, the I/O
>> translation will be done in a different way from that one of PCI MMIO.
>> In this way, the I/O 'reg' property of the special ISA/LPC devices will be
>> parsed correctly.
>> Signed-off-by: zhichang.yuan <>
>> Signed-off-by: Gabriele Paoloni <>
>> Signed-off-by: Arnd Bergmann <>
> Shouldn't this be Reviewed-by?

The background is that Zhichang is following a sketch of a re-worked
driver from Arnd, which Arnd gave Signed-off-by. But this patch does not
follow it verbatim.

I think this patchset should be resent without Arnd's signature. Or Arnd
may kindly review and say it's ok.


> Otherwise, looks fine to me.
> Acked-by: Rob Herring <>
>> ---
>> drivers/of/address.c | 87 ++++++++++++++++++++++++++++++++++++++++++----------
>> 1 file changed, 71 insertions(+), 16 deletions(-)
> .

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