[PATCH 02/11] dt-bindings: serial: snps-dw-apb-uart: Relax dma-names order constraint

Cristian Ciocaltea cristian.ciocaltea at collabora.com
Fri Mar 17 03:21:41 PDT 2023

On 3/17/23 10:31, Krzysztof Kozlowski wrote:
> On 15/03/2023 12:47, Cristian Ciocaltea wrote:
>> Commit 370f696e4474 ("dt-bindings: serial: snps-dw-apb-uart: add dma &
>> dma-names properties") documented dma-names property to handle Allwiner
>> D1 dtbs_check warnings, but relies on a strict rx->tx ordering, which is
>> the reverse of what a different board expects:
>>    rk3326-odroid-go2.dtb: serial at ff030000: dma-names:0: 'rx' was expected
>> A quick and incomplete check shows the inconsistency is present in many
>> other DT files:
> Why not fixing the DTS? The properties should have fixed order.

I was initially concerned about the risk of a potential ABI breakage, 
but I think that's not really a problem since dma-names is not directly 
accessed in the driver and DT Kernel API doesn't rely on a particular order.

If there are no objections, I would switch the order in the binding to 
tx->rx, since that's what most of the DTS use, and fix the remaining ones.

> Best regards,
> Krzysztof


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