Messages in this thread | | | From | jiada <> | Subject | Re: [PATCH v1 0/2] rsnd: dts: change to use extended audio dmac register | Date | Fri, 22 Feb 2019 12:05:02 +0900 |
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Hi Geert
On 2019/02/20 17:10, Kuninori Morimoto wrote: > > Hi Geert > >>> According to user reference manual for R-CAR H3 and M3-W SoCs, >>> in order to access busif4 ~ busif7, extended audio dmac registers >>> (PDMASAREn, PDMADAREn, PDMACHCREn) >>> need to be used, rather than basic audio dmac registers >>> (PDMASARn, PDMADARn, PDMACHCRn) >>> >>> This patch set updates H3 (= r8a7795) and M3-W (= r8a7796) >>> to use extended audio dmac registers >> >> The same change should be applied for M3-N and RZ/G2M, right? >> Currently only H3 and M3-W support to use busif other than busif0, I feel currently it's only necessary to use extended audio dmac register for these SoCs
>> R-Car E3 and RZ/G2E already use the extended register set, as they do not >> have the basic set. >> >> For SoCs having both, this feels a bit like describing software policy, instead >> of hardware, to me. Would it make sense to extend the audio bindings, and >> allow describing both the basic and extended register sets, and let the driver >> make the decision which one to use? > > I don't think we need to use basic register. > This means extended register only is very enough. > I'm not sure why datasheet is indicating basic... > Extended audio dmac registers covers all function of basic ones, so there is no need to use basic registers
Thanks, Jiada
> Best regards > --- > Kuninori Morimoto >
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