| Message ID | 871qe0y6aq.wl-kuninori.morimoto.gx@renesas.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | ASoC: makes CPU/Codec channel connection map more generic | expand |
Hey, On Thu, Oct 12, 2023 at 01:32:13AM +0000, Kuninori Morimoto wrote: > This patch adds ch-maps property to enable handling CPU:Codec = N:M > connection. > > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > --- > Documentation/devicetree/bindings/sound/audio-graph-port.yaml | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > index 60b5e3fd1115..3c4b331e8498 100644 > --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > @@ -19,6 +19,8 @@ definitions: > properties: > mclk-fs: > $ref: simple-card.yaml#/definitions/mclk-fs > + ch-maps: > + $ref: /schemas/types.yaml#/definitions/uint32-array Most of what I said on the last version applies here too. Only the s/_/-/ was done. Is there a reason you ignored those comments? Thanks, Conor. > > endpoint-base: > allOf: > -- > 2.25.1 >
Hi Conor Thank you for your feedback > > This patch adds ch-maps property to enable handling CPU:Codec = N:M > > connection. > > > > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > > --- (snip) > > + ch-maps: > > + $ref: /schemas/types.yaml#/definitions/uint32-array > > Most of what I said on the last version applies here too. Only the > s/_/-/ was done. Is there a reason you ignored those comments? Ah sorry. I thought you wanted was add your address on To/Cc for all patch-set. > I only got this one patch, so I have no context at all for this change. > Given that, and since I know almost nothing about sound stuff... (snip) > ...I have absolutely no idea how I would populate "ch_maps" correctly. > Please describe (in the binding) what this property actually does > & how to use it. Also, properties use -s not _s. Some Sound want to use multiple connections between CPUs (N) and Codecs (M). Current audio-graph-card2 driver is already supporting 1:N / N:1 / N:N connections, this patch expand it. These are implemented by using Of-Graph. For example N:N connection case, it is expressed like below. One note here is that cpu0/cpu1 and codec0/codec1 are *not* independent. We need to consider cpu0/cpu1 pair and codec0/codec1 pair. ep (endpoint) (A) (B) <- port -> <- port -> <- port -> <- port -> ax(ep) <--> (ep)bx cpu0(ep) <--> (ep)a0 b0(ep) <--> (ep)codec0 cpu1(ep) <--> (ep)a1 b1(ep) <--> (ep)codec1 In N:N case, it is assuming cpu0/codec0, and cpu1/codec1 has related. This patch expand (A)/(B) part to N:M (N != M). Then, ch-maps indicates how these are related. (A) (B) <- port -> <- port -> <- port -> <- port -> ax(ep) <--> (ep)bx cpu0(ep) <--> (ep)a0 b0(ep) <--> (ep)codec0 cpu1(ep) <--> (ep)a1 b1(ep) <--> (ep)codec1 => cpu2(ep) <--> (ep)a2 ch-maps = <0 0 1> ch-maps = <0 0 1> means, cpu0 <-> codec0 cpu1 <-> codec0 cpu2 <-> codec1 Thank you for your help !! Best regards --- Kuninori Morimoto
On Fri, Oct 13, 2023 at 12:33:34AM +0000, Kuninori Morimoto wrote: > > > + ch-maps: > > > + $ref: /schemas/types.yaml#/definitions/uint32-array > > I only got this one patch, so I have no context at all for this change. > > Given that, and since I know almost nothing about sound stuff... > (snip) > > ...I have absolutely no idea how I would populate "ch_maps" correctly. > > Please describe (in the binding) what this property actually does > > & how to use it. Also, properties use -s not _s. > Some Sound want to use multiple connections between CPUs (N) and Codecs (M). > Current audio-graph-card2 driver is already supporting 1:N / N:1 / N:N > connections, this patch expand it. Some of this explanation needs to go into the binding - someone reading the binding should really be able to figure out what numbers to put in there without looking at the code. > ch-maps = <0 0 1> means, > cpu0 <-> codec0 > cpu1 <-> codec0 > cpu2 <-> codec1 > Thank you for your help !! So probably somthing along the lines of saying "there should be one element in the array for each CPU DAI, this should be the CODEC number to route to" (that's probably still a bit unclear but roughly that).
On Fri, Oct 13, 2023 at 04:41:42PM +0100, Mark Brown wrote: > On Fri, Oct 13, 2023 at 12:33:34AM +0000, Kuninori Morimoto wrote: > > > > > + ch-maps: > > > > + $ref: /schemas/types.yaml#/definitions/uint32-array > > > > I only got this one patch, so I have no context at all for this change. > > > Given that, and since I know almost nothing about sound stuff... > > (snip) > > > ...I have absolutely no idea how I would populate "ch_maps" correctly. > > > Please describe (in the binding) what this property actually does > > > & how to use it. Also, properties use -s not _s. > > > Some Sound want to use multiple connections between CPUs (N) and Codecs (M). > > Current audio-graph-card2 driver is already supporting 1:N / N:1 / N:N > > connections, this patch expand it. > > Some of this explanation needs to go into the binding - someone reading > the binding should really be able to figure out what numbers to put in > there without looking at the code. Absolutely :) > > ch-maps = <0 0 1> means, > > cpu0 <-> codec0 > > cpu1 <-> codec0 > > cpu2 <-> codec1 What happens when you want to convey that codec0 & codec1 are both connected to cpu0 & codec2 is connected to cpu1? How would that be described in a DT? Or is that not something anyone would even want to do? > > Thank you for your help !! > > So probably somthing along the lines of saying "there should be one > element in the array for each CPU DAI, this should be the CODEC number > to route to" (that's probably still a bit unclear but roughly that).
Hi Conor > > Some of this explanation needs to go into the binding - someone reading > > the binding should really be able to figure out what numbers to put in > > there without looking at the code. > > Absolutely :) Indeed :) will do in v4 > > > ch-maps = <0 0 1> means, > > > cpu0 <-> codec0 > > > cpu1 <-> codec0 > > > cpu2 <-> codec1 > > What happens when you want to convey that codec0 & codec1 are both > connected to cpu0 & codec2 is connected to cpu1? > How would that be described in a DT? > Or is that not something anyone would even want to do? In such case, ch-maps is from codec. it will be like below. It is judged by number of cpu vs codec. [PATCH 3/4] has both case sample. cpu >= codec : CPU base cpu < codec : Codec base ch-maps = <0 0 1> codec0 <-> cpu0 codec1 <-> cpu0 codec2 <-> cpu1 Thank you for your help !! Best regards --- Kuninori Morimoto
On Mon, Oct 16, 2023 at 12:46:29AM +0000, Kuninori Morimoto wrote: > > Hi Conor > > > > Some of this explanation needs to go into the binding - someone reading > > > the binding should really be able to figure out what numbers to put in > > > there without looking at the code. > > > > Absolutely :) > > Indeed :) will do in v4 > > > > > ch-maps = <0 0 1> means, > > > > cpu0 <-> codec0 > > > > cpu1 <-> codec0 > > > > cpu2 <-> codec1 > > > > What happens when you want to convey that codec0 & codec1 are both > > connected to cpu0 & codec2 is connected to cpu1? > > How would that be described in a DT? > > Or is that not something anyone would even want to do? > > In such case, ch-maps is from codec. it will be like below. > It is judged by number of cpu vs codec. [PATCH 3/4] has both case sample. > > cpu >= codec : CPU base > cpu < codec : Codec base > > ch-maps = <0 0 1> > codec0 <-> cpu0 > codec1 <-> cpu0 > codec2 <-> cpu1 That seems like a very unintuitive interface. If there were 32 CPUs and 30 codecs, then it'd be very inconvenient for a human reader to grok the configuration. CPUs were to be disabled in the DT, could the meaning of the property invert? I am not really the best when it comes to audio (or media) bindings, but I am wondering if a phandle based approach would be better, where the codecs have phandles for their associated CPUs. Maybe Mark, Rob etc could comment if doing that sort of thing is not feasible. Cheers, Conor.
On Wed, Oct 18, 2023 at 12:34:01AM +0000, Kuninori Morimoto wrote: > > Hi Conor > > > That seems like a very unintuitive interface. If there were 32 CPUs and > > 30 codecs, then it'd be very inconvenient for a human reader to grok the > > configuration. > > I don't think such huge number connection will be used... Your binding allows for that though! I really don't like the number of elements inverting the meaning of the property. Also, this was not the only item in my mail. Why did you not respond to the other comments? Cheers, Conor. > Thank you for your help !! > > Best regards > --- > Kuninori Morimoto
On Wed, Oct 18, 2023 at 08:57:17AM +0100, Conor Dooley wrote: > On Wed, Oct 18, 2023 at 12:34:01AM +0000, Kuninori Morimoto wrote: > > > That seems like a very unintuitive interface. If there were 32 CPUs and > > > 30 codecs, then it'd be very inconvenient for a human reader to grok the > > > configuration. > > I don't think such huge number connection will be used... I suspect that if we run into systems with very large numbers of devices on a single bus they'll either want to do something more dynamic and use it as a switch or be very regular which makes writing things a lot more manageable. > Your binding allows for that though! > I really don't like the number of elements inverting the meaning of the > property. I have to say I'm not a big fan of that either. It might be easier to map each channel to a slot number on the link, each DAI could then have an independent map and the kernel could compare DAI slots to join things up.
On Fri, Oct 20, 2023 at 01:13:31AM +0000, Kuninori Morimoto wrote: > DT > (A) (B) > <- port -> <- port -> <- port -> <- port -> > ax(ep) <--> (ep)bx > map=<0> cpu0(ep) <--> (ep)a0 b0(ep) <--> (ep)codec0 map=<0> > map=<1> cpu1(ep) <--> (ep)a1 b1(ep) <--> (ep)codec1 map=<1 2> > map=<2> cpu2(ep) <--> (ep)a2 ~~~~~~~~~ I think that looks like what I was thinking of, yes. Might be misreading it though!
diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml index 60b5e3fd1115..3c4b331e8498 100644 --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml @@ -19,6 +19,8 @@ definitions: properties: mclk-fs: $ref: simple-card.yaml#/definitions/mclk-fs + ch-maps: + $ref: /schemas/types.yaml#/definitions/uint32-array endpoint-base: allOf:
This patch adds ch-maps property to enable handling CPU:Codec = N:M connection. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> --- Documentation/devicetree/bindings/sound/audio-graph-port.yaml | 2 ++ 1 file changed, 2 insertions(+)