[PATCH v2 5/5] ARM: dts: r8a7794: add sound support

[Simon Horman]

On Wed, Feb 17, 2016 at 10:07:50PM +0300, Sergei Shtylyov wrote:
> On 02/17/2016 08:38 AM, Simon Horman wrote:
> 
> >>>>>>>>>Define the generic R8A7794 part of  the sound device node.
> >>>>>>>>>This sound device  is a complex one and comprises the Audio Clock Generator
> >>>>>>>>>(ADG), Sampling Rate Converter Unit (SCU), Serial Sound Interface [Unit]
> >>>>>>>>>(SSI[U]), and Audio DMAC-Peripheral-Peripheral.
> >>>>>>>>>It is up  to the board file to enable the device.
> >>>>>>>>>
> >>>>>>>>>This patch is based on the R8A7791 sound work by Kuninori Morimoto.
> >>>>>>>>>
> >>>>>>>>>Signed-off-by: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
> >>>>>>>>(snip)
> >>>>>>>>>+		rcar_sound,src {
> >>>>>>>>>+			src1: src at 1 {
> >>>>>>>>>+				interrupts = <GIC_SPI 353 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x87>, <&audma0 0x9c>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+			src2: src at 2 {
> >>>>>>>>>+				interrupts = <GIC_SPI 354 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x89>, <&audma0 0x9e>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+			src3: src at 3 {
> >>>>>>>>>+				interrupts = <GIC_SPI 355 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x8b>, <&audma0 0xa0>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+			src4: src at 4 {
> >>>>>>>>>+				interrupts = <GIC_SPI 356 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x8d>, <&audma0 0xb0>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+			src5: src at 5 {
> >>>>>>>>>+				interrupts = <GIC_SPI 357 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x8f>, <&audma0 0xb2>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+			src6: src at 6 {
> >>>>>>>>>+				interrupts = <GIC_SPI 358 IRQ_TYPE_LEVEL_HIGH>;
> >>>>>>>>>+				dmas = <&audma0 0x91>, <&audma0 0xb4>;
> >>>>>>>>>+				dma-names = "rx", "tx";
> >>>>>>>>>+			};
> >>>>>>>>>+		};
> >>>>>>>>
> >>>>>>>>I think this can't work correctly, because driver is assuming
> >>>>>>>>DT has all channles (from 0). (see linux/sound/soc/sh/rcar/src.c :: rsnd_src_probe)
> >>>>>>>>Can you adds dummy src0 with some comments ? or fix src.c driver ?
> >>>>>>>
> >>>>>>>I would prefer the driver to be fixed (I had a similar patchset locally
> >>>>>>>and I found it doesn't work).
> >>>>>>
> >>>>>>    You mean you had R8A7794 sound patch set too?
> >>>>>
> >>>>>Yes, I was working on it recently.
> >>>>>I suppose we should coordinate these things in future to avoid
> >>>>>duplicated effort.
> >>>>
> >>>>    Yes, seems a good idea now. :-)
> >>>>
> >>>>>>>The reason is that DT should describe
> >>>>>>>the hardware rather than the current state of the software.
> >>>>>>
> >>>>>>    Yes, of course. Just tell me do I have to fix the driver *before* this
> >>>>>>patch set is accepted?
> >>>>
> >>>>>I did not entirely get to the bottom of the problem, but I think that at
> >>>>>the very least something needs to be done about the for_each_rsnd_src()
> >>>>>loop in rsnd_src_probe.
> >>>>
> >>>>    It's not that it replies to my question. :-)
> >>>>    So you're looking at this issue yourself?
> >>>
> >>>I have not got very far, as you can see, but I was planning to look into it.
> >>>I don't mind if you want to do so.
> >>
> >>    After consultation with the management, I'm going to look into this issue
> >>myself. :-)
> >
> >Excellent.
> 
>    But not immediately. I have some other things to look at before that (DU
> and AVB), they'll going to take some (significant) time... :-(
> 
> >FWIW, I can test anything you come up with for the r8a7794 an alt board
> 
>    I have remote access to Alt now, in fact using it currently for the AVB work.
> 
> >or post patches for it once you have r8a7794/silk sorted out.
> 
>    I already have audio on these working. Or you're going to wait until I
> fix the SRC issue?

I'm happy to merge a subset of your r8a7794/silk patches,
that don't touch the SRC issue if you think that is appropriate.
>From there I could get similar functionality running on the Alt - I don't
expect that to be a difficult task. And then when you come back to the SRC
issue we can enhance support for r8a7794/silk,alt.