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From:   Daniel Baluta <daniel.baluta@gmail.com>
Date:   Thu, 8 Aug 2019 09:27:37 +0300
Message-ID: <CAEnQRZCmKXNxx=mjHRcn6rYQJxzaaPLL4WQf79RZ5Aqdzqcu3Q@mail.gmail.com>
Subject: Re: [Sound-open-firmware] [PATCH v2 3/5] ASoC: SOF: Add DT DSP device support
To:     Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc:     Daniel Baluta <daniel.baluta@nxp.com>,
        Marco Felsch <m.felsch@pengutronix.de>,
        Shawn Guo <shawnguo@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Aisheng Dong <aisheng.dong@nxp.com>,
        Peng Fan <peng.fan@nxp.com>, Anson Huang <anson.huang@nxp.com>,
        Devicetree List <devicetree@vger.kernel.org>,
        "S.j. Wang" <shengjiu.wang@nxp.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Paul Olaru <paul.olaru@nxp.com>,
        Rob Herring <robh+dt@kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Leonard Crestez <leonard.crestez@nxp.com>,
        Fabio Estevam <festevam@gmail.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        sound-open-firmware@alsa-project.org
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On Wed, Aug 7, 2019 at 6:28 PM Daniel Baluta <daniel.baluta@gmail.com> wrot=
e:
>
> On Wed, Aug 7, 2019 at 6:22 PM Pierre-Louis Bossart
> <pierre-louis.bossart@linux.intel.com> wrote:
> >
> >
> > >>>> +static int sof_dt_probe(struct platform_device *pdev)
> > >>>> +{
> > >>>> +     struct device *dev =3D &pdev->dev;
> > >>>> +     const struct sof_dev_desc *desc;
> > >>>> +     /*TODO: create a generic snd_soc_xxx_mach */
> > >>>> +     struct snd_soc_acpi_mach *mach;
> > >>>
> > >>> I wonder if you really need to use the same structures. For Intel w=
e get
> > >>> absolutely zero info from the firmware so rely on an ACPI codec ID =
as a
> > >>> key to find information on which firmware and topology to use, and =
which
> > >>> machine driver to load. You could have all this information in a DT=
 blob?
> > >>
> > >> Yes. I see your point. I will still need to make a generic structure=
 for
> > >> snd_soc_acpi_mach so that everyone can use sof_nocodec_setup functio=
n.
> > >>
> > >> Maybe something like this:
> > >>
> > >> struct snd_soc_mach {
> > >>    union {
> > >>    struct snd_soc_acpi_mach acpi_mach;
> > >>    struct snd_soc_of_mach of_mach;
> > >>    }
> > >> };
> > >>
> > >> and then change the prototype of sof_nocodec_setup.
> > >
> > > Hi Pierre,
> > >
> > > I fixed all the comments except the one above. Replacing snd_soc_acpi=
_mach
> > > with a generic snd_soc_mach is not trivial task.
> > >
> > > I wonder if it is acceptable to get the initial patches as they are
> > > now and later switch to
> > > generic ACPI/OF abstraction.
> > >
> > > Asking this because for the moment on the i.MX side I have only
> > > implemented no codec
> > > version and we don't probe any of the machine drivers we have.
> > >
> > > So, there is this only one member of snd_soc_acpi_mach that imx
> > > version is making use of:
> > >
> > >    mach->drv_name =3D "sof-nocodec";
> > >
> > > That's all.
> > >
> > > I think the change as it is now is very clean and non-intrusive. Late=
r
> > > we will get options to
> > > read firmware name and stuff from DT.
> > >
> > > Anyhow, I don't think we can get rid of snd_dev_desc structure on
> > > i.MX. This will be used
> > > to store the information read from DT:
> > >
> > > static struct sof_dev_desc sof_of_imx8qxp_desc =3D {
> > > =C2=BB       .default_fw_path =3D "imx/sof",
> > > =C2=BB       .default_tplg_path =3D "imx/sof-tplg",
> > > =C2=BB       .nocodec_fw_filename =3D "sof-imx8.ri",
> > > =C2=BB       .nocodec_tplg_filename =3D "sof-imx8-nocodec.tplg",
> > > =C2=BB       .ops =3D &sof_imx8_ops,
> > > };
> > >
> > > For the moment we will only use the default values.
> >
> > Yes, that's fine for now. If you don't have a real machine driver then
> > there's nothing urgent to change.
> >
> > Is the new version on GitHub?
>
> Not yet, will push it today and ping you.

PR updated: https://github.com/thesofproject/linux/pull/1048