linux-kernel - Re: [PATCH v3] arm64: dts: imx8mq: Add sai3 and sai6 nodes

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Message-ID: <9e196ce51eac9ce9c327198c4a2911a8@www.akkea.ca>
Date:   Wed, 03 Jul 2019 07:12:51 -0600
From:   Angus Ainslie <angus@...ea.ca>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     Andra Danciu <andradanciu1997@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>,
        Anson Huang <Anson.Huang@....com>, andrew.smirnov@...il.com,
        Carlo Caione <ccaione@...libre.com>,
        Guido Günther <agx@...xcpu.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] arm64: dts: imx8mq: Add sai3 and sai6 nodes

Hi Daniel,

On 2019-07-03 07:10, Daniel Baluta wrote:
> On Wed, Jul 3, 2019 at 4:01 PM Angus Ainslie <angus@...ea.ca> wrote:
>> 
>> Hi Andra,
>> 
>> I tried this out on linux-next and I'm not able to record or play 
>> sound.
>> 
>> I also added the sai2 entry to test out our devkit and get a PCM 
>> timeout
>> with that.
> 
> Hi Angus,
> 
> There are still lots of SAI patches that need to be upstream. Me and 
> Andra
> will be working on that over this summer.
> 
>> 
>> On 2019-07-02 07:23, Andra Danciu wrote:
>> > SAI3 and SAI6 nodes are used to connect to an external codec.
>> > They have 1 Tx and 1 Rx dataline.
>> >
>> > Cc: Daniel Baluta <daniel.baluta@....com>
>> > Signed-off-by: Andra Danciu <andradanciu1997@...il.com>
>> > ---
>> > Changes since v2:
>> >       - removed multiple new lines
>> >
>> > Changes since v1:
>> >       - Added sai3 node because we need it to enable audio on pico-pi-8m
>> >       - Added commit description
>> >
>> >  arch/arm64/boot/dts/freescale/imx8mq.dtsi | 29
>> > +++++++++++++++++++++++++++++
>> >  1 file changed, 29 insertions(+)
>> >
>> > diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
>> > b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
>> > index d09b808eff87..736cf81b695e 100644
>> > --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
>> > +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
>> > @@ -278,6 +278,20 @@
>> >                       #size-cells = <1>;
>> >                       ranges = <0x30000000 0x30000000 0x400000>;
>> >
>> > +                     sai6: sai@...30000 {
>> > +                             compatible = "fsl,imx8mq-sai",
>> 
>> I don't find this compatible string in sound/soc/fsl/fsl_sai.c. Aren't
>> the registers at a different offset from "fsl,imx6sx-sai".
> 
> Yes, you are right on this. We are trying to slowly push all our 
> internal-tree
> patches to mainline. Obviously, with started with low hanging fruits, 
> DTS
> nodes and small SAI fixes.
> 
> Soon, we will start to send patches for SAI IP ipgrade for imx8.
> 
>> 
>> How is this supposed to work ?
>> 
> 
> For the moment it won't work unless we will upstream all our SAI
> internal patches.
> But we will get there hopefully this summer.
> 

Shouldn't a working driver be upstream before enabling it in the 
devicetree ?

Thanks
Angus

> Thanks,
> Daniel.