linux-kernel - Re: [linux-sunxi] [PATCH v5 1/3] arm64: dts: allwinner: Add SPDIF node for Allwinner H6

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Date:   Mon, 12 Aug 2019 12:52:59 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v5 1/3] arm64: dts: allwinner: Add SPDIF
 node for Allwinner H6

Hi,

On Mon, Aug 12, 2019 at 4:31 AM Clément Péron <peron.clem@...il.com> wrote:
>
> The Allwinner H6 has a SPDIF controller called OWA (One Wire Audio).
>
> Only one pinmuxing is available so set it as default.
>
> Signed-off-by: Clément Péron <peron.clem@...il.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 38 ++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> index 7628a7c83096..677eb374678d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> @@ -83,6 +83,24 @@
>                 method = "smc";
>         };
>
> +       sound-spdif {
> +               compatible = "simple-audio-card";
> +               simple-audio-card,name = "sun50i-h6-spdif";
> +
> +               simple-audio-card,cpu {
> +                       sound-dai = <&spdif>;
> +               };
> +
> +               simple-audio-card,codec {
> +                       sound-dai = <&spdif_out>;
> +               };
> +       };
> +
> +       spdif_out: spdif-out {
> +               #sound-dai-cells = <0>;
> +               compatible = "linux,spdif-dit";
> +       };
> +

We've always had this part in the board dts. It isn't relevant to boards
that don't have SPDIF output.

Also, not so relevant here, but there are different simple sound card
constructs. Some support multiple audio streams with dynamic PCM routing.
How these are configured really depends on what interfaces are usable.

So keeping this at the board level is IMO a better choice.

ChenYu


>         timer {
>                 compatible = "arm,armv8-timer";
>                 interrupts = <GIC_PPI 13
> @@ -282,6 +300,11 @@
>                                 bias-pull-up;
>                         };
>
> +                       spdif_tx_pin: spdif-tx-pin {
> +                               pins = "PH7";
> +                               function = "spdif";
> +                       };
> +
>                         uart0_ph_pins: uart0-ph-pins {
>                                 pins = "PH0", "PH1";
>                                 function = "uart0";
> @@ -411,6 +434,21 @@
>                         };
>                 };
>
> +               spdif: spdif@...3000 {
> +                       #sound-dai-cells = <0>;
> +                       compatible = "allwinner,sun50i-h6-spdif";
> +                       reg = <0x05093000 0x400>;
> +                       interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
> +                       clocks = <&ccu CLK_BUS_SPDIF>, <&ccu CLK_SPDIF>;
> +                       clock-names = "apb", "spdif";
> +                       resets = <&ccu RST_BUS_SPDIF>;
> +                       dmas = <&dma 2>;
> +                       dma-names = "tx";
> +                       pinctrl-names = "default";
> +                       pinctrl-0 = <&spdif_tx_pin>;
> +                       status = "disabled";
> +               };
> +
>                 usb2otg: usb@...0000 {
>                         compatible = "allwinner,sun50i-h6-musb",
>                                      "allwinner,sun8i-a33-musb";
> --
> 2.20.1
>
> --
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