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Date: Wed, 11 Aug 2021 07:21:08 +0800 From: Art Nikpal <email2tema@...il.com> To: Neil Armstrong <narmstrong@...libre.com> Cc: Jerome Brunet <jbrunet@...libre.com>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, Christian Hewitt <christianshewitt@...il.com>, Artem Lapkin <art@...das.com>, Nick Xie <nick@...das.com>, Gouwa Wang <gouwa@...das.com> Subject: Re: [PATCH 1/2] arm64: dts: meson: add spdif out to khadas-vim > AFAIK the board doesn't have a physical SPDIF output, but one of the 40pin header can output SPDIF, right ? Yes it's right >In this case, following the other boards mainline definitions, we do not enable any function by default For pins on the 40pin (or other programmable) headers. ok ! now i'm understand reason But maybe it is possible to add this area as commented /* */ and users will have possibilities to uncomment it. > DT overlays Yes but I still don't understand how-to apply dt overlays for EFI+grub may be somebody can clarify this problem? On Tue, Aug 10, 2021 at 3:55 PM Neil Armstrong <narmstrong@...libre.com> wrote: > > Hi, > > On 10/08/2021 06:16, Artem Lapkin wrote: > > Add spdif output audio support to khadas-vim > > > > Signed-off-by: Artem Lapkin <art@...das.com> > > --- > > .../dts/amlogic/meson-gxl-s905x-khadas-vim.dts | 17 +++++++++++++++++ > > 1 file changed, 17 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts > > index 60feac0179c0..01f13822a616 100644 > > --- a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts > > +++ b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-khadas-vim.dts > > @@ -64,6 +64,13 @@ hdmi_connector_in: endpoint { > > }; > > }; > > > > + spdif_dit: audio-codec-0 { > > + #sound-dai-cells = <0>; > > + compatible = "linux,spdif-dit"; > > + status = "okay"; > > + sound-name-prefix = "DIT"; > > + }; > > + > > sound { > > compatible = "amlogic,gx-sound-card"; > > model = "KHADAS-VIM"; > > @@ -97,11 +104,21 @@ codec-0 { > > sound-dai = <&hdmi_tx>; > > }; > > }; > > + > > + dai-link-3 { > > + sound-dai = <&aiu AIU_CPU CPU_SPDIF_ENCODER>; > > + > > + codec-0 { > > + sound-dai = <&spdif_dit>; > > + }; > > + }; > > }; > > }; > > > > &aiu { > > status = "okay"; > > + pinctrl-0 = <&spdif_out_h_pins>; > > + pinctrl-names = "default"; > > }; > > > > &cec_AO { > > > > AFAIK the board doesn't have a physical SPDIF output, but one of the 40pin header can output SPDIF, right ? > > In this case, following the other boards mainline definitions, we do not enable any function by default > for pins on the 40pin (or other programmable) headers. > > There is still ongoing discussions on how to handle that on a more generic level, but you should write a bunch > of DT overlays for the VIM boards to enable optional functions like SPDIF and store then in a public git > tree for everybody to use (like armbian or LibreELEC for example) from the U-Boot stage. > > Neil
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