linux-kernel - Re: [PATCH v2] arm64: dts: meson-gxbb: nanopi-k2: Enable Bluetooth

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Date:   Tue, 4 May 2021 22:52:35 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Chen-Yu Tsai <wens@...nel.org>
Cc:     Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: meson-gxbb: nanopi-k2: Enable Bluetooth

Hi,

On Tue, May 4, 2021 at 6:17 AM Chen-Yu Tsai <wens@...nel.org> wrote:
>
> From: Chen-Yu Tsai <wens@...e.org>
>
> The NanoPi K2 has a AP6212 WiFi+BT combo module. The WiFi portion is
> already enabled. The BT part is connected via UART and I2S.
>
> Enable the UART and add a device node describing the Bluetooth portion
> of the module.
>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
> Changes since v1:
>   - added uart-has-rtscts property
>   - added alias for uart_A
>
> Hi Neil, Martin,
>
> I dropped your review-bys since I added the UART alias and I'm not sure
> what the policy for those are.
>
> ChenYu
> ---
>  .../boot/dts/amlogic/meson-gxbb-nanopi-k2.dts      | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
> index 7273eed5292c..f017a263784f 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-nanopi-k2.dts
> @@ -15,6 +15,7 @@ / {
>
>         aliases {
>                 serial0 = &uart_AO;
> +               serial1 = &uart_A;
this should not be needed anymore since
a26988e8fef4b258d1b771e0f4b2e3b67cb2e044 ("tty: serial: meson: if no
alias specified use an available id")

IIRC for "newly added" .dts we are only adding the alias for anything
that shows up in /dev/ for the user
meson-khadas-vim3.dtsi for example is not adding an alias for uart_A
(also used for Bluetooth)


Best regards,
Martin