linux-kernel - Re: [PATCH 2/2] ARM: dts: sun8i: enable UART1 for iNet D978 Rev2 board

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Date:   Thu, 25 Aug 2016 12:40:57 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: sun8i: enable UART1 for iNet D978 Rev2 board

On Thu, Aug 25, 2016 at 7:58 AM, Icenowy Zheng <icenowy@...c.xyz> wrote:
>
>
> 25.08.2016, 03:36, "Maxime Ripard" <maxime.ripard@...e-electrons.com>:
>> Hi,
>>
>> On Tue, Aug 23, 2016 at 02:44:51PM +0800, Icenowy Zheng wrote:
>>>  UART1 is connected to the bluetooth part of RTL8723BS WiFi/BT combo card
>>>  on iNet D978 Rev2 board.
>>>
>>>  Enable the UART1 to make it possible to use the modified hciattach by
>>>  Realtek to drive the BT part of RTL8723BS.
>>>
>>>  Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
>>
>> I guess you could fold that patch into the previous one.
>>
>>>  ---
>>>   arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts | 11 +++++++++++
>>>   1 file changed, 11 insertions(+)
>>>
>>>  diff --git a/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts b/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
>>>  index 78823d8..3ac22d4 100644
>>>  --- a/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
>>>  +++ b/arch/arm/boot/dts/sun8i-a33-inet-d978-rev2.dts
>>>  @@ -48,6 +48,10 @@
>>>           model = "INet-D978 Rev 02";
>>>           compatible = "primux,inet-d978-rev2", "allwinner,sun8i-a33";
>>>
>>>  + aliases {
>>>  + serial1 = &uart1;
>>>  + };
>>>  +
>>
>> Is there any other UART in the system?
>
> serial0 is defined in sun8i-reference-design-tablet.dtsi, as r_uart.

If your board does not have r_uart pads, then the right thing to do
would be to disable it. You can then have uart1 as serial0.

AFAIK Linux requires a console, but that console can be simplefb.

ChenYu

>>
>> The alias is not supposed to be about the controller index, but the
>> index in the board, meaning that if you only have a single UART, that
>> would be serial0.
>>
>> Thanks!
>> Maxime
>>
>> --
>> Maxime Ripard, Free Electrons
>> Embedded Linux and Kernel engineering
>> http://free-electrons.com