linux-kernel - Re: [linux-sunxi] Re: [PATCH v2] arm64: allwinner: a64: Add initial NanoPi A64 support

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Date:   Fri, 9 Jun 2017 19:36:56 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Andre Przywara <andre.przywara@....com>, jagan@...nedev.com,
        Jagan Teki <jagannadh.teki@...il.com>
Cc:     maxime.ripard@...e-electrons.com,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        linux-sunxi@...glegroups.com, Sean Wang <sean.wang@...iatek.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel@...ts.infradead.org,
        Icenowy Zheng <icenowy@...c.io>
Subject: Re: [linux-sunxi] Re: [PATCH v2] arm64: allwinner: a64: Add initial
 NanoPi A64 support

Hi,

Am 09.06.2017 um 17:36 schrieb Andre Przywara:
> On 09/06/17 16:26, Jagan Teki wrote:
>> On Friday 09 June 2017 08:21 PM, Maxime Ripard wrote:
>>> On Fri, Jun 09, 2017 at 12:40:52PM +0000, Jagan Teki wrote:
>>>> +&uart1 {
>>>> +    pinctrl-names = "default";
>>>> +    pinctrl-0 = <&uart1_pins>, <&uart1_rts_cts_pins>;
>>>> +    status = "okay";
>>>> +};
>>>
>>> And [what is connected] on that UART?
>>
>> uart1 for SDIO (Wifi connector, with RTS/CTS), this along with mmc1
> 
> To be precise, UART1 (with h/w handshake) is connected to the Bluetooth
> part of the WiFi/BT chip, which is soldered on that board. Regardless of
> the actual *WiFi* support state BT should work already - at least it did
> when I tried this a few months ago on the Pine64 (although this involved
> some userland heavy lifting).
> Not sure what the approach here is in regard to the power supply and
> wake-up GPIOs, shall they be described in this node as well or is that
> up for userspace to control?

You should use a serdev based Bluetooth driver by adding a sub-node, and
it should take care of any reset GPIOs etc. for you. Question is which
driver is needed here and what state it is in.

Regards,
Andreas

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