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Subject: Re: Question about SC16IS752 device tree.
From:   "H. Nikolaus Schaller" <hns@goldelico.com>
In-Reply-To: <04bd0853-7e34-5210-f1b5-f3ea8c35e484@wanyeetech.com>
Date:   Mon, 9 May 2022 22:19:36 +0200
Cc:     Paul Cercueil <paul@crapouillou.net>, jringle@gridpoint.com,
        shc_work@mail.ru, Rob Herring <robh@kernel.org>,
        Paul Boddie <paul@boddie.org.uk>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        linux-serial@vger.kernel.org,
        linux-mips <linux-mips@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Message-Id: <501852E6-6934-4BB2-850C-B53A07580568@goldelico.com>
References: <7c89db86-4055-90b5-6a67-611410f5759f@wanyeetech.com>
 <ZYNMBR.VDVV3VHFQBMO1@crapouillou.net>
 <04bd0853-7e34-5210-f1b5-f3ea8c35e484@wanyeetech.com>
To:     Zhou Yanjie <zhouyanjie@wanyeetech.com>
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Hi,

> Am 09.05.2022 um 20:41 schrieb Zhou Yanjie =
<zhouyanjie@wanyeetech.com>:
>=20
> Hi Paul,
>=20
> On 2022/5/10 =E4=B8=8A=E5=8D=882:13, Paul Cercueil wrote:
>> I can't say for sure that it's your problem, but your bluetooth nodes =
are missing "reg" properties.=20
>=20
>=20
> Unfortunately it doesn't seem to be the problem here, I added "reg" =
and
> the problem persists, and I've looked at other device trees that =
contain
> "brcm,bcm43438-bt", none of them use "reg", and "reg" is not mentioned =
in
> neither "Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt" =
nor
> "Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml".

what happens if you remove the serdev children from DTS? Does the driver =
create two separate /dev/tty ports? And do they work?

Maybe the sc16is752 driver does not separate them for child nodes, i.e. =
while "reg" should be added it may not be handled?

BR,
Nikolaus