linux-kernel - Re: Question about SC16IS752 device tree.

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Date:   Mon, 9 May 2022 22:19:36 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc:     Paul Cercueil <paul@...pouillou.net>, jringle@...dpoint.com,
        shc_work@...l.ru, Rob Herring <robh@...nel.org>,
        Paul Boddie <paul@...die.org.uk>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-serial@...r.kernel.org,
        linux-mips <linux-mips@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Question about SC16IS752 device tree.

Hi,

> Am 09.05.2022 um 20:41 schrieb Zhou Yanjie <zhouyanjie@...yeetech.com>:
> 
> Hi Paul,
> 
> On 2022/5/10 上午2:13, Paul Cercueil wrote:
>> I can't say for sure that it's your problem, but your bluetooth nodes are missing "reg" properties. 
> 
> 
> 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