linux-kernel - Re: [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

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Date:   Mon, 26 Feb 2018 13:15:04 +0000
From:   John Garry <john.garry@...wei.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        <gregkh@...uxfoundation.org>, <jslaby@...e.com>,
        <p.zabel@...gutronix.de>, <heiko@...ech.de>,
        <ed.blake@...drel.com>, <jhogan@...nel.org>
CC:     <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>
Subject: Re: [RFC PATCH 0/2] serial: 8250_dw: IO space + polling mode support

On 26/02/2018 12:27, Andy Shevchenko wrote:
> On Mon, 2018-02-26 at 14:21 +0200, Andy Shevchenko wrote:
>> On Mon, 2018-02-26 at 11:56 +0000, John Garry wrote:
>
>
>>>    Device (LPC0.CON0) {
>>>      Name (_HID, "HISI1031")
>
>>>      // Name (_CID, "PNP0501") // cannot support PNP
>
>
> One more question. What is the problem with this CID? Do you have a race
> condition in enumeration?
>

Hi Andy,

Not sure if race condition exactly. I tried enabling this CID and a pnp 
device is created in pnpacpi_add_device_handler(), while we have already 
marked the corresponding acpi_device to skip enumeration in ACPI scan 
handler (by flagging it as a serial bus slave).

Thanks,
John