linux-kernel - Re: [RFC PATCH v3 9/9] ipu3-cio2: Add functionality allowing software_node connections to sensors on platforms designed for Windows

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Date:   Fri, 23 Oct 2020 11:06:43 +0100
From:   Dan Scally <djrscally@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linus.walleij@...aro.org, prabhakar.mahadev-lad.rj@...renesas.com,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        laurent.pinchart+renesas@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Rob Herring <robh@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tian Shu Qiu <tian.shu.qiu@...el.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Yong Zhi <yong.zhi@...el.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tsuchiya Yuto <kitakar@...il.com>, dan.carpenter@...cle.org
Subject: Re: [RFC PATCH v3 9/9] ipu3-cio2: Add functionality allowing
 software_node connections to sensors on platforms designed for Windows

On 22/10/2020 14:40, Andy Shevchenko wrote:
> On Thu, Oct 22, 2020 at 3:59 PM Daniel Scally <djrscally@...il.com> wrote:
>> On 20/10/2020 10:41, Andy Shevchenko wrote:
> ...
>
>>>> +static const char * const port_names[] = {
>>>> +    "port0", "port1", "port2", "port3"
>>> + comma.
>> I think 4 ports is the maximum for CIO2 device, so this shouldn't ever
>> get extended?
> It's better for at least teaching purposes (if anybody takes this
> driver as an example for anything) if you have really believe that no
> new generation will have more than that.

Yeah fair point - it's added


>>>> +    if (is_software_node(dev_fwnode(&pci_dev->dev)))
>>> Can we use the same check as for _build call above?
>> And just set a flag in struct cio2? sure.
> I meant can we use exact conditional w/o any additional flags added?
Oh I see. Erm...I can't think of a way to do that immediately; checking
for the fwnode graph's presence will of course pass if it's defined in
ACPI too. Let me think about it