linux-kernel - Re: [RFC PATCH] software node: Skip duplicated software

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Message-ID: <CAHp75VebqgAyOz5MYRjdujijhas2iTw3viS1vpXm8RNkBevaMg@mail.gmail.com>
Date:   Tue, 2 Nov 2021 22:20:04 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] software node: Skip duplicated software_node sysfs

On Tue, Nov 2, 2021 at 9:44 PM Qian Cai <quic_qiancai@...cinc.com> wrote:
> On 11/1/21 7:51 PM, Andy Shevchenko wrote:
> > No, it’s not so easy. What you are doing is a papering over the real issue
> > which is the limitation of the firmware nodes to two. What we need is to
> > drop the link from struct fwnode_handle, move it to upper layer and modify
> > all fwnode ops to be used over the list of fwnode:s.
>
> Andy, this is my first time touching fwnode/swnode. After reading the
> source code for a few hours, I still don't understand the hint here.
> Specifically, what does the "the link" refer to?

https://elixir.bootlin.com/linux/latest/source/include/linux/fwnode.h#L36

(Property related) fwnode (as of today) is the single linked list with
only two possible entries. Comments against set_primary_fwnode()
followed by set_secondary_fwnode() may shed a bit of light here
https://elixir.bootlin.com/linux/latest/source/drivers/base/core.c#L4724

-- 
With Best Regards,
Andy Shevchenko