linux-kernel - Re: [RFC PATCH v3 7/9] ipu3-cio2: Check if pci_dev->dev's fwnode is a software_node in cio2_parse_firmware() and set FWNODE_GRAPH_DEVICE

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Date:   Tue, 20 Oct 2020 15:06:15 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux.walleij@...aro.org,
        prabhakar.mahadev-lad.rj@...renesas.com,
        heikki.krogerus@...ux.intel.com, dmitry.torokhov@...il.com,
        laurent.pinchart+renesas@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com, jacopo+renesas@...ndi.org,
        robh@...nel.org, davem@...emloft.net, linux@...musvillemoes.dk,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        pmladek@...e.com, mchehab@...nel.org, tian.shu.qiu@...el.com,
        bingbu.cao@...el.com, yong.zhi@...el.com, rafael@...nel.org,
        gregkh@...uxfoundation.org, kitakar@...il.com,
        dan.carpenter@...cle.org
Subject: Re: [RFC PATCH v3 7/9] ipu3-cio2: Check if pci_dev->dev's fwnode is
 a software_node in cio2_parse_firmware() and set
 FWNODE_GRAPH_DEVICE_DISABLED if so

Hi Andy,

On Tue, Oct 20, 2020 at 12:19:58PM +0300, Andy Shevchenko wrote:
> On Mon, Oct 19, 2020 at 11:59:01PM +0100, Daniel Scally wrote:
> > fwnode_graph_get_endpoint_by_id() will optionally parse enabled devices
> > only; that status being determined through the .device_is_available() op
> > of the device's fwnode. As software_nodes don't have that operation and
> > adding it is meaningless, we instead need to check if the device's fwnode
> > is a software_node and if so pass the appropriate flag to disable that
> > check
> 
> Period.
> 
> I'm wondering if actually this can be hidden in fwnode_graph_get_endpoint_by_id().

The device availability test is actually there for a reason. Some firmware
implementations put all the potential devices in the tables and only one
(of some) of them are available.

Could this be implemented so that if the node is a software node, then get
its parent and then see if that is available?

I guess that could be implemented in software node ops. Any opinions?

-- 
Kind regards,

Sakari Ailus