linux-kernel - Re: [PATCH] of/platform: Initialise dev->fwnode appropriately

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Date:   Fri, 16 Sep 2016 12:12:07 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>, frowand.list@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, okaya@...eaurora.org,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com
Subject: Re: [PATCH] of/platform: Initialise dev->fwnode appropriately

On Thu, Sep 15, 2016 at 08:36:57AM -0500, Rob Herring wrote:
> On Wed, Sep 14, 2016 at 04:01:24PM +0100, Robin Murphy wrote:
> > Whilst we're some of the way towards a universal firmware property
> > interface, drivers which deal with both OF and ACPI probing end up
> > having to do things like this:
> > 
> >     dev->of_node ? &dev->of_node->fwnode : dev->fwnode
> > 
> > This seems unnecessary, when the OF code could instead simply fill in
> > the device's fwnode when binding the of_node, and let the drivers use
> > dev->fwnode either way. Let's give it a go and see what falls out.
> > 
> > Signed-off-by: Robin Murphy <robin.murphy@....com>
> > ---
> >  drivers/of/platform.c | 2 ++
> >  1 file changed, 2 insertions(+)
> 
> I've applied this, but what about non-platform devices such as i2c?

Thanks ! Patch below should do for mfd and i2c (to be confirmed) but
I am pretty certain it is still missing some devices, are we going
to convert them on a case-by-case policy (ie when/if needed) ?

Lorenzo

-- >8 --
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index da3a02e..667a393 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1574,6 +1574,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
 
 	info.addr = addr;
 	info.of_node = of_node_get(node);
+	info.fwnode = &node->fwnode;
 	info.archdata = &dev_ad;
 
 	if (of_get_property(node, "wakeup-source", NULL))
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 3ac486a..c264bf5 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -179,6 +179,7 @@ static int mfd_add_device(struct device *parent, int id,
 		for_each_child_of_node(parent->of_node, np) {
 			if (of_device_is_compatible(np, cell->of_compatible)) {
 				pdev->dev.of_node = np;
+				pdev->dev.fwnode = &np->fwnode;
 				break;
 			}
 		}