linux-kernel - [PATCH] platform: set of_node in platform_device_register

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Message-Id: <20190220113506.11009-1-mans@mansr.com>
Date:   Wed, 20 Feb 2019 11:35:06 +0000
From:   Mans Rullgard <mans@...sr.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] platform: set of_node in platform_device_register_full()

If the provided fwnode is an OF node, set dev.of_node as well.

Some drivers are just shims that create extra "glue" devices with the
DT device as parent and have the real driver bind to these.  In these
cases, the glue device needs to get a reference to the original DT node
in order for the main driver to access properties and child nodes.

For example, the sunxi-musb driver creates such a glue device using
platform_device_register_full().  Consequently, devices attached to
this USB interface don't get associated with DT nodes, if present,
the way they do with EHCI.

This change will allow sunxi-musb and similar driver to easily
propagate the DT node to child devices as required.

Signed-off-by: Mans Rullgard <mans@...sr.com>
---
 drivers/base/platform.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index dff82a3c2caa..853a1d0e5845 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -512,6 +512,7 @@ struct platform_device *platform_device_register_full(

 	pdev->dev.parent = pdevinfo->parent;
 	pdev->dev.fwnode = pdevinfo->fwnode;
+	pdev->dev.of_node = of_node_get(to_of_node(pdev->dev.fwnode));

 	if (pdevinfo->dma_mask) {
 		/*
-- 
2.20.1