linux-kernel - [PATCH v3 3/4] mfd: mfd-core: reattach mfd of_node to cells without of

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Date:	Tue, 26 Jul 2016 09:43:46 +0200
From:	Quentin Schulz <quentin.schulz@...e-electrons.com>
To:	jdelvare@...e.com, linux@...ck-us.net, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	maxime.ripard@...e-electrons.com, wens@...e.org,
	lee.jones@...aro.org
Cc:	Quentin Schulz <quentin.schulz@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	thomas.petazzoni@...e-electrons.com,
	antoine.tenart@...e-electrons.com
Subject: [PATCH v3 3/4] mfd: mfd-core: reattach mfd of_node to cells without of_compatible

When an MFD cell has an of_compatible (meaning it is present in the Device
Tree), other nodes can reference it using a phandle.

However when the MFD cell is not declared in the Device Tree, the only way
other nodes can reference it are by using a phandle to the MFD. Then when
this MFD cell tries to register itself in one framework, the registration
is denied by the framework because it is not matching the of_node of the
node which is referenced by the phandle in one of the other nodes.

This reattaches the of_node of the MFD to the MFD cell device structure
when the MFD cell has no of_compatible.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---

We need this modification to register the thermal sensor in the thermal
framework.

Added in v3.

 drivers/mfd/mfd-core.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 3ac486a..0b19663 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -175,12 +175,16 @@ static int mfd_add_device(struct device *parent, int id,
 	if (ret < 0)
 		goto fail_res;

-	if (parent->of_node && cell->of_compatible) {
-		for_each_child_of_node(parent->of_node, np) {
-			if (of_device_is_compatible(np, cell->of_compatible)) {
-				pdev->dev.of_node = np;
-				break;
+	if (parent->of_node) {
+		if (cell->of_compatible) {
+			for_each_child_of_node(parent->of_node, np) {
+				if (of_device_is_compatible(np, cell->of_compatible)) {
+					pdev->dev.of_node = np;
+					break;
+				}
 			}
+		} else {
+			pdev->dev.of_node = parent->of_node;
 		}
 	}

-- 
2.5.0