linux-kernel - [PATCH 2/3] mfd: link vx855 with device tree

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Date:	Wed, 28 Sep 2011 10:08:26 +0100 (BST)
From:	Daniel Drake <dsd@...top.org>
To:	grant.likely@...retlab.ca
Cc:	broonie@...nsource.wolfsonmicro.com
Subject: [PATCH 2/3] mfd: link vx855 with device tree

Set the of_node of the mfd device, and use it to assign the of_node
of the child gpio cell. The child driver will then pass the handle to
gpiolib, which enables device-tree-probed gpio-leds and more.

Signed-off-by: Daniel Drake <dsd@...top.org>
---
 drivers/mfd/vx855.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/vx855.c b/drivers/mfd/vx855.c
index d698703..d223840 100644
--- a/drivers/mfd/vx855.c
+++ b/drivers/mfd/vx855.c
@@ -30,6 +30,7 @@
 #include <linux/platform_device.h>
 #include <linux/pci.h>
 #include <linux/mfd/core.h>
+#include <linux/of.h>
 
 /* offset into pci config space indicating the 16bit register containing
  * the power management IO space base */
@@ -72,6 +73,27 @@ static struct mfd_cell vx855_cells[] = {
 	},
 };
 
+static __devinit void vx855_set_of_nodes(struct pci_dev *pdev)
+{
+#ifdef CONFIG_OF
+	struct device_node *isa_node;
+	struct device_node *child;
+
+	isa_node = of_find_compatible_node(NULL, NULL, "via,vx855-isa");
+	pdev->dev.of_node = isa_node;
+
+	if (!isa_node)
+		return;
+
+	for_each_child_of_node(isa_node, child) {
+		if (of_device_is_compatible(child, "via,vx855-gpio")) {
+			vx855_cells[0].of_node = child;
+			break;
+		}
+	}
+#endif
+}
+
 static __devinit int vx855_probe(struct pci_dev *pdev,
 				 const struct pci_device_id *id)
 {
@@ -90,6 +112,8 @@ static __devinit int vx855_probe(struct pci_dev *pdev,
 		goto out;
 	}
 
+	vx855_set_of_nodes(pdev);
+
 	/* mask out the lowest seven bits, as they are always zero, but
 	 * hardware returns them as 0x01 */
 	gpio_io_offset &= 0xff80;
-- 
1.7.6.2

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