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Commit 9fd04992 authored by Grant Likely's avatar Grant Likely
Browse files

of/i2c: Generalize OF support 



This patch cleans up the i2c OF support code to make it selectable by
all architectures and allow for automatic registration of i2c devices.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 4f0ddcb0

drivers/i2c/busses/i2c-cpm.c

+2 −1
Original line number Diff line number Diff line
@@ -652,6 +652,7 @@ static int __devinit cpm_i2c_probe(struct of_device *ofdev, 
	cpm->adap = cpm_ops;

	i2c_set_adapdata(&cpm->adap, cpm);

	cpm->adap.dev.parent = &ofdev->dev;

	cpm->adap.dev.of_node = of_node_get(ofdev->dev.of_node);



	result = cpm_i2c_setup(cpm);

	if (result) {
@@ -679,7 +680,7 @@ static int __devinit cpm_i2c_probe(struct of_device *ofdev, 
	/*

	 * register OF I2C devices

	 */

	of_register_i2c_devices(&cpm->adap, ofdev->dev.of_node);

	of_i2c_register_devices(&cpm->adap);



	return 0;

out_shut:

drivers/i2c/busses/i2c-ibm_iic.c

+2 −1
Original line number Diff line number Diff line
@@ -745,6 +745,7 @@ static int __devinit iic_probe(struct of_device *ofdev, 
	/* Register it with i2c layer */

	adap = &dev->adap;

	adap->dev.parent = &ofdev->dev;

	adap->dev.of_node = of_node_get(np);

	strlcpy(adap->name, "IBM IIC", sizeof(adap->name));

	i2c_set_adapdata(adap, dev);

	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
@@ -761,7 +762,7 @@ static int __devinit iic_probe(struct of_device *ofdev, 
		 dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");



	/* Now register all the child nodes */

	of_register_i2c_devices(adap, np);

	of_i2c_register_devices(adap);



	return 0;

drivers/i2c/busses/i2c-mpc.c

+2 −1
Original line number Diff line number Diff line
@@ -600,13 +600,14 @@ static int __devinit fsl_i2c_probe(struct of_device *op, 
	i2c->adap = mpc_ops;

	i2c_set_adapdata(&i2c->adap, i2c);

	i2c->adap.dev.parent = &op->dev;

	i2c->adap.dev.of_node = of_node_get(op->dev.of_node);



	result = i2c_add_adapter(&i2c->adap);

	if (result < 0) {

		dev_err(i2c->dev, "failed to add adapter\n");

		goto fail_add;

	}

	of_register_i2c_devices(&i2c->adap, op->dev.of_node);

	of_i2c_register_devices(&i2c->adap);



	return result;

drivers/of/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ config OF_GPIO 


config OF_I2C

	def_tristate I2C

	depends on (PPC_OF || MICROBLAZE) && I2C

	depends on OF && !SPARC && I2C

	help

	  OpenFirmware I2C accessors

drivers/of/of_i2c.c

+29 −21
Original line number Diff line number Diff line
@@ -14,57 +14,65 @@ 
#include <linux/i2c.h>

#include <linux/of.h>

#include <linux/of_i2c.h>

#include <linux/of_irq.h>

#include <linux/module.h>



void of_register_i2c_devices(struct i2c_adapter *adap,

			     struct device_node *adap_node)

void of_i2c_register_devices(struct i2c_adapter *adap)

{

	void *result;

	struct device_node *node;



	for_each_child_of_node(adap_node, node) {

	/* Only register child devices if the adapter has a node pointer set */

	if (!adap->dev.of_node)

		return;



	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");



	for_each_child_of_node(adap->dev.of_node, node) {

		struct i2c_board_info info = {};

		struct dev_archdata dev_ad = {};

		const __be32 *addr;

		int len;



		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)

		dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);



		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {

			dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",

				node->full_name);

			continue;

		}



		addr = of_get_property(node, "reg", &len);

		if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {

			printk(KERN_ERR

			       "of-i2c: invalid i2c device entry\n");

		if (!addr || (len < sizeof(int))) {

			dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",

				node->full_name);

			continue;

		}



		info.irq = irq_of_parse_and_map(node, 0);



		info.addr = be32_to_cpup(addr);

		if (info.addr > (1 << 10) - 1) {

			dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",

				info.addr, node->full_name);

			continue;

		}



		info.of_node = node;

		info.irq = irq_of_parse_and_map(node, 0);

		info.of_node = of_node_get(node);

		info.archdata = &dev_ad;



		request_module("%s", info.type);



		result = i2c_new_device(adap, &info);

		if (result == NULL) {

			printk(KERN_ERR

			       "of-i2c: Failed to load driver for %s\n",

			       info.type);

			dev_err(&adap->dev, "of_i2c: Failure registering %s\n",

			        node->full_name);

			of_node_put(node);

			irq_dispose_mapping(info.irq);

			continue;

		}



		/*

		 * Get the node to not lose the dev_archdata->of_node.

		 * Currently there is no way to put it back, as well as no

		 * of_unregister_i2c_devices() call.

		 */

		of_node_get(node);

	}

}

EXPORT_SYMBOL(of_register_i2c_devices);

EXPORT_SYMBOL(of_i2c_register_devices);



static int of_dev_node_match(struct device *dev, void *data)

{