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Date: Wed, 09 Jun 2010 23:22:32 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel@...r.kernel.org, jeremy.kerr@...onical.com,
devicetree-discuss@...ts.ozlabs.org, ben-linux@...ff.org,
linux-i2c@...r.kernel.org
Subject: [PATCH 1/2] 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: Grant Likely <grant.likely@...retlab.ca>
---
drivers/i2c/busses/i2c-cpm.c | 3 ++-
drivers/i2c/busses/i2c-ibm_iic.c | 3 ++-
drivers/i2c/busses/i2c-mpc.c | 3 ++-
drivers/of/Kconfig | 2 +-
drivers/of/of_i2c.c | 44 ++++++++++++++++++++++++--------------
include/linux/of_i2c.h | 13 +++++++++--
6 files changed, 45 insertions(+), 23 deletions(-)
diff --git a/drivers/i2c/busses/i2c-cpm.c b/drivers/i2c/busses/i2c-cpm.c
index b02b453..03ae62e 100644
--- a/drivers/i2c/busses/i2c-cpm.c
+++ b/drivers/i2c/busses/i2c-cpm.c
@@ -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:
diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index bf34413..d964121 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -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;
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index df00eb1..d2e26d2 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -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;
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 097f42a..80dd631 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -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
diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
index ab6522c..e05f9a1 100644
--- a/drivers/of/of_i2c.c
+++ b/drivers/of/of_i2c.c
@@ -14,34 +14,49 @@
#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.irq = irq_of_parse_and_map(node, 0);
info.of_node = node;
info.archdata = &dev_ad;
@@ -49,10 +64,8 @@ void of_register_i2c_devices(struct i2c_adapter *adap,
result = i2c_new_device(adap, &info);
if (result == NULL) {
- printk(KERN_ERR
- "of-i2c: Failed to load driver for %s\n",
- info.type);
- irq_dispose_mapping(info.irq);
+ dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
+ node->full_name);
continue;
}
@@ -64,7 +77,7 @@ void of_register_i2c_devices(struct i2c_adapter *adap,
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)
{
@@ -76,8 +89,7 @@ struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
{
struct device *dev;
- dev = bus_find_device(&i2c_bus_type, NULL, node,
- of_dev_node_match);
+ dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
if (!dev)
return NULL;
diff --git a/include/linux/of_i2c.h b/include/linux/of_i2c.h
index 34974b5..0efe8d4 100644
--- a/include/linux/of_i2c.h
+++ b/include/linux/of_i2c.h
@@ -12,12 +12,19 @@
#ifndef __LINUX_OF_I2C_H
#define __LINUX_OF_I2C_H
+#if defined(CONFIG_OF_I2C) || defined(CONFIG_OF_I2C_MODULE)
#include <linux/i2c.h>
-void of_register_i2c_devices(struct i2c_adapter *adap,
- struct device_node *adap_node);
+extern void of_i2c_register_devices(struct i2c_adapter *adap);
/* must call put_device() when done with returned i2c_client device */
-struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
+extern struct i2c_client *of_find_i2c_device_by_node(struct device_node *node);
+
+#else
+static inline void of_i2c_register_devices(struct i2c_adapter *adap)
+{
+ return;
+}
+#endif /* CONFIG_OF_I2C */
#endif /* __LINUX_OF_I2C_H */
--
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